Sample records for notice agn notes

  1. AGN Taxonomy and Unification Historical notes

    E-Print Network [OSTI]

    Aretxaga, Itziar

    Lecture 1 AGN Taxonomy and Unification · Historical notes · Multifrequency detection of nuclear activity · Classification of AGN - taxonomy · Unification · Evidence for obscuring tori in AGN Itziar Aretxaga (INAOE) @El Escorial, Dec 2007 #12;AGN taxonomy "Active" is used to refer to energetic processes

  2. Notices

    U.S. Energy Information Administration (EIA) Indexed Site

    24, 2013 Notices Module Shipments Report,'' move into this clearance package to permit EIA to better align its surveys and programs. In addition, EIA's proposed new Form...

  3. Notices

    Energy Savers [EERE]

    Impact Statement AGENCY: U.S. Department of Energy. ACTION: Notice of availability and public hearings. SUMMARY: The U.S. Department of Energy (DOE) announces the availability...

  4. Notices

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Western Area Power Administration, DOE. ACTION: Notice of Extension of Non-Firm Power Formula Rate. SUMMARY: The Western Area Power Administration (Western) extends, on an interim...

  5. Notices

    Broader source: Energy.gov (indexed) [DOE]

    Notices 1 75 FR 66078 (October 10, 2010). 2 The Final EIS can be found on Western's Web site at: http:ww2.wapa.govsitesWestern transmissioninterconnDocumentsricesolar...

  6. Notices

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Friday, February 22, 2013 Notices 1 73 FR 42,565 (July 22, 2008). 2 See U.S. Dept. of Energy, Western Area Power Admin., Docket No. EF08-5161-000, 127 FERC 62,043 (2009)....

  7. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    517 Federal Register Vol. 77, No. 38 Monday, February 27, 2012 Notices Issued at Washington, DC, on February 21, 2012. LaTanya R. Butler, Acting Deputy Committee Management...

  8. Notices

    Energy Savers [EERE]

    511 Federal Register Vol. 79, No. 124 Friday, June 27, 2014 Notices interventions in lieu of paper using the ''eFiling'' link at http:www.ferc.gov. Persons unable to file...

  9. Notices

    U.S. Energy Information Administration (EIA) Indexed Site

    362 Federal Register Vol. 77, No. 51 Thursday, March 15, 2012 Notices telephone (TTY), call the Federal Relay Service (FRS), toll free, at 1-800-877- 8339. Individuals with...

  10. Notices

    Energy Savers [EERE]

    000 Federal Register Vol. 80, No. 58 Thursday, March 26, 2015 Notices 1 American LNG states that the Hialeah Facility is being constructed, and will be owned and operated, by...

  11. Notices

    Broader source: Energy.gov (indexed) [DOE]

    Register Vol. 79, No. 156 Wednesday, August 13, 2014 Notices 1 See Freeport LNG Expansion, L.P., et al., DOE FE Order Nos. 3282-B, 3357-A, Docket Nos. 10- 161-LNG,...

  12. Notices

    Broader source: Energy.gov (indexed) [DOE]

    Federal Register Vol. 79, No. 180 Wednesday, September 17, 2014 Notices 1 Alaska LNG states that the conversion factor of 46.467 Bcf per million metric ton is appropriate...

  13. Notices

    National Nuclear Security Administration (NNSA)

    9 Federal Register Vol. 76, No. 2 Tuesday, January 4, 2011 Notices quarter of the Northeast quarter of said Section 8; thence South 191.0 feet; thence East 228.0 feet; thence...

  14. Notices

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    FR Doc. 2013-31220 Filed 12-27-13; 8:45 am BILLING CODE 6450-01-P FEDERAL COMMUNICATIONS COMMISSION Notice of Public Information Collection(s) Being Reviewed by the...

  15. Infrared Surveys for AGN

    E-Print Network [OSTI]

    Harding E. Smith

    2002-03-06T23:59:59.000Z

    From the earliest extragalactic infrared studies AGN have shown themselves to be strong infrared sources and IR surveys have revealed new populations of AGN. I briefly review current motivations for AGN surveys in the infrared and results from previous IR surveys. The Luminous Infrared Galaxies, which in some cases house dust-enshrouded AGN, submillimeter surveys, and recent studies of the cosmic x-ray and infrared backgrounds suggest that there is a population of highly-obscured AGN at high redshift. ISO Surveys have begun to resolve the infrared background and may have detected this obscured AGN population. New infrared surveys, particularly the SIRTF Wide-area Infrared Extragalactic Legacy Survey (SWIRE), will detect this population and provide a platform for understanding the evolution of AGN, Starbursts and passively evolving galaxies in the context of large-scale structure and environment.

  16. Notices

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated CodesTransparencyDOE Project TapsDOE Directives, Delegations,Notice to

  17. Notices

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated CodesTransparencyDOE Project TapsDOE Directives, Delegations,Notice to843

  18. Notices

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated CodesTransparencyDOE Project TapsDOE Directives, Delegations,Notice to84336

  19. Notices

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated CodesTransparencyDOE Project TapsDOE Directives, Delegations,Notice

  20. Notices

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated CodesTransparencyDOE Project TapsDOE Directives, Delegations,Notice424

  1. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the.pdfBreaking ofOilNEW HAMPSHIREofNewsletterEnergy HeatingElectricMay3627 Federal32

  2. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the.pdfBreaking ofOilNEW HAMPSHIREofNewsletterEnergy HeatingElectricMay3627 Federal32795

  3. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the.pdfBreaking ofOilNEW HAMPSHIREofNewsletterEnergy HeatingElectricMay3627

  4. Infrared Emission from AGN

    E-Print Network [OSTI]

    D. B. Sanders

    1999-03-30T23:59:59.000Z

    Infrared observations of complete samples of active galactic nuclei (AGN) have shown that a substantial fraction of their bolometric luminosity is emitted at wavelengths ~8-1000microns. In radio-loud and Blazar-like objects much of this emission appears to be direct non-thermal synchrotron radiation. However, in the much larger numbers of radio-quiet AGN it is now clear that thermal dust emission is responsible for the bulk of radiation from the near-infrared through submillimeter wavelengths. Luminous infrared-selected AGN are often surrounded by powerful nuclear starbursts, both of which appear to be fueled by enormous supplies of molecular gas and dust funneled into the nuclear region during the strong interaction/merger of gas rich disks. All-sky surveys in the infrared show that luminous infrared AGN are at least as numerous as optically-selected AGN of comparable bolometric luminosity, suggesting that AGN may spend a substantial fraction of their lifetime in a dust-enshrouded phase. The space density of luminous infrared AGN at high redshift may be sufficient to account for much of the X-Ray background, and for a substantial fraction of the far-infrared background as well. These objects plausibly represent a major epoch in the formation of spheroids and massive black holes (MBH).

  5. Intrinsic AGN Absorption Lines

    E-Print Network [OSTI]

    Fred Hamann

    2000-06-12T23:59:59.000Z

    Strong absorption lines are common in rest-frame UV spectra of AGNs due to a variety of resonant transitions, for example the HI Lyman series lines (most notably Ly-alpha 1216) and high-ionization doublets like CIV 1549,1551. The lines are called ``intrinsic'' if the absorbing gas is physically related to the AGN, e.g. if the absorber resides broadly within the radius of the AGN's surrounding ``host'' galaxy. Intrinsic absorption lines are thus valuable probes of the kinematics, physical conditions and elemental abundances in the gas near AGNs. Studies of intrinsic absorbers have historically emphasized the broad absorption lines (BALs) in quasars. Today we recognize a wider variety of intrinsic lines in a wider range of objects. For example, we now know that Seyfert 1 galaxies (the less luminous cousins of quasars) have intrinsic absorption. We also realize that intrinsic lines can form in a range of AGN environments --- from the dynamic inner regions like the BALs, to the more quiescent outer host galaxies >10 kpc away. This article provides a brief introduction to current observational and theoretical work on intrinsic AGN absorbers.

  6. Note: Within nine months of the publication of the mention of the grant of the European patent in the European Patent Bulletin, any person may give notice to the European Patent Office of opposition to that patent, in accordance with the

    E-Print Network [OSTI]

    Hubin, Tim

    Note: Within nine months of the publication of the mention of the grant of the European patent in the European Patent Bulletin, any person may give notice to the European Patent Office of opposition to that patent, in accordance with the Implementing Regulations. Notice of opposition shall not be deemed to have

  7. Agnes Houser | Y-12 National Security Complex

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Agnes Houser Agnes Houser Oral History Videos Speakers INTRODUCTION Ed Bailey Jim Bailey Kay Bailey Ken Bernander Willard Brock Wilma Brooks Elmer Brummitt Naomi Brummitt Blake...

  8. Fueling the AGN

    E-Print Network [OSTI]

    F. Combes

    2000-10-27T23:59:59.000Z

    Active Galactic Nuclei are fueled from material (gas or stars) that are in general far away from the gravitational influence of the central black hole, the engine thought to be responsible for their activity. The required material has a lot of angular momentum, that is a priori quite difficult to evacuate. The various dynamical mechanisms that may play a role in this game are reviewed, including m=2 perturbations (bars and spirals), m=1 perturbations (spirals, warps, lopsidedness), and tidal interactions between galaxies and mergers. In the latest stages of the merger, a binary black hole could be formed, and its influence on the dynamics and fueling is discussed. Starbursts are often associated with AGN, and the nature of their particular connection, and their role in the nuclear fueling is described. Evolution of the fueling efficiency with redshift is addressed.

  9. Extinction curves in AGN

    E-Print Network [OSTI]

    B. Czerny

    2006-12-16T23:59:59.000Z

    The presence of the dust in the circumnuclear region strongly affects our view of the nucleus itself. The effect is strong in type 2 objects but weaker effect is likely to be present in type 1 objects as well. In these objects a correction to the observed optical/UV spectrum must be done in order to recover the intrinsic spectrum of a nucleus. The approach based on the extinction curve is convenient for that purpose so significant effort has been recently done in order to determine the extinction curve for the circumnuclear material. It seems clear that the circumnuclear dust is different from the average properties of the dust in the Interstellar Medium in our galaxy: the well known 2175 A feature is weak or absent in AGN nuclear dust, and the extinction curve at shorter wavelength does not seem to be rising as steeply. The circumnuclear dust is therefore more similar to SMC dust, or more likely, to the dust in very dense molecular clouds in our Galaxy. However, the exact shape of the extinction curve in the far UV is still a matter of debate, and various effects are difficult to disentangle.

  10. Fuelling starbursts and AGN

    E-Print Network [OSTI]

    Johan H. Knapen

    2004-07-03T23:59:59.000Z

    There is considerable evidence that the circumnuclear regions of galaxies are intimately related to their host galaxies, most directly through their bars. There is also convincing evidence for relations between the properties of supermassive black holes in the nuclei of galaxies and those of their host galaxy. It is much less clear, however, how stellar (starburst) and non-stellar (AGN) activity in the nuclear regions can be initiated and fuelled. I review gas transport from the disk to the nuclear and circumnuclear regions of galaxies, as well as the statistical relationships between the occurrence of nuclear activity and mechanisms which can cause central gas concentration, in particular bars and interactions. There are strong indications from theory and modelling for bar-induced central gas concentration, accompanied by limited observational evidence. Bars are related to activity, but this is only a weak statistical effect in the case of Seyferts, whereas the relation is limited to specific cases in starbursts. There is no observational evidence for a statistical connection between interactions and activity in Seyferts, and some evidence for this in starbursts, but probably limited to the extremes, e.g., ULIRGs. Some interesting hints at relations between rings, including nuclear rings, and the presence of nuclear activity are emerging. It is likely that the connection between the inflow of gaseous fuel from the disk of a galaxy on the one hand and the activity in its nuclear region on the other is not as straightforward as sometimes suggested, because the spatial- or time-scales concerned may be significantly different.

  11. AGN Heating through Cavities and Shocks

    E-Print Network [OSTI]

    P. E. J. Nulsen; C. Jones; W. R. Forman; L. P. David; B. R. McNamara; D. A. Rafferty; L. Birzan; M. W. Wise

    2006-11-04T23:59:59.000Z

    Three comments are made on AGN heating of cooling flows. A simple physical argument is used to show that the enthalpy of a buoyant radio lobe is converted to heat in its wake. Thus, a significant part of ``cavity'' enthalpy is likely to end up as heat. Second, the properties of the repeated weak shocks in M87 are used to argue that they can plausibly prevent gas close to the AGN from cooling. As the most significant heating mechanism at work closest to the AGN, shock heating probably plays a critical role in the feedback mechanism. Third, results are presented from a survey of AGN heating rates in nearby giant elliptical galaxies. With inactive systems included, the overall AGN heating rate is reasonably well matched to the total cooling rate for the sample. Thus, intermittent AGN outbursts are energetically capable of preventing the hot atmospheres of these galaxies from cooling and forming stars.

  12. AGN Physics from QSO Clustering

    E-Print Network [OSTI]

    Scott Croom; Brian Boyle; Tom Shanks; Phil Outram; Robert Smith; Lance Miller; Nicola Loaring; Suzanne Kenyon; Warrick Couch

    2003-10-20T23:59:59.000Z

    We review the current status of QSO clustering measurements, particular with respect to their relevance in understanding AGN physics. Measurements based on the 2dF QSO Redshift Survey (2QZ) find a scale length for QSO clustering of s_0=5.76(+0.17-0.27) h-1 Mpc at a redshift ~1.5, very similar to low redshift galaxies. There is no evidence of evolution in the clustering of QSOs from z~0.5 to z~2.2. This lack of evolution and low clustering amplitude suggests a short life time for AGN activity of the order ~10^6-10^7 years. Large surveys such at the 2QZ and SDSS also allow the the study of QSO environments in 3D for the first time (at least at low redshift), early results from this work seem to show no difference between the environments of QSOs and normal galaxies. Future studies e.g. measuring clustering as a function of black hole mass, and deep QSO surveys should provide further insight into the formation and evolution of AGN.

  13. Testing neutrino magnetic moments with AGNs

    E-Print Network [OSTI]

    Kari Enqvist; Petteri Keränen; Jukka Maalampi

    1998-06-17T23:59:59.000Z

    We propose to test the magnetic transition moments of Majorana neutrinos by comparing the fluxes of different flavours of neutrinos coming from active galactic nuclei (AGN). We show that, with reasonable assumptions about the magnetic field of the AGN, it is possible to obtain limits on $\

  14. The 60-month all-sky BAT Survey of AGN and the Anisotropy of Nearby AGN

    SciTech Connect (OSTI)

    Ajello, M.; /KIPAC, Menlo Park; Alexander, D.M.; /Durham U.; Greiner, J.; /Garching, Max Planck Inst., MPE; Madejski, G.M.; /KIPAC, Menlo Park; Gehrels, N.; /NASA, Goddard; Burlon, D.; /Garching, Max Planck Inst., MPE

    2012-04-02T23:59:59.000Z

    Surveys above 10 keV represent one of the the best resources to provide an unbiased census of the population of Active Galactic Nuclei (AGN). We present the results of 60 months of observation of the hard X-ray sky with Swift/BAT. In this timeframe, BAT detected (in the 15-55 keV band) 720 sources in an all-sky survey of which 428 are associated with AGN, most of which are nearby. Our sample has negligible incompleteness and statistics a factor of {approx}2 larger over similarly complete sets of AGN. Our sample contains (at least) 15 bona-fide Compton-thick AGN and 3 likely candidates. Compton-thick AGN represent a {approx}5% of AGN samples detected above 15 keV. We use the BAT dataset to refine the determination of the LogN-LogS of AGN which is extremely important, now that NuSTAR prepares for launch, towards assessing the AGN contribution to the cosmic X-ray background. We show that the LogN-LogS of AGN selected above 10 keV is now established to a {approx}10% precision. We derive the luminosity function of Compton-thick AGN and measure a space density of 7.9{sub -2.9}{sup +4.1} x 10{sup -5} Mpc{sup -3} for objects with a de-absorbed luminosity larger than 2 x 10{sup 42} erg s{sup -1}. As the BAT AGN are all mostly local, they allow us to investigate the spatial distribution of AGN in the nearby Universe regardless of absorption. We find concentrations of AGN that coincide spatially with the largest congregations of matter in the local ({le} 85 Mpc) Universe. There is some evidence that the fraction of Seyfert 2 objects is larger than average in the direction of these dense regions.

  15. AGN Activity in Giant LSB Galaxies

    E-Print Network [OSTI]

    James Schombert

    1998-06-30T23:59:59.000Z

    A search of large, HI-rich disk galaxies finds a significantly higher fraction of low luminosity AGN signatures compared to other late-type galaxies. Approximately half of the galaxies selected in this sample have AGN-like behavior in their cores, the rest have HII nuclei resulting from simple star formation. Since AGN behavior is not evident in all the sample galaxies, which where selected by high gas mass, we speculate that it is the fuel flow rate that is the common feature between late-type LSB disks and other active nuclear galaxies.

  16. Morphology of AGN in the central kiloparsec

    E-Print Network [OSTI]

    Paul Martini

    2001-07-11T23:59:59.000Z

    Hubble Space Telescope observations of the central kiloparsec of AGN have revealed a wealth of structure, particularly nuclear bars and spirals, that are distinct from analogous features in the disks of spiral galaxies. WFPC2 and NICMOS images of a large sample of AGN observed at high spatial resolution make it possible to quantify the frequency and detailed properties of these structures. Nearly all AGN have nuclear spiral dust lanes in the central kiloparsec, while only a small minority contain nuclear bars. If these nuclear dust spirals trace shocks in the circumnuclear, gaseous disks, they may dissipate sufficient angular momentum to fuel the active nucleus.

  17. AGN fueling: the observational point of view

    E-Print Network [OSTI]

    F. Combes

    2002-10-10T23:59:59.000Z

    Observations at multiple wavelengths are reviewed to search for evidence for fueling mechanisms in galaxies, both for nuclear starbursts and AGN activity. Although it is undisputed that dynamical perturbations such as bars or tidal interactions accumulate gas in the central regions and sometimes trigger nuclear starbursts, the evidence remains scarce that these are necessary to fuel AGNs. Interpretations in terms of time-scales, feed-back, and black hole evolution are discussed. It is suggested that the AGN phase corresponds to the early-type phases of galaxies.

  18. Some Comments related to AGN Radio Loudness

    E-Print Network [OSTI]

    Ari Laor

    2003-12-24T23:59:59.000Z

    The bimodality of the AGN radio loudness distribution, and the relation of radio loudness and black hole mass were recently disputed. A closer look at the existing data suggests possible resolutions of these disputes, as further described below.

  19. Gamma-ray emitting AGN and GLAST

    E-Print Network [OSTI]

    P. Padovani

    2007-04-02T23:59:59.000Z

    I describe the different classes of Active Galactic Nuclei (AGN) and the basic tenets of unified schemes. I then review the properties of the extragalactic sources detected in the GeV and TeV bands, showing that the vast majority of them belong to the very rare blazar class. I further discuss the kind of AGN GLAST is likely to detect, making some predictions going from the obvious to the likely, all the way to the less probable.

  20. Multimedia Authoring for CoPs Romain Deltour, Agn`es Guerraz, and Cecile Roisin

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Multimedia Authoring for CoPs Romain Deltour, Agn`es Guerraz, and C´ecile Roisin INRIA Rh and share information. As this information becomes more and more multimedia in nature, the challenge is to build multimedia authoring and publishing tools that meets CoPs requirements. In this paper we analyze

  1. agn iii spectra: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    luminous AGN within the redshift interval 1.7 < z < 1.9. This result implies that mid-infrared source counts at high redshift are dominated by AGN for f(24micron) > 1.0 mJy. D....

  2. The lifecycle of powerful AGN outflows

    E-Print Network [OSTI]

    Christian R. Kaiser; Philip N. Best

    2006-11-07T23:59:59.000Z

    During the course of this conference, much evidence was presented that points to an intimate connection between the energetic outflows driven by AGN and the energy budget and quite possibly also the evolution of their gaseous environments. However, it is still not clear if and how the AGN activity is triggered by the cooling gas, how long the activity lasts for and how these effects give rise to the observed distribution of morphologies of the outflows. In this contribution we concentrate on the high radio luminosity end of the AGN population. While most of the heating of the environmental gas may be due to less luminous and energetic outflows, these more powerful objects have a very profound influence on their surroundings. We will describe a simple model for powerful radio galaxies and radio-loud quasars that explains the dichotomy of their large-scale radio morphologies as well as their radio luminosity function.

  3. The lifecycle of powerful AGN outflows

    E-Print Network [OSTI]

    Kaiser, C R; Kaiser, Christian R.; Best, Philip N.

    2006-01-01T23:59:59.000Z

    During the course of this conference, much evidence was presented that points to an intimate connection between the energetic outflows driven by AGN and the energy budget and quite possibly also the evolution of their gaseous environments. However, it is still not clear if and how the AGN activity is triggered by the cooling gas, how long the activity lasts for and how these effects give rise to the observed distribution of morphologies of the outflows. In this contribution we concentrate on the high radio luminosity end of the AGN population. While most of the heating of the environmental gas may be due to less luminous and energetic outflows, these more powerful objects have a very profound influence on their surroundings. We will describe a simple model for powerful radio galaxies and radio-loud quasars that explains the dichotomy of their large-scale radio morphologies as well as their radio luminosity function.

  4. AGN jet launch scenarios Rony Keppens

    E-Print Network [OSTI]

    AGN jet launch scenarios Rony Keppens Centre for mathematical Plasma Astrophysics Department of Mathematics, KU Leuven Rony Keppens (KU Leuven) Jet launch Nov. 2013, IAC winter school 1 / 48 #12;Astrophysical Jets · astrophysical jets: ubiquitous presence of accretion disks Young Stellar Objects (YSO

  5. The Blast Wave Model for AGN Feedback: Effects on AGN Obscuration

    E-Print Network [OSTI]

    N. Menci; F. Fiore; S. Puccetti; A. Cavaliere

    2008-07-01T23:59:59.000Z

    We compute the effect of the galactic absorption on AGN emission in a cosmological context by including a physical model for AGN feeding and feedback in a semi-analytic model of galaxy formation. This is based on galaxy interactions as triggers for AGN accretion, and on expanding blast waves as a mechanism to propagate outwards the AGN energy injected into the interstellar medium at the center of galaxies. We first test our model against the observed number density of AGNs with different intrinsic luminosity as a function of redshift. The model yields a ''downsizing'' behavior in close agreement with the observed one for z2 and L_X 10^{22} cm^{-2} decreases with luminosity for z<1; in addition, the total (integrated over luminosity) absorbed fraction increases with redshift up to z around 2, and saturates to the value around 0.8 at higher redshifts. Finally, we predict the luminosity dependence of the absorbed fraction of AGNs with L_X< 3 10^{44} erg/s to weaken with increasing redshift. We compare our results with recent observations, and discuss their implications in the context of cosmological models of galaxy formation.

  6. Investigating a model of optimised AGN feedback

    E-Print Network [OSTI]

    Edward C. D. Pope

    2011-03-02T23:59:59.000Z

    Feedback heating from AGN in massive galaxies and galaxy clusters can be thought of as a naturally occurring control system which plays a significant role in regulating both star formation rates and the X-ray luminosity of the surrounding hot gas. In the simplest case, negative feedback can be viewed as a system response that is `optimised' to minimise deviations from equilibrium, such that the system rapidly evolves towards a steady state. However, a general solution of this form appears to be incompatible with radio observations which indicate intermittent AGN outbursts. Here, we explore an energetically favourable scenario in which feedback is required to both balance X-ray gas cooling, and minimise the sum of the energy radiated by the gas and the energy injected by the AGN. This specification is equivalent to ensuring that AGN heating balances the X-ray gas cooling with minimum black hole growth. It is shown that minimum energy heating occurs in discrete events, and not at a continuous, constant level. Furthermore, systems with stronger feedback experience proportionally more powerful heating events, but correspondingly smaller duty cycles. Interpreting observations from this perspective would imply that stronger feedback occurs in less massive objects - elliptical galaxies, rather than galaxy clusters. One direct consequence of this effect would be that AGN heating events are sufficiently powerful to expel hot gas from the gravitational potential of a galaxy, but not a galaxy cluster, which is consistent with theoretical explanations for the steepening of the L_X-T relation at temperatures below 1-2 keV.

  7. On The Nature of Low Luminosity Narrow Line AGN

    E-Print Network [OSTI]

    Ari Laor

    2003-02-26T23:59:59.000Z

    There is clear observational evidence that some narrow line (type 2) AGN have a hidden broad line region (BLR), and are thus intrinsically broad line (type 1) AGN. Does this AGN unification applies for all type 2 AGN? Indirect arguments suggest that some "true" type 2 AGN, i.e. AGN having no obscured BLR do exist, but it is not clear why the BLR is missing in these AGN. Here we point out a possible natural explanation. The observed radius-luminosity relation for the BLR implies an increasing line width with decreasing luminosity for a given black hole mass (Mbh). In addition, there appears to be an upper limit to the observed width of broad emission lines in AGN of Delta v_max~25,000 km/s, which may reflect a physical limit above which the BLR may not be able to survive. Thus, at a low enough luminosity the BLR radius shrinks below the Delta v_max radius, leaving no region where the BLR can exist, although the AGN may remain otherwise `normal'. The implied minimum bolometric luminosity required to sustain a BLR with Delta v<25,000 km/s is L_min~10^{41.8}(Mbh}/10^8M_sun)^2. All AGN with LAGN, i.e. narrow line AGN without a hidden BLR. Predictions for the true nature of low luminosity AGN in two samples of nearby galaxies are provided. These can be used to test the above L_min conjecture, and the predictions of other models for the size and origin of the BLR.

  8. AGES: THE AGN AND GALAXY EVOLUTION SURVEY

    SciTech Connect (OSTI)

    Kochanek, C. S. [Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States); Eisenstein, D. J.; Caldwell, N.; Jones, C.; Murray, S. S.; Forman, W. R.; Green, P. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Cool, R. J. [Department of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08544 (United States); Assef, R. J.; Eisenhardt, P.; Stern, D. [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 (United States); Jannuzi, B. T.; Dey, A. [NOAO, 950 North Cherry Avenue, Tucson, AZ 85719 (United States); Brown, M. J. I. [School of Physics, Monash University, Clayton, Victoria 3800 (Australia); Gonzalez, A. H. [Department of Astronomy, Bryant Space Science Center, University of Florida, Gainesville, FL 32611 (United States)

    2012-05-01T23:59:59.000Z

    The AGN and Galaxy Evolution Survey (AGES) is a redshift survey covering, in its standard fields, 7.7 deg{sup 2} of the Booetes field of the NOAO Deep Wide-Field Survey. The final sample consists of 23,745 redshifts. There are well-defined galaxy samples in 10 bands (the B{sub W} , R, I, J, K, IRAC 3.6, 4.5, 5.8, and 8.0 {mu}m, and MIPS 24 {mu}m bands) to a limiting magnitude of I < 20 mag for spectroscopy. For these galaxies, we obtained 18,163 redshifts from a sample of 35,200 galaxies, where random sparse sampling was used to define statistically complete sub-samples in all 10 photometric bands. The median galaxy redshift is 0.31, and 90% of the redshifts are in the range 0.085 < z < 0.66. Active galactic nuclei (AGNs) were selected as radio, X-ray, IRAC mid-IR, and MIPS 24 {mu}m sources to fainter limiting magnitudes (I < 22.5 mag for point sources). Redshifts were obtained for 4764 quasars and galaxies with AGN signatures, with 2926, 1718, 605, 119, and 13 above redshifts of 0.5, 1, 2, 3, and 4, respectively. We detail all the AGES selection procedures and present the complete spectroscopic redshift catalogs and spectral energy distribution decompositions. Photometric redshift estimates are provided for all sources in the AGES samples.

  9. Correlation between Galaxy Mergers and Luminous AGN

    E-Print Network [OSTI]

    Hong, Jueun; Kim, Minjin; Ho, Luis C

    2015-01-01T23:59:59.000Z

    It is not yet clear what triggers the activity of active galactic nuclei (AGNs), but galaxy merging has been suspected to be one of the main mechanisms fuelling the activity. Using deep optical images taken at various ground-based telescopes, we investigate the fraction of galaxy mergers in 39 luminous AGNs (M$_{R}\\, \\lesssim$ -22.6 mag) at $z \\leq$ 0.3 (a median redshift of 0.155), of which the host galaxies are generally considered as early-type galaxies. Through visual inspection of the images, we find that 17 of 39 AGN host galaxies (43.6%) show the evidence for current or past mergers like tidal tails, shells, and disturbed morphology. In order to see if this fraction is abnormally high, we also examined the merging fraction of normal early-type galaxies in the Sloan Digital Sky Survey (SDSS) Strip 82 data (a median redshift of 0.04), of which the surface-brightness limit is comparable to our imaging data. To correct for the effects related to the redshift difference of the two samples, we performed an i...

  10. Ultra-fast outflows (aka UFOs) from AGNs and QSOs

    E-Print Network [OSTI]

    Cappi, M; Giustini, M

    2013-01-01T23:59:59.000Z

    During the last decade, strong observational evidence has been accumulated for the existence of massive, high velocity winds/outflows (aka Ultra Fast Outflows, UFOs) in nearby AGNs and in more distant quasars. Here we briefly review some of the most recent developments in this field and discuss the relevance of UFOs for both understanding the physics of accretion disk winds in AGNs, and for quantifying the global amount of AGN feedback on the surrounding medium.

  11. Blue Note

    ScienceCinema (OSTI)

    Murray Gibson

    2010-01-08T23:59:59.000Z

    Argonne's Murray Gibson is a physicist whose life's work includes finding patterns among atoms. The love of distinguishing patterns also drives Gibson as a musician and Blues enthusiast."Blue" notes are very harmonic notes that are missing from the equal temperament scale.The techniques of piano blues and jazz represent the melding of African and Western music into something totally new and exciting.

  12. Blue Note

    SciTech Connect (OSTI)

    Murray Gibson

    2007-04-27T23:59:59.000Z

    Argonne's Murray Gibson is a physicist whose life's work includes finding patterns among atoms. The love of distinguishing patterns also drives Gibson as a musician and Blues enthusiast."Blue" notes are very harmonic notes that are missing from the equal temperament scale.The techniques of piano blues and jazz represent the melding of African and Western music into something totally new and exciting.

  13. UHECRs from the Radio Lobes of AGNs

    E-Print Network [OSTI]

    F. Fraschetti; F. Melia

    2008-10-07T23:59:59.000Z

    We report a stochastic mechanism of particle acceleration from first principles in an environment having properties like those of Radio Lobes in AGNs. We show that energies $\\sim 10^{20}$ eV are reached in $\\sim 10^6$ years for protons. Our results reopen the question regarding the nature of the high-energy cutoff in the observed spectrum: whether it is due solely to propagation effects, or whether it is also affected by the maximum energy permitted by the acceleration process itself.

  14. Multimedia Authoring for Communities of Teachers Agn`es Guerraz and Cecile Roisin and Jan Mikac and Romain Deltour

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Multimedia Authoring for Communities of Teachers Agn`es Guerraz and C´ecile Roisin and Jan Mik to produce, structure and share information. As this information becomes more and more multimedia in nature, the challenge is to build multimedia authoring and publishing tools that meets requirements of the community

  15. The Spatial Clustering of ROSAT All-Sky Survey AGNs III. Expanded Sample and Comparison with Optical AGNs

    E-Print Network [OSTI]

    Krumpe, Mirko; Coil, Alison L; Aceves, Hector

    2011-01-01T23:59:59.000Z

    This is the third paper in a series that reports on our investigation of the clustering properties of AGNs identified in the ROSAT All-Sky Survey (RASS) and Sloan Digital Sky Survey (SDSS). In this paper, we extend the redshift range to 0.07AGNs with and without radio detections as well as for X-ray selected narrow-line RASS/SDSS AGNs. We measure the clustering amplitude through cross-correlation functions (CCFs) with SDSS galaxies and derive the bias by applying a halo occupation distribution (HOD) model directly to the CCFs. We find no statistically convincing difference in the clustering of X-ray and optically-selected broad-line AGNs, as well as with samples in which radio-detected AGNs are excluded. This is in contrast to low redshift optically-selected narrow-line AGNs, where radio-loud AGNs are found in more massive halos than optical AGNs without a radio-detection. The typical dark matter halo mass...

  16. From gas to starburst and AGN

    E-Print Network [OSTI]

    Johan H. Knapen

    2003-12-05T23:59:59.000Z

    Although it is clear that the circumnuclear regions of galaxies are intimately related to their host galaxies, most directly through their bars, it remains unclear what exactly initiates and fuels nuclear stellar (starburst) and non-stellar (AGN) activity. Deviations from axisymmetry in the gravitational potential of a galaxy, set up by a bar or an interaction, are known to cause gas inflow, and must at some scale and level be related to the fueling of AGN and starbursts. We review the observed relations between bars and interactions on the one, and nuclear activity of the Seyfert and starburst variety on the other hand, and conclude that none of these relations is particularly significant in a statistical sense, except in extreme and rare cases, such as ultra-luminous infrared galaxies. Nuclear rings of star formation, however, are not only related directly to non-axisymmetries in the potential, but also, it seems, to the occurrence of nuclear activity. Their role as potential tracers of the fueling process must be further explored.

  17. Spectral decomposition of broad-line agns and host galaxies

    SciTech Connect (OSTI)

    Vanden Berk, Daniel E.; Shen, Jiajian; /Penn State U., Astron. Astrophys.; Yip, Ching-Wa; /Pittsburgh U.; Schneider, Donald P.; /Penn State U., Astron. Astrophys.; Connolly,; /Pittsburgh U.; Burton, Ross E.; /Pittsburgh U. /Case Western Reserve U.; Jester, Sebastian; /Fermilab; Hall, Patrick B.; /York U., Canada; Szalay, Alex S.; /Johns Hopkins; Brinkmann, John; /Apache Point Observ.

    2005-09-01T23:59:59.000Z

    Using an eigenspectrum decomposition technique, we separate the host galaxy from the broad line active galactic nucleus (AGN) in a set of 4666 spectra from the Sloan Digital Sky Survey (SDSS), from redshifts near zero up to about 0.75. The decomposition technique uses separate sets of galaxy and quasar eigenspectra to efficiently and reliably separate the AGN and host spectroscopic components. The technique accurately reproduces the host galaxy spectrum, its contributing fraction, and its classification. We show how the accuracy of the decomposition depends upon S/N, host galaxy fraction, and the galaxy class. Based on the eigencoefficients, the sample of SDSS broad-line AGN host galaxies spans a wide range of spectral types, but the distribution differs significantly from inactive galaxies. In particular, post-starburst activity appears to be much more common among AGN host galaxies. The luminosities of the hosts are much higher than expected for normal early-type galaxies, and their colors become increasingly bluer than early-type galaxies with increasing host luminosity. Most of the AGNs with detected hosts are emitting at between 1% and 10% of their estimated Eddington luminosities, but the sensitivity of the technique usually does not extend to the Eddington limit. There are mild correlations among the AGN and host galaxy eigencoefficients, possibly indicating a link between recent star formation and the onset of AGN activity. The catalog of spectral reconstruction parameters is available as an electronic table.

  18. Radio faint AGN: a tale of two populations

    E-Print Network [OSTI]

    Padovani, P; Kellermann, K I; Miller, N; Mainieri, V; Tozzi, P

    2015-01-01T23:59:59.000Z

    We study the Extended Chandra Deep Field South (E-CDFS) Very Large Array sample, which reaches a flux density limit at 1.4 GHz of 32.5 microJy at the field centre and redshift ~ 4, and covers ~ 0.3 deg^2. Number counts are presented for the whole sample while the evolutionary properties and luminosity functions are derived for active galactic nuclei (AGN). The faint radio sky contains two totally distinct AGN populations, characterised by very different evolutions, luminosity functions, and Eddington ratios: radio-quiet (RQ)/radiative-mode, and radio-loud/jet-mode AGN. The radio power of RQ AGN evolves ~ (1+z)^2.5, similarly to star-forming galaxies, while the number density of radio-loud ones has a peak at ~ 0.5 and then declines at higher redshifts. The number density of radio-selected RQ AGN is consistent with that of X-ray selected AGN, which shows that we are sampling the same population. The unbiased fraction of radiative-mode RL AGN, derived from our own and previously published data, is a strong funct...

  19. Unveiling the distribution of absorption in the AGN population

    E-Print Network [OSTI]

    Tom Dwelly; Mathew J. Page

    2005-11-15T23:59:59.000Z

    We use the very deep XMM-Newton observations in the CDF-S to measure the distribution of absorption in the AGN population. We describe the Monte Carlo method used to unveil the intrinsic properties of the AGN using their multi-band X-ray colours. The measured distribution of AGN in z, L_X and N_H space is compared with the distributions predicted by a number of XLFs and absorption models. In contrast to other studies, we do not find any evidence that the absorption distribution is dependent on redshift or intrinsic luminosity.

  20. Starbursts and AGN Fueling through Secular Evolution

    E-Print Network [OSTI]

    F. Combes

    2006-02-14T23:59:59.000Z

    Except in the most extreme cases of nuclear activity, either starbursts or AGN, it is difficult to find observationnally a close link between the dynamics and the activity. Theoretically however, the necessary step to fuel the gas to the center, is that gravity torques are created through a non-axisymmetric pattern, either bar and/or spiral, triggered or not by a tidal interaction. We describe the sequence of processes for a typical evolution cycle for a spiral galaxy, and the possible efficient feedback mechanisms. The various morphologies and dynamical states of spiral galaxies are interpreted in terms of a sequence of evolutionary phases, and the corresponding time-scales can be estimated from observations. In this scenario, activity in galaxies is related to the appearance of bar instability, although they might not be synchronised in phase. The role of external gas accretion in the secular evolution is discussed.

  1. agn dusty tori: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    high-ionization emission lines, and 3) viewing angle toward dusty tori based on mid-infrared color. Yoshiaki Taniguchi; Takashi Murayama; Hideaki Mouri 2000-01-26 2 AGN Dusty...

  2. agn snapshot survey: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Infrared Surveys for AGN CERN Preprints Summary: From the earliest extragalactic infrared...

  3. agn feedback observations: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Christopher S; Heinz, Sebastian 2008-01-01 18 Feeding Versus Feedback in AGNs from Near-Infrared IFU Observations: The Case of Mrk79 CERN Preprints Summary: We have mapped the...

  4. agn feedback vlt: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Field South using X-ray and radio data for sample selection. Combined with archival far infrared data as a reliable tracer of star formation activity in the AGN host galaxies, we...

  5. Radio AGN evolution with low frequency radio surveys 

    E-Print Network [OSTI]

    Ker, Louise Moira

    2013-07-01T23:59:59.000Z

    Supermassive black holes are leading candidates for the regulation of galaxy growth and evolution over cosmic time, via ‘feedback’ processes, whereby outflows from the Active Galactic Nuclei (AGN) halt star formation ...

  6. Measuring AGN Feedback with the Sunyaev-Zel'dovich Effect

    E-Print Network [OSTI]

    Scannapieco, Evan; Couchman, H M P

    2007-01-01T23:59:59.000Z

    One of the most important and poorly-understood issues in structure formation is the role of outflows driven by active galactic nuclei (AGN). Using large-scale cosmological simulations, we compute the impact of such outflows on the small-scale distribution of the cosmic microwave background (CMB). Like gravitationally-heated structures, AGN outflows induce CMB distortions both through thermal motions and peculiar velocities, by processes known as the thermal and kinetic Sunyaev-Zel'dovich (SZ) effects, respectively. For AGN outflows the thermal SZ effect is dominant, doubling the angular power spectrum on arcminute scales. But the most distinct imprint of AGN feedback is a substantial increase in the thermal SZ distortions around elliptical galaxies, post-starburst ellipticals, and quasars, which is linearly proportional to the outflow energy. While point source subtraction is difficult for quasars, we show that by appropriately stacking microwave measurements around early-type galaxies, the new generation of...

  7. agn monitoring project: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Yuzuru Yoshii 2008-10-16 6 The Lick AGN Monitoring Project: Velocity-Delay Maps from the Maximum-Entropy Method for Arp 151 CERN Preprints Summary: We present velocity-delay maps...

  8. OTS NOTE

    Office of Legacy Management (LM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn AprilA group currentBradleyTableSelling7 AugustAFRICAN .METALS~ c3 Alexander941 OTS NOTE

  9. AGN: The High-Energy Status before INTEGRAL

    E-Print Network [OSTI]

    W. Collmar

    2001-05-11T23:59:59.000Z

    Much progress in the knowledge of the high-energy emission (>50 keV) from Active Galactic Nuclei has been made during the last decade, predominately by the experiments aboard the Compton Gamma-Ray Observatory. After the end of the CGRO mission and prior to the upcoming INTEGRAL mission the current status of high-energy emission properties and scenarios is summarized for different AGN classes. In addition, prospects for INTEGRAL observations of AGN are given.

  10. Clustering Measurements of broad-line AGNs: Review and Future

    E-Print Network [OSTI]

    Krumpe, Mirko; Coil, Alison L

    2013-01-01T23:59:59.000Z

    Despite substantial effort, the precise physical processes that lead to the growth of super-massive black holes in the centers of galaxies are still not well understood. These phases of black hole growth are thought to be of key importance in understanding galaxy evolution. Forthcoming missions such as eROSITA, HETDEX, eBOSS, BigBOSS, LSST, and Pan-STARRS will compile by far the largest ever Active Galactic Nuclei (AGNs) catalogs which will allow us to measure the spatial distribution of AGNs in the universe with unprecedented accuracy. For the first time, AGN clustering measurements will reach a level of precision that will not only allow for an alternative approach to answering open questions in AGN/galaxy co-evolution but will open a new frontier, allowing us to precisely determine cosmological parameters. This paper reviews the large-scale clustering measurements of broad line AGNs. We summarize how clustering is measured and which constraints can be derived from AGN clustering measurements, we discuss re...

  11. Electricity Advisory Committee - Federal Register Notices | Department...

    Energy Savers [EERE]

    Federal Register Notices Electricity Advisory Committee - Federal Register Notices Electricity Advisory Committee - Federal Register Notices February 17, 2015 Electricity Advisory...

  12. Measuring AGN Feedback with the Sunyaev-Zel'dovich Effect

    E-Print Network [OSTI]

    Evan Scannapieco; Robert J. Thacker; H. M. P. Couchman

    2007-09-06T23:59:59.000Z

    One of the most important and poorly-understood issues in structure formation is the role of outflows driven by active galactic nuclei (AGN). Using large-scale cosmological simulations, we compute the impact of such outflows on the small-scale distribution of the cosmic microwave background (CMB). Like gravitationally-heated structures, AGN outflows induce CMB distortions both through thermal motions and peculiar velocities, by processes known as the thermal and kinetic Sunyaev-Zel'dovich (SZ) effects, respectively. For AGN outflows the thermal SZ effect is dominant, doubling the angular power spectrum on arcminute scales. But the most distinct imprint of AGN feedback is a substantial increase in the thermal SZ distortions around elliptical galaxies, post-starburst ellipticals, and quasars, which is linearly proportional to the outflow energy. While point source subtraction is difficult for quasars, we show that by appropriately stacking microwave measurements around early-type galaxies, the new generation of small-scale microwave telescopes will be able to directly measure AGN feedback at the level important for current theoretical models.

  13. Radio-AGN Feedback: When the Little Ones were Monsters

    E-Print Network [OSTI]

    Williams, W L

    2015-01-01T23:59:59.000Z

    We present a study of the evolution of the fraction of radio-loud active galactic nuclei (AGN) as a function of their host stellar mass. We make use of two samples of radio galaxies: one in the local universe, $0.01 10^{24}$ W/Hz at z ~ 1-2 while the radio-loud fraction for higher mass galaxies ($M_* > 10^{11.25}$ M$_{\\odot}$) remains the same. We argue that this increase is driven largely by the increase in cold or radiative mode accretion with increasing cold gas supply at earlier epochs. The increasing population of low mass Radio-Loud AGN can thus explain the upturn in the Radio Luminosity Function (RLF) at high redshift which is important for understanding the impact of AGN feedback in galaxy evolution.

  14. The Fueling and Evolution of AGN: Internal and External Triggers

    E-Print Network [OSTI]

    Shardha Jogee

    2008-07-10T23:59:59.000Z

    In this chapter, I review the fueling and evolution of active galactic nuclei (AGN) under the influence of internal and external triggers, namely intrinsic properties of host galaxies (morphological or Hubble type, color, presence of bars and other non-axisymmetric features, etc) and external factors such as environment and interactions. The most daunting challenge in fueling AGN is arguably the angular momentum problem as even matter located at a radius of a few hundred pc must lose more than 99.99 % of its specific angular momentum before it is fit for consumption by a BH. I review mass accretion rates, angular momentum requirements, the effectiveness of different fueling mechanisms, and the growth and mass density of black BHs at different epochs. I discuss connections between the nuclear and larger-scale properties of AGN, both locally and at intermediate redshifts, outlining some recent results from the GEMS and GOODS HST surveys.

  15. The role of an accretion disk in AGN variability

    E-Print Network [OSTI]

    B. Czerny

    2004-09-10T23:59:59.000Z

    Optically thick accretion disks are considered to be important ingredients of luminous AGN. The claim of their existence is well supported by observations and recent years brought some progress in understanding of their dynamics. However, the role of accretion disks in optical/UV/X-ray variability of AGN is not quite clear. Most probably, in short timescales the disk reprocesses the variable X-ray flux but at longer timescales the variations of the disk structure lead directly to optical/UV variations as well as affect, or even create, the X-ray variability pattern. We urgently need a considerable progress in time-dependent disk models to close the gap between the theory and the stream of data coming from the AGN monitoring.

  16. Indian Academy of Sciences Notice inviting quotations from housekeeping agencies

    E-Print Network [OSTI]

    Joshi, Yogesh Moreshwar

    Indian Academy of Sciences Bangalore Notice inviting quotations from housekeeping agencies Indian Academy of Sciences, Bangalore (Academy), invites quotations for Housekeeping services at its office will be provided by the Academy. Please Note: The Academy reserves the right to reject/not to accept any quotation

  17. Multidimensional analysis of X-ray variability of AGN

    E-Print Network [OSTI]

    A. V. Halevin

    2004-09-07T23:59:59.000Z

    In this work we analyzed X-ray light curves of active galactic nucleus NGC 4051 obtained using Advanced CCD Imaging Spectrometer of Chandra satellite. Taking into account mainly flaring behaviour of AGNs we have used wavelet analysis for searching of short time lived events on light curves.

  18. Average Fe K-alpha emission from distant AGN

    E-Print Network [OSTI]

    Corral, A; Carrera, F J; Barcons, X; Mateos, S; Ebrero, J; Krumpe, M; Schwope, A; Tedds, J A; Watson, M G

    2008-01-01T23:59:59.000Z

    One of the most important parameters in the XRB (X-ray background) synthesis models is the average efficiency of accretion onto SMBH (super-massive black holes). This can be inferred from the shape of broad relativistic Fe lines seen in X-ray spectra of AGN (active galactic nuclei). Several studies have tried to measure the mean Fe emission properties of AGN at different depths with very different results. We compute the mean Fe emission from a large and representative sample of AGN X-ray spectra up to redshift ~ 3.5. We developed a method of computing the rest-frame X-ray average spectrum and applied it to a large sample (more than 600 objects) of type 1 AGN from two complementary medium sensitivity surveys based on XMM-Newton data, the AXIS and XWAS samples. This method makes use of medium-to-low quality spectra without needing to fit complex models to the individual spectra but with computing a mean spectrum for the whole sample. Extensive quality tests were performed by comparing real to simulated data, a...

  19. Interaction of the AGN and X-ray Emitting Gas

    E-Print Network [OSTI]

    Paul Nulsen

    2003-10-07T23:59:59.000Z

    The process that prevents the deposition of cooled gas in cooling flows must rely on feedback in order to maintain gas with short cooling times, while preventing the bulk of the gas from cooling to low temperatures. The primary candidate for the feedback mechanism is the accretion of cooled and cooling gas by an active galactic nucleus (AGN). Despite some difficulties with this model, the high incidence of central radio sources in cooling flows and the common occurrence of radio lobe cavities, together, support this view. The Bondi accretion rate for the intracluster gas onto the AGN depends on the gas properties only through its specific entropy and that is governed directly by competition between heating and cooling. This provides a viable link for the feedback process. It is argued that the mass accreted between outbursts by the central AGN is only sensitive to the mass of the black hole and the gas temperature. Bondi accretion by an AGN leads to a simple expression for outburst energy that can be tested against observations.

  20. Average Fe K-alpha emission from distant AGN

    E-Print Network [OSTI]

    A. Corral; M. J. Page; F. J. Carrera; X. Barcons; S. Mateos; J. Ebrero; M. Krumpe; A. Schwope; J. A. Tedds; M. G. Watson

    2008-10-02T23:59:59.000Z

    One of the most important parameters in the XRB (X-ray background) synthesis models is the average efficiency of accretion onto SMBH (super-massive black holes). This can be inferred from the shape of broad relativistic Fe lines seen in X-ray spectra of AGN (active galactic nuclei). Several studies have tried to measure the mean Fe emission properties of AGN at different depths with very different results. We compute the mean Fe emission from a large and representative sample of AGN X-ray spectra up to redshift ~ 3.5. We developed a method of computing the rest-frame X-ray average spectrum and applied it to a large sample (more than 600 objects) of type 1 AGN from two complementary medium sensitivity surveys based on XMM-Newton data, the AXIS and XWAS samples. This method makes use of medium-to-low quality spectra without needing to fit complex models to the individual spectra but with computing a mean spectrum for the whole sample. Extensive quality tests were performed by comparing real to simulated data, and a significance for the detection of any feature over an underlying continuum was derived. We detect with a 99.9% significance an unresolved Fe K-alpha emission line around 6.4 keV with an EW ~ 90 eV, but we find no compelling evidence of any significant broad relativistic emission line in the final average spectrum. Deviations from a power law around the narrow line are best represented by a reflection component arising from cold or low-ionization material. We estimate an upper limit for the EW of any relativistic line of 400 eV at a 3 sigma confidence level. We also marginally detect the so-called Iwasawa-Taniguchi effect on the EW for the unresolved emission line, which appears weaker for higher luminosity AGN.

  1. Radiation Pressure Supported Starburst Disks and AGN Fueling

    E-Print Network [OSTI]

    Todd A. Thompson; Eliot Quataert; Norm Murray

    2005-05-19T23:59:59.000Z

    We consider the structure of marginally Toomre-stable starburst disks under the assumption that radiation pressure on dust grains provides the dominant vertical support against gravity. This is particularly appropriate when the disk is optically thick to its own IR radiation, as in the central regions of ULIRGs. Because the disk radiates at its Eddington limit, the Schmidt-law for star formation changes in the optically-thick limit, with the star formation rate per unit area scaling as Sigma_g/kappa, where Sigma_g is the gas surface density and kappa is the mean opacity. We show that optically thick starburst disks have a characteristic flux and dust effective temperature of F ~ 10^{13} L_sun/kpc^2 and T_eff ~ 90K, respectively. We compare our predictions with observations and find good agreement. We extend our model from many-hundred parsec scales to sub-parsec scales and address the problem of fueling AGN. We assume that angular momentum transport proceeds via global torques rather than a local viscosity. We account for the radial depletion of gas due to star formation and find a strong bifurcation between two classes of disk models: (1) solutions with a starburst on large scales that consumes all of the gas with little fueling of a central AGN and (2) models with an outer large-scale starburst accompanied by a more compact starburst on 1-10 pc scales and a bright central AGN. The luminosity of the latter models is in many cases dominated by the AGN. We show that the vertical thickness of the starburst disk on pc scales can approach h ~ r, perhaps accounting for the nuclear obscuration in some Type 2 AGN. We also argue that the disk of young stars in the Galactic Center may be the remnant of such a compact nuclear starburst.

  2. VOL2NOTE.CHP:Corel VENTURA

    Gasoline and Diesel Fuel Update (EIA)

    Tables * Note 4. Domestic Crude Oil Production * Note 5. Export Data * Note 6. Quality Control and Data Revision * Note 7. Frames Maintenance * Note 8. Descriptive Monthly...

  3. Constraints on AGN accretion disc viscosity derived from continuum variability

    E-Print Network [OSTI]

    Rhaana L. C. Starling; Aneta Siemiginowska; Phil Uttley; Roberto Soria

    2003-09-10T23:59:59.000Z

    We estimate a value of the viscosity parameter in AGN accretion discs for the PG quasar sample. We assume that optical variability on time-scales of months to years is caused by local instabilities in the inner accretion disc. Comparing the observed variability time-scales to the thermal time-scales of alpha-disc models we obtain constraints on the viscosity parameter for the sample. We find that, at a given L/L_Edd, the entire sample is consistent with a single value of the viscosity parameter, alpha. We obtain constraints of 0.01 < alpha < 0.03 for 0.01 < L/L_Edd < 1.0. This narrow range suggests that these AGN are all seen in a single state, with a correspondingly narrow spread of black hole masses or accretion rates. The value of alpha we derive is consistent with predictions by current simulation s in which MHD turbulence is the primary viscosity mechanism.

  4. Key Science Observations of AGNs with KaVA Array

    E-Print Network [OSTI]

    Kino, Motoki; Zhao, Guang-Yao; Sohn, Bong Won

    2015-01-01T23:59:59.000Z

    KaVA (KVN and VERA Array) is a new combined VLBI array with KVN (Korean VLBI Network) and VERA (VLBI Exploration of Radio Astrometry). First, we briefly review the imaging capabilities of KaVA array which actually achieves more than three times better dynamic range than that achieved by VERA alone. The KaVA images clearly show detailed structures of extended radio jets in AGNs. Next, we represent the key science program to be led by KaVA AGN sub working group. We will conduct the monitoring observations of Sgr A* and M87 because of the largeness of their central super-massive black hole angular sizes. The main science goals of the program are (i) testing magnetically-driven-jet paradigm by mapping velocity fields of the M87 jet, and (ii) obtaining tight constraints on physical properties of radio emitting region in Sgr A*.

  5. Near Infrared observations of Soft X-ray selected AGN

    E-Print Network [OSTI]

    D. Grupe; H. -C Thomas

    2002-02-21T23:59:59.000Z

    We report the results of near infrared observations of 19 soft X-ray selected AGN. The goal of the observations was to search for strong, narrow Paschen-alpha or Brackett-gamma emission lines, as a sign of nuclear starbursts. We found Pa-alpha emission in the spectra of 11 sources and Br-gamma in at least five. Strong NIR emission has been found in two sources, CBS 126 and Mkn 766, both objects with strong [OIII]5007 emission, weak FeII emission and wavelength dependent degree of polarization in the optical. Classical Narrow Line Seyfert 1 galaxies do not show exceptionally strong NIR emission lines. We present the results of our study and discuss how our findings fit into an evolutionary scheme of AGN.

  6. On Black Hole Masses and Radio Loudness in AGN

    E-Print Network [OSTI]

    Ari Laor

    2000-09-13T23:59:59.000Z

    The distribution of radio to optical fluxes in AGN is bimodal. The physical origin for this bimodality is not understood. In this Letter I describe observational evidence, based on the Boroson & Green PG quasar sample, that the radio loudness bimodality is strongly related to the black hole mass (M_BH). Nearly all PG quasars with M_BH>10^9M_sun are radio loud, while quasars with M_BH<3x10^8M_sun are practically all radio quiet. This result is consistent with the dependence of quasar host galaxy morphology on radio loudness. There is no simple physical explanation for this result, but it may provide a clue on how jets are formed near massive black holes. The radio loudness--black hole mass relationship suggests that the properties of various types of AGN may be largely set by three basic parameters, M_BH, L/L_Eddington, and inclination angle.

  7. [On the jet contribution to the AGN cosmic energy budget

    E-Print Network [OSTI]

    A. Cattaneo; P. N. Best

    2008-12-08T23:59:59.000Z

    Black holes release energy via the production of photons in their accretion discs but also via the acceleration of jets. We investigate the relative importance of these two paths over cosmic time by determining the mechanical luminosity function (LF) of radio sources and by comparing it to a previous determination of the bolometric LF of active galactic nuclei (AGN) from X-ray, optical and infrared observations. The mechanical LF of radio sources is computed in two steps: the determination of the mechanical luminosity as a function of the radio luminosity and its convolution with the radio LF of radio sources. Even with the large uncertainty deriving from the former, we can conclude that the contribution of jets is unlikely to be much larger than 10% of the AGN energy budget at any cosmic epoch.

  8. Properties of AGN coronae in the NuSTAR era

    E-Print Network [OSTI]

    Fabian, A C; Kara, E; Parker, M L; Vasudevan, R; Reynolds, C S

    2015-01-01T23:59:59.000Z

    The focussing optics of NuSTAR have enabled high signal-to-noise spectra to be obtained from many X-ray bright Active Galactic Nuclei (AGN) and Galactic Black Hole Binaries (BHB). Spectral modelling then allows robust characterization of the spectral index and upper energy cutoff of the coronal power-law continuum, after accounting for reflection and absorption effects. Spectral-timing studies, such as reverberation and broad iron line fitting, of these sources yield coronal sizes, often showing them to be small and in the range of 3 to 10 gravitational radii in size. Our results indicate that coronae are hot and radiatively compact, lying close to the boundary of the region in the compactness - temperature diagram which is forbidden due to runaway pair production. The coincidence suggests that pair production and annihilation are essential ingredients in the coronae of AGN and BHB and that they control the shape of the observed spectra.

  9. XMM-Newton Observations of AGN Iron Line Profiles

    E-Print Network [OSTI]

    James Reeves

    2002-11-18T23:59:59.000Z

    XMM-Newton observations of type I AGN are presented. The properties of the iron K emission line are reviewed, the majority of AGN observed by XMM-Newton show narrow, unresolved (by XMM) iron lines at 6.4 keV from cold matter that must originate far from the inner accretion disc, perhaps in the putative torus or outer broad line region. The strength of this narrow line appears to decrease with luminosity, implying a reduction in the covering fraction of this material in the more luminous quasars. Few examples of the broad, relativistic iron line profile have been found by XMM-Newton, although in MCG -6-30-15, the extreme breadth of the broad line component may imply a Kerr metric for the central black hole. Generally, relativistic Fe K line profiles are not required in a number of other Seyfert 1 X-ray spectra.

  10. Adiabatic expansion and magnetic fields in AGN jets

    E-Print Network [OSTI]

    A. B. Pushkarev; Y. Y. Kovalev; A. P. Lobanov

    2008-12-25T23:59:59.000Z

    Results of high-resolution simultaneous multi-frequency 8.1-15.4 GHz VLBA polarimetric observations of relativistic jets in active galactic nuclei (the MOJAVE-2 project) are analyzed. We compare characteristics of VLBI features with jet model predictions and test if adiabatic expansion is a dominating mechanism for the evolution of relativistic shocks in parsec-scale AGN jets. We also discuss magnetic field configuration, both predicted by the model and deduced from electric vector position angle measurements.

  11. Required Annual Notices

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Required Annual Notices The Women's Health and Cancer Rights Act of 1998 (WHCRA) The medical programs sponsored by LANS will not restrict benefits if you or your dependent...

  12. Required Annual Notices

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Annual Notices The Women's Health and Cancer Rights Act of 1998 (WHCRA) The medical programs sponsored by LANS will not restrict benefits if you or your dependent receives...

  13. Time variability of AGN and heating of cooling flows

    E-Print Network [OSTI]

    Carlo Nipoti; James Binney

    2005-05-03T23:59:59.000Z

    There is increasing evidence that AGN mechanical feedback is important in the energetics of cooling flows in galaxies and galaxy clusters. We investigate the implications of the variability of AGN mechanical luminosity L_m on observations of cooling flows and radio galaxies in general. It is natural to assume that l=ln(L_m/L_x) is a Gaussian process. Then L_m will be log-normally distributed at fixed cooling luminosity L_x, and the variance in a measure of L_m will increase with the time-resolution of the measure. We test the consistency of these predictions with existing data. These tests hinge on the power spectrum of l(t). Monitoring of Seyfert galaxies combined with estimates of the duty cycle of quasars imply flicker noise spectra, similar to those of microquasars. We combine a sample of sources in cooling flows that have cavities with the assumption that the average mechanical luminosity of the AGN equals L_x. Given that the mechanical luminosities are characterized by flicker noise, we find that their spectral amplitudes lie between the estimated amplitudes of quasars and the measured values for the radio luminosities of microquasars. The model together with the observation that powerful radio galaxies lie within a narrow range in optical luminosity, predicts the luminosity function of radio galaxies, in agreement with observations. Forthcoming radio surveys will test the prediction that the luminosity function turns over at about the smallest luminosities so far probed. [Abridged

  14. Parsec-Scale Jet-Environment Interactions in AGN

    E-Print Network [OSTI]

    Matthew L. Lister

    2007-07-12T23:59:59.000Z

    Observations made with the VLBA have led to fundamental advances in our understanding of how radio jets in AGN evolve from parsec-scales out to distances exceeding several hundred kiloparsecs. In this review I discuss current models of young radio source evolution, as well as the observational evidence for a rapid change in jet properties on scales of ~1 kpc. A central topic of current debate is the relative importance of intermittent jet fueling versus jet-environment interactions in causing a drop-off in powerful radio sources at this critical evolutionary stage. Recent 3-D hydrodynamical jet simulations suggest that dense environments and cloud collisions can temporarily stifle, but not completely halt powerful relativistic jets. Several VLBA studies of jet-ISM interactions in both blazars and weak Seyfert jets have indicated that collimated outflows are indeed possible in dense environments. At present, the bulk of the evidence favors intermittent AGN accretion as the dominant factor in determining the evolutionary path of large numbers of AGN jets.

  15. Federal Register Notices | Department of Energy

    Office of Environmental Management (EM)

    Information Center Library Federal Register Notices Federal Register Notices May 22, 2015 Electricity Advisory Committee Notice of Open Meeting June 29 and 30, 2015: Federal...

  16. Three years of Swift/BAT Survey of AGN: Reconciling Theory and Observations?

    SciTech Connect (OSTI)

    Burlon, D.; /Garching, Max Planck Inst., MPE; Ajello, M.; /SLAC /KIPAC, Menlo Park; Greiner, J.; /Garching, Max Planck Inst., MPE; Comastri, A.; /Muenchen, Tech. U. Universe; Merloni, A.; /Garching, Max Planck Inst., MPE /Muenchen, Tech. U. Universe; Gehrels, N.; /NASA, Goddard

    2011-02-07T23:59:59.000Z

    It is well accepted that unabsorbed as well as absorbed AGN are needed to explain the nature and the shape of the Cosmic X-ray background, even if the fraction of highly absorbed objects (dubbed Compton-thick sources) substantially still escapes detection. We derive and analyze the absorption distribution using a complete sample of AGN detected by Swift-BAT in the first three years of the survey. The fraction of Compton-thick AGN represents only 4.6% of the total AGN population detected by Swift-BAT. However, we show that once corrected for the bias against the detection of very absorbed sources the real intrinsic fraction of Compton-thick AGN is 20{sub -6}{sup +9}%. We proved for the first time (also in the BAT band) that the anti-correlation of the fraction of absorbed AGN and luminosity it tightly connected to the different behavior of the luminosity functions (XLFs) of absorbed and unabsorbed AGN. This points towards a difference between the two subsamples of objects with absorbed AGN being, on average, intrinsically less luminous than unobscured ones. Moreover the XLFs show that the fraction of obscured AGN might also decrease at very low luminosity. This can be successfully interpreted in the framework of a disk cloud outflow scenario as the disappearance of the obscuring region below a critical luminosity. Our results are discussed in the framework of population synthesis models and the origin of the Cosmic X-ray Background.

  17. Privacy notice Applicability

    E-Print Network [OSTI]

    Zhou, Yaoqi

    to other university web sites should review the privacy notices for the particular sites they visit. IUPUI Health Services is not responsible for the content of other web sites or for the privacy practices of web notice. Collection and Use Passive/Automatic Collection When you view pages on our site, the web server

  18. Blazars and the emerging AGN/black hole X-ray binary paradigm

    E-Print Network [OSTI]

    P. Uttley

    2005-08-02T23:59:59.000Z

    We briefly review the emerging paradigm which links the radio-quiet and radio-loud classes of AGN to the different accretion states observed in stellar mass black hole X-ray binary systems (BHXRBs), and discuss the relevance of the AGN/BHXRB connection to blazar variability.

  19. The Host Galaxies and Narrow Line Regions of Four Double-Peaked [OIII] AGN

    E-Print Network [OSTI]

    Villforth, C

    2015-01-01T23:59:59.000Z

    Major gas-rich mergers of galaxies are expected to play an important role in triggering and fuelling luminous AGN. We present deep multi-band (u/r/z) imaging and long slit spectroscopy of four double-peaked [OIII] emitting AGN, a class of objects associated with either kcp-separated binary AGN or final stage major mergers, though AGN with complex narrow-line regions are known contaminants. Such objects are of interest since they represent the onset of AGN activity during the merger process. Three of the objects studied have been confirmed as major mergers using near-infrared imaging, one is a confirmed X-ray binary AGN. All AGN are luminous and have redshifts of 0.1 < z < 0.4. Deep r-band images show that a majority (3/4) of the sources have disturbed host morphologies and tidal features, while the remaining source is morphologically undisturbed down to low surface brightness limits. The lack of morphological disturbances in this galaxy despite the fact that is is a close binary AGN suggests that the me...

  20. Discovery of an ultrasoft transient ROSAT AGN: WPVS007

    E-Print Network [OSTI]

    D. Grupe; K. Beuermann; K. Mannheim; H. -C. Thomas; D. deMartino; H. H. Fink

    1995-06-14T23:59:59.000Z

    We have identified the ROSAT source RX J0039.2-5117 with the previously almost unknown `narrow line' Seyfert 1 galaxy WPVS007 (z=0.028). The X-ray source displays quite unusual properties for an AGN. It was bright and ultrasoft in the ROSAT All-Sky Survey (RASS) and found at a level lower by a factor of ~ 400 in PSPC count rate in 1993. The implied 0.1-2.4 keV luminosity during the RASS was ~ 10^{37} W. We discuss possible explanations for the extremely soft X-ray spectrum and the observed variability.

  1. BRIEFING NOTES November 2010

    E-Print Network [OSTI]

    Mound, Jon

    and EU, have promoted biofuel advancement which has #12;Briefing Note. November 2010. SustainableBRIEFING NOTES November 2010 Sustainable biofuels in Africa: cultivation of Jatropha curcas in Mali Background Case study 1 - Mali Case study 2 - Malawi Policy recommendations Biofuel cultivation worldwide

  2. Images clockwise: Leonid Tishkov Private Moon, Agnes Meyer-Brandis, Moon Goose Analogue and Liliane Lijn, The Arts Catalyst present

    E-Print Network [OSTI]

    Zharkova, Valentina V.

    Images clockwise: Leonid Tishkov Private Moon, Agnes Meyer-Brandis, Moon Goose Analogue and Liliane.artscatalyst.org/moon Agnes Meyer-Brandis | Katie Paterson | Liliane Lijn | Leonid Tishkov | WE COLONISED THE MOON | Moon international artists including Liliane Lijn, Leonid Tishkov, Katie Paterson, Agnes Meyer Brandis and WE

  3. AGN Environments in the Sloan Digital Sky Survey I: Dependence on Type, Redshift, and Luminosity

    E-Print Network [OSTI]

    Natalie E. Strand; Robert J. Brunner; Adam D. Myers

    2008-07-24T23:59:59.000Z

    We explore how the local environment is related to the redshift, type, and luminosity of active galactic nuclei (AGN). Recent simulations and observations are converging on the view that the extreme luminosity of quasars is fueled in major mergers of gas-rich galaxies. In such a picture, quasars are expected to be located in regions with a higher density of galaxies on small scales where mergers are more likely to take place. However, in this picture, the activity observed in low-luminosity AGN is due to secular processes that are less dependent on the local galaxy density. To test this hypothesis, we compare the local photometric galaxy density on kiloparsec scales around spectroscopic Type I and Type II quasars to the local density around lower luminosity spectroscopic Type I and Type II AGN. To minimize projection effects and evolution in the photometric galaxy sample we use to characterize AGN environments, we place our random control sample at the same redshift as our AGN and impose a narrow redshift window around both the AGN and control targets. We find that higher luminosity AGN have more overdense environments compared to lower luminosity AGN on all scales out to our $2\\Mpchseventy$ limit. Additionally, in the range $0.3\\leqslant z\\leqslant 0.6$, Type II quasars have similarly overdense environments to those of bright Type I quasars on all scales out to our $2\\Mpchseventy$ limit, while the environment of dimmer Type I quasars appears to be less overdense than the environment of Type II quasars. We see increased overdensity for Type II AGN compared to Type I AGN on scales out to our limit of $2\\Mpchseventy$ in overlapping redshift ranges. We also detect marginal evidence for evolution in the number of galaxies within $2\\Mpchseventy$ of a quasar with redshift.

  4. Simulations of the OzDES AGN Reverberation Mapping Project

    E-Print Network [OSTI]

    King, Anthea L; Davis, Tamara M; Denney, K D; Kochanek, C S; Peterson, Bradley M; Skielboe, Andreas; Vestergaard, Marianne; Huff, Eric; Watson, Darach; Banerji, Manda; McMahon, Richard; Sharp, Rob; Lidman, C

    2015-01-01T23:59:59.000Z

    As part of the OzDES spectroscopic survey we are carrying out a large scale reverberation mapping study of $\\sim$500 quasars over five years in the 30 deg$^2$ area of the Dark Energy Survey (DES) supernova fields. These quasars have redshifts ranging up to 4 and have apparent AB magnitudes between $16.8AGN and constrain the radius-luminosity ($R-L$) relationship. Here we investigate the expected efficiency of the OzDES reverberation mapping campaign and its possible extensions. We expect to recover lags for $\\sim$35-45\\% of the quasars. AGN with shorter lags and greater variability are more likely to yield a lag, and objects with lags $\\lesssim$6 month or $\\sim$1 year are expected be recovered the most accurately. The baseline OzDES reverberation mapping campaign is predicted to produce an ...

  5. Cooling, AGN Feedback and Star Formation in Simulated Cool-Core Galaxy Clusters

    E-Print Network [OSTI]

    Li, Yuan; Ruszkowski, Mateusz; Voit, G Mark; O'Shea, Brian W; Donahue, Megan

    2015-01-01T23:59:59.000Z

    Numerical simulations of active galactic nuclei (AGN) feedback in cool-core galaxy clusters have successfully avoided classical cooling flows, but often produce too much cold gas. We perform adaptive mesh simulations that include momentum-driven AGN feedback, self-gravity, star formation and stellar feedback, focusing on the interplay between cooling, AGN heating and star formation in an isolated cool-core cluster. Cold clumps triggered by AGN jets and turbulence form filamentary structures tens of kpc long. This cold gas feeds both star formation and the supermassive black hole (SMBH), triggering an AGN outburst that increases the entropy of the ICM and reduces its cooling rate. Within 1-2 Gyr, star formation completely consumes the cold gas, leading to a brief shutoff of the AGN. The ICM quickly cools and redevelops multiphase gas, followed by another cycle of star formation/AGN outburst. Within 6.5 Gyr, we observe three such cycles. There is good agreement between our simulated cluster and the observations...

  6. AGN Clustering in the Local Universe: An Unbiased Picture from Swift-BAT

    SciTech Connect (OSTI)

    Cappelluti, N.; /Garching, Max Planck Inst., MPE; Ajello, M.; /SLAC /KIPAC, Menlo Park; Burlon, D.; /Garching, Max Planck Inst., MPE; Krumpe, M.; /San Diego, CASS; Miyaji, T.; /Observ. Astron. Natl., Ensenada; Bonoli, S.; /Garching, Max Planck Inst.; Greiner, J.; /Garching, Max Planck Inst., MPE

    2011-08-11T23:59:59.000Z

    We present the clustering measurement of hard X-ray selected AGN in the local Universe. We used a sample of 199 sources spectroscopically confirmed detected by Swift-BAT in its 15-55 keV all-sky survey. We measured the real space projected auto-correlation function and detected a signal significant on projected scales lower than 200 Mpc/h. We measured a correlation length of r{sub 0} = 5.56{sup +0.49}{sub -0.43} Mpc/h and a slope {gamma} = 1.64{sup -0.08}{sub -0.07}. We also measured the auto-correlation function of Tyep I and Type II AGN and found higher correlation length for Type I AGN. We have a marginal evidence of luminosity dependent clustering of AGN, as we detected a larger correlation length of luminous AGN than that of low luminosity sources. The corresponding typical host DM halo masses of Swift-BAT are {approx} log(M{sub DMH) {approx} 12-14 h{sup -1}M/M{sub {circle_dot}} which is the typical mass of a galaxy group. We estimated that the local AGN population has a typical lifetime {tau}{sub AGN} {approx}0.7 Gyr, it is powered by SMBH with mass M{sub BH} {approx}1-10x10{sup 8} M{sub {circle_dot}} and accreting with very low efficiency, log({epsilon}){approx}-2.0>. We also conclude that local AGN galaxies are typically red-massive galaxies with stellar mass of the order 2-80x10{sup 10} h{sup -1}M{sub {circle_dot}}. We compared our results with clustering predictions of merger-driven AGN triggering models and found a good agreement.

  7. Does Dissipation in AGN Disks Couple to the Total Pressure?

    E-Print Network [OSTI]

    E. T. Vishniac

    1993-08-12T23:59:59.000Z

    Recent work on the transport of angular momentum in accretion disks suggests that the Velikhov-Chandrasekhar instability, in which a large scale magnetic field generates small scale eddys in a shearing environment, may be ultimately responsible for this process. Although there is considerable controversy about the origin and maintenance of this field in accretion disks, it turns out that it is possible to argue, quite generally, using scaling arguments, that this process is sensitive to the total pressure in an AGN disk, rather than the pressure contributed by gas alone. We conclude that the resolution of the conceptual difficulties implied by the presence of strong thermal and viscous instabilities in radiation pressure and electron scattering dominated does not lie in models that couple the total dissipation rate to the gas pressure alone, or to some weighted mean of the gas and radiation pressures.

  8. Optical Spectroscopic ATLAS of the MOJAVE/2cm AGN Sample

    E-Print Network [OSTI]

    Torrealba, Janet; Cruz-González, Irene; Arshakian, Tigran G; Bertone, Emanuele; Rosa-González, Daniel

    2011-01-01T23:59:59.000Z

    We present an optical spectroscopic atlas at intermediate resolution (8 -15 A) for 124 core-dominated radio-loud active galactic nuclei with relativistic jets, drawn from the MOJAVE/2cm sample at 15GHz. It is the first time that spectroscopic and photometric parameters for a large sample of such type of AGN are presented. The atlas includes spectral parameters for the emission lines Hbeta, [O III] 5007, Mg II 2798 and/or C IV 1549 and corresponding data for the continuum, as well as the luminosities and equivalent widths of the Fe II UV/optical. It also contains the homogeneous photometric information in the B-band for 242 sources of the sample, with a distribution peak at BJ=18.0 and a magnitude interval of 11.1< BJ <23.7.

  9. Relativistic Effects on Reflection X-ray Spectra of AGN

    SciTech Connect (OSTI)

    Lee, Khee-Gan; /University Coll. London; Fuerst, Steven V.; /KIPAC, Menlo Park; Brandwardi-Raymond, Graziella; Wu, Kinwah; Crowley, Oliver; /University Coll. London

    2007-01-05T23:59:59.000Z

    We have calculated the reflection component of the X-ray spectra of active galactic nuclei (AGN) and shown that they can be significantly modified by the relativistic motion of the accretion flow and various gravitational effects of the central black hole. The absorption edges in the reflection spectra suffer severe energy shifts and smearing. The degree of distortion depends on the system parameters, and the dependence is stronger for some parameters such as the inner radius of the accretion disk and the disk viewing inclination angles. The relativistic effects are significant and are observable. Improper treatment of the reflection component of the X-ray continuum in spectral fittings will give rise to spurious line-like features, which will mimic the fluorescent emission lines and mask the relativistic signatures of the lines.

  10. IC5063: AGN driven outflow of warm and cold gas

    E-Print Network [OSTI]

    R. Morganti; J. Holt; L. Saripalli; T. A. Oosterloo; C. N. Tadhunter

    2007-10-05T23:59:59.000Z

    We present new ATCA 17- and 24-GHz radio images and ESO-NTT optical spectra of the radio-loud Seyfert galaxy IC5063, the first galaxy in which a fast (~ 600 km/s) outflow of neutral hydrogen was discovered. The new radio data confirm the triple radio structure with a central core and two resolved radio lobes. This implies that the previously detected fast outflow of neutral gas is occurring off-nucleus, near a radio lobe about 0.5 kpc from the core. The ionised gas shows complex kinematics in the region co-spatial with the radio emission. Broad and blueshifted (~ 500 km/s) emission is observed in the region of the radio lobe, at the same location as the blueshifted HI absorption. The velocity of the ionised outflow is similar to the one found in HI. The first order correspondence between the radio and optical properties suggests that the outflow is driven by the interaction between the radio jet and the ISM. Despite the high outflow velocities, no evidence is found for the ionisation of the gas being due to fast shocks in the region of the outflow, indicating that photoionisation from the AGN is likely to be the dominant ionisation mechanism. The outflow rate of the warm (ionised) gas is small compared to that of the cold gas. The mass outflow rate associated with the HI is in the same range as for ``mild'' starburst-driven superwinds in ULIRGs. However, in IC5063, the AGN-driven outflow appears to be limited to the inner kpc region of the galaxy. The kinetic power associated with the HI outflow is a small fraction (a few x 10^-4) of the Eddington luminosity of the galaxy but is a significant fraction (~ 0.1) of the nuclear bolometric luminosity. In IC5063, the outflows may have sufficient kinetic power to have a significant impact on the evolution of the ISM in the host galaxy.

  11. What Can We Learn from the Smallest AGN?

    E-Print Network [OSTI]

    Ari Laor

    2007-02-21T23:59:59.000Z

    Quite a few things. In particular, reverberation mapping of NGC 4395, the lowest luminosity type 1 Active Galactic Nucleus (AGN, L_bol~10^40 erg/s) revealed a size of only ~1 light hour for the C IV broad line region (BLR), which is by far the smallest BLR. This, together with a similar determination of a size of ~200 light days in a luminous quasar (Kaspi et al. 2007), suggests that the R_BLR\\propto L^1/2 relation holds over a range of 10^7 in L. This relation was suggested to result from dust sublimation, which sets R_BLR. This suggestion was beautifully confirmed recently by the dust reverberation results of Suganuma et al. (2006). The R_BLR\\propto L^1/2 relation implies that the broad lines width increases with decreasing luminosity according to v\\propto L^-1/4. But, there is an observational cutoff at v~25,000 km/s, and thus below a certain threshold L the BLR would not be detectable. Such objects constitute the so-called "true type 2" AGN (e.g. most FR I radio galaxies). The physical origin of the BLR gas is not established yet, but high quality Keck spectra of the Halpha profile in NGC 4395 rule out a clumped distribution, and indicate that the gas resides in a smooth flow, most likely in a thick rotationally supported configuration. The Halpha line also reveals extended exponential wings, which are well modeled by electron scattering within the BLR emitting gas. Such wings can be used as a direct probe of the BLR temperature and optical depth.

  12. What controls the [O III] 5007 line strength in AGN?

    E-Print Network [OSTI]

    Alexei Baskin; Ari Laor

    2005-02-22T23:59:59.000Z

    AGN display an extreme range in the narrow emission line equivalent widths. Specifically, in the PG quasar sample the equivalent width of the narrow [O III] 5007 line has a range of >300, while the broad Hb line, for example, has a range of 10 only. The strength of [O III] 5007 is modulated by the covering factor, CF, of the narrow line region (NLR) gas, its density n_e, and ionization parameter U. To explore which of these factors produces the observed large range in [O III] 5007 strength, we measure the strength of the matching narrow Hb and [O III] 4363 lines, detected in 40 out of the 87 z<0.5 PG quasars in the Boroson & Green sample. The photoionization code CLOUDY is then used to infer CF, n_e, and U in each object, assuming a single uniform emitting zone. We find that the range of CF (~0.02-0.2) contributes about twice as much as the range in both n_e and U towards modulating the strength of the [O III] 5007 line. The CF is inversely correlated with luminosity, but it is not correlated with L_Edd as previously speculated. The single zone [O III] 5007 emitting region is rather compact, having R=40L_44^0.45 pc. These emission lines can also be fit with an extreme two zone model, where [O III] 4363 is mostly emitted by a dense (n_e=10^7) inner zone at R=L_44^0.5 pc, and [O III] 5007 by a low density (n_e=10^3) extended outer zone at R=750L_44^0.34 pc. Such an extended [O III] 5007 emission should be well resolved by HST imaging of luminous AGN. Further constraints on the radial gas distribution in the NLR can be obtained from the spectral shape of the IR continuum emitted by the associated dust.

  13. A diversity of dusty AGN tori: Data release for the VLTI/MIDI AGN Large Program and first results for 23 galaxies

    E-Print Network [OSTI]

    Burtscher, Leonard; Tristram, Konrad R W; Jaffe, Walter; Hönig, Sebastian F; Davies, Richard I; Kishimoto, Makoto; Pott, Jörg-Uwe; Röttgering, Huub; Schartmann, Marc; Weigelt, Gerd; Wolf, Sebastian

    2013-01-01T23:59:59.000Z

    The AGN-heated dust distribution (the "torus") is increasingly recognized not only as the absorber required in unifying models, but as a tracer for the reservoir that feeds the nuclear Super-Massive Black Hole. Yet, even its most basic structural properties (such as its extent, geometry and elongation) are unknown for all but a few archetypal objects. Since most AGNs are unresolved in the mid-infrared, we utilize the MID-infrared interferometric Instrument (MIDI) at the Very Large Telescope Interferometer (VLTI) that is sensitive to structures as small as a few milli-arcseconds (mas). We present here an extensive amount of new interferometric observations from the MIDI AGN Large Program (2009 - 2011) and add data from the archive to give a complete view of the existing MIDI observations of AGNs. Additionally, we have obtained high-quality mid-infrared spectra from VLT/VISIR. We present correlated and total flux spectra for 23 AGNs and derive flux and size estimates at 12 micron using simple axisymmetric geome...

  14. Discovery of 10 micron silicate emission in quasars. Evidence of the AGN unification scheme

    E-Print Network [OSTI]

    R. Siebenmorgen; M. Haas; E. Kr"ugel; B. Schulz

    2005-04-12T23:59:59.000Z

    According to the unified scheme, AGN are surrounded by a dust-torus, and the observed diversity of AGN properties results from the different orientations relative to our line of sight. The strong resonance of silicate dust at 10 micron is therefore, as expected, seen in absorption towards many type-2 AGN. In type-1 AGN, it should be seen in emission because the hot inner surface of the dust torus becomes visible. However, this has not been observed so far, thus challenging the unification scheme or leading to exotic modifications of the dust-torus model. Here we report the discovery of the 10 micron silicate feature in emission in two luminous quasars with the Infrared Spectrograph of the Spitzer Space Telescope.

  15. all-sky survey agn: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    sky coverage each orbit, and full sky coverage each 50 days, hard x-ray studies of gamma-ray bursts, AGN, galactic transients, x-ray binaries and accretion-powered pulsars can be...

  16. Constraints on black hole fuelling modes from the clustering of X-ray AGN

    E-Print Network [OSTI]

    Fanidakis, N; Mountrichas, G; Krumpe, M; Baugh, C M; Lacey, C G; Frenk, C S; Miyaji, T; Benson, A J

    2013-01-01T23:59:59.000Z

    We present a clustering analysis of X-ray selected AGN by compiling X-ray samples from the literature and re-estimating the dark matter (DM) halo masses of AGN in a uniform manner. We find that moderate luminosity AGN (Lx(2-10 keV)=10^42-10^44 erg/sec) in the z=0-1.3 Universe are typically found in DM haloes with masses of ~10^13 Msun. We then compare our findings to the theoretical predictions of the coupled galaxy and black hole formation model GALFORM. We find good agreement when our calculation includes the hot-halo mode of accretion onto the central black hole. This type of accretion, which is additional to the common cold accretion during disk instabilities and galaxy mergers, is tightly coupled to the AGN feedback in the model. The hot-halo mode becomes prominent in DM haloes with masses greater than ~10^12.5 Msun, where AGN feedback typically operates, giving rise to a distinct class of moderate luminosity AGN that inhabit rich clusters and superclusters. Cold gas fuelling of the black hole cannot pro...

  17. AGN clustering in the local Universe: an unbiased picture from Swift-BAT

    E-Print Network [OSTI]

    Cappelluti, N; Burlon, D; Krumpe, M; Miyaji, T; Bonoli, S; Greiner, J

    2010-01-01T23:59:59.000Z

    We present the clustering measurement of hard X-ray selected AGN in the local Universe. We used a sample of 199 sources spectroscopically confirmed detected by Swift-BAT in its 15-55 keV all-sky survey. We measured the real space projected auto-correlation function and detected a signal significant on projected scales lower than 200 Mpc/h. We measured a correlation length of r0=5.56+0.49-0.43 Mpc/h and a slope {\\gamma}=1.64-0.08 -0.07. We also measured the auto-correlation function of Type I and Type II AGN and found higher correlation length for Type I AGN. We have a marginal evidence of luminosity dependent clustering of AGN, as we detected a larger correlation length of luminous AGN than that of low luminosity sources. The corresponding typical host DM halo masses of Swift-BAT are log(MDMH) 12-14 h^-1 M/M_sun, depending on the subsample. For the whole sample we measured log(MDMH)\\sim 13.15 h-1 M/M_sun which is the typical mass of a galaxy group. We estimated that the local AGN population has a typical life...

  18. On the Anomalous Silicate Emission Features of AGNs: A Possible Interpretation Based on Porous Dust

    E-Print Network [OSTI]

    M. P. Li; Q. J. Shi; Aigen Li

    2008-08-29T23:59:59.000Z

    The recent Spitzer detections of the 9.7 micron Si--O silicate emission in type 1 AGNs provide support for the AGN unification scheme. The properties of the silicate dust are of key importance to understanding the physical, chemical and evolutionary properties of the obscuring dusty torus around AGNs. Compared to that of the Galactic interstellar medium (ISM), the 10 micron silicate emission profile of type 1 AGNs is broadened and has a clear shift of peak position to longer wavelengths. In literature this is generally interpreted as an indication of the deviations of the silicate composition, size, and degree of crystallization of AGNs from that of the Galactic ISM. In this Letter we show that the observed peak shift and profile broadening of the 9.7 micron silicate emission feature can be explained in terms of porous composite dust consisting of ordinary interstellar amorphous silicate, amorphous carbon and vacuum. Porous dust is naturally expected in the dense circumnuclear region around AGNs, as a consequence of grain coagulation.

  19. Editor's Note: Hurricane Sandy,

    E-Print Network [OSTI]

    Rosen, Jay

    Editor's Note: Hurricane Sandy, also known as Super Storm Sandy, Tropi- cal Storm Sandy, or just to protect the public, vital infrastructure, and the environment. Hurricane Sandy When Joseph Bruno, New York- nuity that the city demonstrated in the wake of Hurricane Sandy. So when he addressed a forum at New

  20. Computer Engineering Curriculum Notes

    E-Print Network [OSTI]

    Mather, Patrick T.

    1 Computer Engineering Curriculum Notes 2013-2014 Technical Electives Students fulfill 15 credits be assigned to either group A or group B as determined by Computer Engineering program committee. Every year the computer engineering program committee will review the list and may make change(s). Group A (at least 6

  1. ELECTRICAL ENGINEERING Curriculum Notes

    E-Print Network [OSTI]

    Mather, Patrick T.

    ELECTRICAL ENGINEERING Curriculum Notes 2013-2014 1. Electrical Engineering (EE) students must/programs/electrical_engineering) and minors are used to regulate technical electives. A student must complete four technical elective courses in Electrical Engineering or Computer Engineering. At a minimum

  2. Climate VISION: Security and Privacy Notices

    Office of Scientific and Technical Information (OSTI)

    SECURITY AND PRIVACY NOTICES Security Notice This website is part of a Federal computer system used to accomplish Federal functions. The Department of Energy uses software programs...

  3. Electricity Advisory Committee Notice of Open Teleconference...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    January 24 2014: Federal Register Notice Volume 78, No. 246 - December 23, 2013 Electricity Advisory Committee Notice of Open Teleconference January 24 2014: Federal Register...

  4. Preliminary Notice of Violation, National Security Technologies...

    Office of Environmental Management (EM)

    Preliminary Notice of Violation, National Security Technologies, LLC - NEA-2011-03 Preliminary Notice of Violation, National Security Technologies, LLC - NEA-2011-03 August 11,...

  5. Frying Doughnuts: What can the reprocessing of X-rays to IR tell us about the AGN environment?

    E-Print Network [OSTI]

    B. McKernan; K. E. S. Ford; N. Chang; C. S. Reynolds

    2008-12-04T23:59:59.000Z

    Active galactic nuclei (AGN) produce vast amounts of high energy radiation deep in their central engines. X-rays either escape the AGN or are absorbed and re-emitted mostly as IR. By studying the dispersion in the ratio of observed mid-IR luminosity to observed 2-10keV X-ray luminosity (R_{ir/x}) in AGN we can investigate the reprocessing material (possibly a torus or donut of dust) in the AGN central engine, independent of model assumptions. We studied the ratio of observed mid-IR and 2-10keV X-ray luminosities in a heterogeneous sample of 245 AGN from the literature. We found that when we removed AGN with prominent jets, ~90% of Type I AGN lay within a very tight dispersion in luminosity ratio (1cloud cover, turbulent disk, opening angle of absorbing structures such as dusty tori) must span a very narrow range of parameters. We also found that the far-IR(100um) to mid-IR (12um) observed luminosity ratio is an effective descriminator between heavily obscured AGN and relatively unobscured AGN.

  6. Particle acceleration in rotating and shearing jets from AGN

    E-Print Network [OSTI]

    F. M. Rieger; K. Mannheim

    2002-10-14T23:59:59.000Z

    We model the acceleration of energetic particles due to shear and centrifugal effects in rotating astrophysical jets. The appropriate equation describing the diffusive transport of energetic particles in a collisionless, rotating background flow is derived and analytical steady state solutions are discussed. In particular, by considering velocity profiles from rigid, over flat to Keplerian rotation, the effects of centrifugal and shear acceleration of particles scattered by magnetic inhomogeneities are distinguished. In the case where shear acceleration dominates, it is confirmed that power law particle momentum solutions $f(p) \\propto p^{-(3+\\alpha)}$ exist, if the mean scattering time $\\tau_c \\propto p^{\\alpha}$ is an increasing function of momentum. We show that for a more complex interplay between shear and centrifugal acceleration, the recovered power law momentum spectra might be significantly steeper but flatten with increasing azimuthal velocity due to the increasing centrifugal effects. The possible relevance of shear and centrifugal acceleration for the observed extended emission in AGN is demonstrated for the case of the jet in the quasar 3C273.

  7. Briefing notes on MPhils

    E-Print Network [OSTI]

    Runde, Jochen

    2009-07-13T23:59:59.000Z

    staff.’ (extract from BP internal report) The CMI MPhil initiative is also serving as an agent of change within Cambridge University. Successes on this front include: great strides in the development of the platform-sharing model (e.g. all CMI... BRIEFING NOTE Professional Practice MPhil Programmes developed under the aegis of CMI CMI has sponsored the development of a number of new MPhils at Cambridge, inspired by the successful ‘Professional Practice’ programmes at MIT. It is the multi...

  8. Electricity Advisory Committee Notice of Open Meeting July 12...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    July 12, 2011: Federal Register Notice Volume 76, No. 122 - Jun. 24, 2011 Electricity Advisory Committee Notice of Open Meeting July 12, 2011: Federal Register Notice Volume 76,...

  9. EIS-0424: EPA Notice of Availability of the Draft Environmental...

    Broader source: Energy.gov (indexed) [DOE]

    Notice of Cancellation of an Environmental Impact Statement EIS-0365: EPA Notice of Availability of the Final Environmental Impact Statement EIS-0472: EPA Notice of Availability of...

  10. EIS-0414: DOE Notice of Availability of the Draft Environmental...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    DOE Notice of Availability of the Draft Environmental Impact Statement and Notice of Public Hearing EIS-0414: DOE Notice of Availability of the Draft Environmental Impact Statement...

  11. HOST GALAXIES, CLUSTERING, EDDINGTON RATIOS, AND EVOLUTION OF RADIO, X-RAY, AND INFRARED-SELECTED AGNs

    SciTech Connect (OSTI)

    Hickox, Ryan C.; Jones, Christine; Forman, William R.; Murray, Stephen S.; Brodwin, Mark; Narayan, Ramesh; Kenter, Almus; Caldwell, Nelson; Anderson, Michael E. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Kochanek, Christopher S. [Department of Astronomy and Center for Cosmology and Astroparticle Physics, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210-1173 (United States); Eisenstein, Daniel [Steward Observatory, 933 North Cherry Avenue, Tucson, AZ 85721 (United States); Jannuzi, Buell T.; Dey, Arjun [National Optical Astronomy Observatory, Tucson, AZ 85726-6732 (United States); Brown, Michael J. I. [School of Physics, Monash University, Clayton 3800, Victoria (Australia); Stern, Daniel; Eisenhardt, Peter R.; Gorjian, Varoujan [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States); Cool, Richard J. [Princeton University Observatory, Peyton Hall, Princeton, NJ 08544-1001 (United States)], E-mail: rhickox@cfa.harvard.edu

    2009-05-01T23:59:59.000Z

    We explore the connection between different classes of active galactic nuclei (AGNs) and the evolution of their host galaxies, by deriving host galaxy properties, clustering, and Eddington ratios of AGNs selected in the radio, X-ray, and infrared (IR) wavebands. We study a sample of 585 AGNs at 0.25 < z < 0.8 using redshifts from the AGN and Galaxy Evolution Survey (AGES). We select AGNs with observations in the radio at 1.4 GHz from the Westerbork Synthesis Radio Telescope, X-rays from the Chandra XBooetes Survey, and mid-IR from the Spitzer IRAC Shallow Survey. The radio, X-ray, and IR AGN samples show only modest overlap, indicating that to the flux limits of the survey, they represent largely distinct classes of AGNs. We derive host galaxy colors and luminosities, as well as Eddington ratios, for obscured or optically faint AGNs. We also measure the two-point cross-correlation between AGNs and galaxies on scales of 0.3-10 h {sup -1} Mpc, and derive typical dark matter halo masses. We find that: (1) radio AGNs are mainly found in luminous red sequence galaxies, are strongly clustered (with M {sub halo} {approx} 3 x 10{sup 13} h {sup -1} M {sub sun}), and have very low Eddington ratios {lambda} {approx}< 10{sup -3}; (2) X-ray-selected AGNs are preferentially found in galaxies that lie in the 'green valley' of color-magnitude space and are clustered similar to the typical AGES galaxies (M {sub halo} {approx} 10{sup 13} h {sup -1} M {sub sun}), with 10{sup -3} {approx}< {lambda} {approx}< 1; (3) IR AGNs reside in slightly bluer, slightly less luminous galaxies than X-ray AGNs, are weakly clustered (M {sub halo} {approx}< 10{sup 12} h {sup -1} M {sub sun}), and have {lambda}>10{sup -2}. We interpret these results in terms of a simple model of AGN and galaxy evolution, whereby a 'quasar' phase and the growth of the stellar bulge occurs when a galaxy's dark matter halo reaches a critical mass between {approx}10{sup 12} and 10{sup 13} M {sub sun}. After this event, star formation ceases and AGN accretion shifts from radiatively efficient (optical- and IR-bright) to radiatively inefficient (optically faint, radio-bright) modes.

  12. Looking below the floor: constraints on the AGN radio luminosity functions at low power

    E-Print Network [OSTI]

    Capetti, Alessandro

    2015-01-01T23:59:59.000Z

    We constrain the behavior of the radio luminosity function (RLF) of two classes of active galactic nuclei (AGN) namely AGN of low radio power (LRP) and BL Lac objects. The extrapolation of the observed steep RLFs to low power predicts a space density of such objects that exceeds that of the sources that can harbor them and this requires a break to a shallower slope. For LRP AGN we obtain P_br,LRP > 10^20.5 W/Hz at 1.4 GHz to limit their density to be smaller than that of elliptical galaxies with black hole masses M_BH > 10^7.5 solar masses. By combining this value with the limit derived by the observations the break must occur at P_br,LRP~10^20.5-10^21.5 W/Hz. For BL Lacs we find P_br,BLLAC > 10^23.3 W/Hz otherwise they would outnumber the density of weak-lined and compact radio sources, while the observations indicate P_br,BLLAC < 10^24.5 W/Hz. In the framework of the AGN unified model a low luminosity break in the RLF of LRP AGN must correspond to a break in the RLF of BL Lacs. The ratio between P_br,LRP...

  13. Heavily Obscured AGN in Star-Forming Galaxies at z~2

    E-Print Network [OSTI]

    Treister, E; Schawinski, K; Urry, C M; Gawiser, E; Virani, S; Lira, P; Kartaltepe, J; Damen, M; Taylor, E N; Le Floc'h, E; Justham, Stephen; Koekemoer, A

    2009-01-01T23:59:59.000Z

    We study the properties of a sample of 211 heavily-obscured Active Galactic Nucleus (AGN) candidates in the Extended Chandra Deep Field-South selecting objects with f_24/f_R>1000 and R-K>4.5. Of these, 18 were detected in X-rays and found to be obscured AGN with neutral hydrogen column densities of ~10^23 cm^-2. In the X-ray undetected sample, the following evidence suggests a large fraction of heavily-obscured (Compton Thick) AGN: (i) The stacked X-ray signal of the sample is strong, with an observed ratio of soft to hard X-ray counts consistent with a population of ~90% heavily obscured AGN combined with 10% star-forming galaxies. (ii) The X-ray to mid-IR ratios for these sources are significantly larger than that of star-forming galaxies and ~2 orders of magnitude smaller than for the general AGN population, suggesting column densities of N_H>5x10^24 cm^-2. (iii) The Spitzer near- and mid-IR colors of these sources are consistent with those of the X-ray-detected sample if the effects of dust self-absorptio...

  14. Submillimetre observations of WISE/radio-selected AGN and their environments

    E-Print Network [OSTI]

    Jones, Suzy F; Lonsdale, Carol; Condon, James; Farrah, Duncan; Stern, Daniel; Tsai, Chao-Wei; Assef, Roberto J; Bridge, Carrie; Kimball, Amy; Lacy, Mark; Eisenhardt, Peter; Wu, Jingwen; Jarrett, Tom

    2015-01-01T23:59:59.000Z

    We present JCMT SCUBA-2 850microns submillimetre (submm) observations of 30 mid-infrared (mid-IR) luminous AGN, detected jointly by the WISE all-sky IR survey and the NVSS/FIRST radio survey. These rare sources are selected by their extremely red mid-infrared spectral energy distributions (SEDs) and compact radio counterparts. Further investigations show that they are highly obscured, have abundant warm AGN-heated dust and are thought to be experiencing intense AGN feedback. These galaxies appear to be consistent with an AGN-dominated galaxy, and could be a transient phase of merging galaxies. When comparing the number of submm galaxies (SMGs) detected serendipitously in the surrounding 1.5-arcmin to those in blank-field submm surveys, there is a very significant overdensity, of order 5, but no sign of radial clustering centred at our primary objects. The WISE/radio-selected AGN thus reside in 10-Mpc-scale overdense environments, that could be forming in pre-viralised clusters of galaxies. WISE/radio-selected...

  15. 9.7 um Silicate Features in AGNs: New Insights into Unification Models

    E-Print Network [OSTI]

    Y. Shi; G. H. Rieke; D. C. Hines; V. Gorjian; M. W. Werner; K. Cleary; F. J. Low; P. S. Smith; J. Bouwman

    2006-12-15T23:59:59.000Z

    We describe observations of 9.7 um silicate features in 97 AGNs, exhibiting a wide range of AGN types and of X-ray extinction toward the central nuclei. We find that the strength of the silicate feature correlates with the HI column density estimated from fitting the X-ray data, such that low HI columns correspond to silicate emission while high columns correspond to silicate absorption. The behavior is generally consistent with unification models where the large diversity in AGN properties is caused by viewing-angle-dependent obscuration of the nucleus. Radio-loud AGNs and radio-quiet quasars follow roughly the correlation between HI columns and the strength of the silicate feature defined by Seyfert galaxies. The agreement among AGN types suggests a high-level unification with similar characteristics for the structure of the obscuring material. We demonstrate the implications for unification models qualitatively with a conceptual disk model. The model includes an inner accretion disk (< 0.1 pc in radius), a middle disk (0.1-10 pc in radius) with a dense diffuse component and with embedded denser clouds, and an outer clumpy disk (10-300 pc in radius).

  16. Optical, UV, and X-ray Clues to the Nature of Narrow Line AGNs

    E-Print Network [OSTI]

    Ari Laor

    2000-05-08T23:59:59.000Z

    AGNs with narrow Balmer lines show various extreme properties. In particular, rapid X-ray variability, steep X-ray spectra, peculiar optical and UV line ratios, and possibly peculiar line profiles. Since all these phenomena occur together they are likely to be related to one specific underlying physical parameter. I review recent evidence, based on HST imaging of low z quasars, which suggests that the H-beta line width and continuum luminosity of quasars provide a reasonably accurate estimate of the black hole mass. This implies that narrow-line AGN have relatively low black hole masses, and thus high L/L_Edd, as independently suggested based on their steep X-ray spectra. I present additional evidence suggesting that the X-ray variability and the radio loudness are primarily driven by the black hole mass. The high mass inflow rate into the core of narrow-line AGNs may produce a denser and more enriched BLR, a high column radiation pressure driven outflow, and a smaller illumination angle for the NLR, as suggested by the observed emission line properties. Narrow-line AGNs may thus provide important clues for understanding the rich overall phenomenology of AGNs.

  17. Parsec-scale dust distributions in Seyfert galaxies - Results of the MIDI AGN snapshot survey

    E-Print Network [OSTI]

    Tristram, Konrad R W; Meisenheimer, Klaus; Jaffe, Walter; Röttgering, Huub; Burtscher, Leonard; Cotton, William D; Graser, Uwe; Henning, Thomas; Leinert, Christoph; Lopez, Bruno; Morel, Sébastien; Perrin, Guy; Wittkowski, Markus

    2009-01-01T23:59:59.000Z

    The emission of warm dust dominates the mid-infrared spectra of active galactic nuclei (AGN). Only interferometric observations provide the necessary angular resolution to resolve the nuclear dust and study its distribution and properties. The investigation of dust in AGN cores is hence one of the main science goals for the MID-infrared interferometric Instrument MIDI at the VLTI. In a first step, the feasibility of AGN observations was verified and the most promising sources for detailed studies were identified. To this end, we carried out a "snapshot survey" with MIDI using Guaranteed Time Observations. In the survey, observations were attempted for 13 of the brightest AGN in the mid-infrared, which are visible from Paranal. The results of the three brightest sources have been published in separate papers. Here we present the interferometric observations for the remaining 10, fainter AGN. For 8 of these, interferometric measurements could be carried out. Size estimates or limits on the spatial extent of the...

  18. The ISO-2MASS AGN survey: On the type-1 sources

    E-Print Network [OSTI]

    C. Leipski; M. Haas; H. Meusinger; R. Siebenmorgen; R. Chini; C. M. Scheyda; M. Albrecht; B. J. Wilkes; J. P. Huchra; S. Ott; C. Cesarsky; R. Cutri

    2005-07-13T23:59:59.000Z

    We combined the ISOCAM Parallel Mode Survey at 6.7 micron (LW2 filter) with the Two Micron All Sky Survey in order to obtain a powerful tool to search for AGN independent of dust extinction. Using moderate colour criteria H-K>0.5 and K-LW2>2.7 we have selected a sample of 77 AGN candidates in an effective area of about 10 square degrees. By means of optical spectroscopy we find 24 (30%) type-1 QSOs at redshifts 0.10.8. About one third of the ISO-2MASS QSOs show so red optical colours, that they are missed in optical and UV AGN surveys like SDSS, 2DF, or HES. With a surface density of about 2 deg^(-2) down to RISO-2MASS QSOs outnumber the 1.35 deg^(-2) of the SDSS quasar survey by 50%; we find a combined optical-IR QSO surface density of 2.7 deg^(-2). Since only two of the ISO-2MASS QSOs have also J-K>2, the inclusion of the ISO mid-infrared photometry significantly extends the capabilities of the pure 2MASS red AGN survey. We suggest that the newly found red AGN resemble young members of the quasar population, and that quasars spend much of their lifetime in a dust enshrouded phase.

  19. Electricity Advisory Committee Notice of Open Meeting July 12, 2011:

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the YouTube|6721 Federal Register / Vol.6:Energy| Department ofFederal Register Notice

  20. Notice of Proposed Rulemaking (May 16, 2007) | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the.pdfBreaking ofOilNEW HAMPSHIREofNewsletterEnergy HeatingElectricMay 16, 2007) Notice

  1. SEP PROGRAM NOTICE 10-006A | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the.pdfBreakingMay 2015 <Department of ii iii2014SEA-04:SEET DecreasePROGRAM NOTICE

  2. CONSTRUCTION NOTICE SUPPLEMENT Additional Notice to Ongoing Project

    E-Print Network [OSTI]

    Dong, Yingfei

    CONSTRUCTION NOTICE SUPPLEMENT Additional Notice to Ongoing Project TO: Deans, Directors 23, 2011 HOURS OF CONSTRUCTION: Monday to Friday 7:30 a.m. to 4:00 p.m. ACCESSIBLE ROUTES: Accessible routes shall be maintained. ADVISORY: All persons in the vicinity of this construction project

  3. CONSTRUCTION NOTICE SUPPLEMENT Additional Notice to Ongoing Project

    E-Print Network [OSTI]

    CONSTRUCTION NOTICE SUPPLEMENT Additional Notice to Ongoing Project TO: Deans, Directors on the roof to June 30, 2011. DURATION OF PROJECT: May 21, 2011 to June 30, 2011 HOURS OF CONSTRUCTION: Monday persons in the vicinity of this construction project are advised to respect all construction barricades

  4. CONSTRUCTION NOTICE SUPPLEMENT Additional Notice to Ongoing Project

    E-Print Network [OSTI]

    CONSTRUCTION NOTICE SUPPLEMENT Additional Notice to Ongoing Project TO: Deans, Directors. DURATION OF PROJECT: May 31, 2011 to June 21, 2011 HOURS OF CONSTRUCTION: Monday to Friday 7:30 a.m. to 4. The loading area will be closed on May 31, 2011. ADVISORY: All persons in the vicinity of this construction

  5. Efficiency of the centrifugally induced curvature drift instability in AGN winds

    E-Print Network [OSTI]

    Z. Osmanov

    2008-05-09T23:59:59.000Z

    For studying how the field lines are twisting nearby the light cylinder surface, which provides the free motion of AGN winds through the mentioned area, the investigation of the centrifugally driven curvature drift instability is presented. Studying the dynamics of the relativistic MHD flow close to the light cylinder surface, by applying a single particle approach based on the centrifugal acceleration, the dispersion relation of the instability is derived and analytically solved. Considering the typical values of AGN winds, it is shown that the time scale of the curvature drift instability is much less than the accretion process time scale, indicating that the present instability is very efficient and might strongly influence processes in AGN plasmas.

  6. Why does Low-Luminosity AGN Fueling Remain an Unsolved Problem?

    E-Print Network [OSTI]

    Paul Martini

    2004-04-21T23:59:59.000Z

    Despite many years of effort, observational studies have not found a strong correlation between the presence of any proposed fueling mechanism and low-luminosity AGN. After a discussion of the mass requirements for fueling, I summarize this observational work and provide a number of hypotheses for why the nature of AGN fueling has remained unresolved. In particular, I stress the potential importance of the increasing number of candidate fueling mechanisms with decreasing mass accretion rate, the relevant spatial scales for different fueling mechanisms, and the lifetime of an individual episode of nuclear accretion. The episodic AGN lifetime is a particularly relevant complication if it is comparable to or shorter than the time that the responsible fueling mechanisms are observationally detectable. I conclude with a number of relatively accessible areas for future investigation.

  7. Notes and Definitions

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItemResearch > The EnergyCenterDioxideDocumentationThreeNewsfuelNotes and Definitions

  8. Star-Formation in Low Radio Luminosity AGN from the Sloan Digital Sky Survey

    SciTech Connect (OSTI)

    de Vries, W H; Hodge, J A; Becker, R H; White, R L; Helfand, D J

    2007-04-18T23:59:59.000Z

    We investigate faint radio emission from low- to high-luminosity Active Galactic Nuclei (AGN) selected from the Sloan Digital Sky Survey (SDSS). Their radio properties are inferred by coadding large ensembles of radio image cut-outs from the FIRST survey, as almost all of the sources are individually undetected. We correlate the median radio flux densities against a range of other sample properties, including median values for redshift, [O III] luminosity, emission line ratios, and the strength of the 4000{angstrom} break. We detect a strong trend for sources that are actively undergoing star-formation to have excess radio emission beyond the {approx} 10{sup 28} ergs s{sup -1} Hz{sup -1} level found for sources without any discernible star-formation. Furthermore, this additional radio emission correlates well with the strength of the 4000{angstrom} break in the optical spectrum, and may be used to assess the age of the star-forming component. We examine two subsamples, one containing the systems with emission line ratios most like star-forming systems, and one with the sources that have characteristic AGN ratios. This division also separates the mechanism responsible for the radio emission (star-formation vs. AGN). For both cases we find a strong, almost identical, correlation between [O III] and radio luminosity, with the AGN sample extending toward lower, and the star-formation sample toward higher luminosities. A clearer separation between the two subsamples is seen as function of the central velocity dispersion {sigma} of the host galaxy. For systems at similar redshifts and values of {sigma}, the star-formation subsample is brighter than the AGN in the radio by an order of magnitude. This underlines the notion that the radio emission in star-forming systems can dominate the emission associated with the AGN.

  9. Notes on basic algebraic geometry

    E-Print Network [OSTI]

    2008-06-16T23:59:59.000Z

    Jun 16, 2008 ... Notes on basic algebraic geometry ...... Having discovered the basic equation ..... back to a rational function on X. Thus we get a nonzero ...

  10. NOTE / NOTE Sex ratio variation in gynodioecious species of

    E-Print Network [OSTI]

    Dorken, Marcel

    NOTE / NOTE Sex ratio variation in gynodioecious species of Echium endemic to the Canary Islands Marcel E. Dorken Abstract: Species of Echium from the Canary Islands represent an adaptive radiation fertility of females and hermaphrodites were de- tected. Key words: Canary Islands, Echium, island radiation

  11. Notes2Providers.doc -1-Notes to Retail Providers

    E-Print Network [OSTI]

    providers that purchase electricity from a power pool that submits an Annual Report to the Energy CommissionNotes2Providers.doc -1- Notes to Retail Providers February 2003 Power Source Disclosure an energy mix or fuel mix different than the California Mix, (Net System Power)i . As a retail provider you

  12. Instructions for Request for Dissertation Defense Note: This is a fillable form that eliminates the need to print-out and write-in your

    E-Print Network [OSTI]

    Texas at Arlington, University of

    Instructions for Request for Dissertation Defense Note: This is a fillable form that eliminates SCHOOL THE UNIVERSITY OF TEXAS AT ARLINGTON REQUEST FOR DISSERTATION DEFENSE (Notice of Acceptance of the Doctoral Dissertation for the Purpose of Giving the Final Oral Examination on the Dissertation

  13. Quantifying AGN-Driven Metal-Enhanced Outflows in Chemodynamical Simulations

    E-Print Network [OSTI]

    Taylor, Philip

    2015-01-01T23:59:59.000Z

    We show the effects of AGN-driven outflows on the ejection of heavy elements using our cosmological simulations, where super-massive black holes originate from the first stars. In the most massive galaxy, we have identified two strong outflows unambiguously driven by AGN feedback. These outflows have a speed greater than $\\sim 8000$ km\\,s$^{-1}$ near the AGN, and travel out to a half Mpc with $\\sim 3000$ km\\,s$^{-1}$. These outflows remove the remaining gas ($\\sim 3$ per cent of baryons) and significant amounts of metals ($\\sim 2$ per cent of total produced metals) from the host galaxy, chemically enriching the circumgalactic medium (CGM) and the intergalactic medium (IGM). 17.6 per cent of metals from this galaxy, and 18.4 per cent of total produced metals in the simulation, end up in the CGM and IGM, respectively. The metallicities of the CGM and IGM are higher with AGN feedback, while the mass--metallicity relation of galaxies is not affected very much. We also find `selective' mass-loss where iron is more...

  14. Pinpointing the base of the AGN jets through general relativistic X-ray reverberation studies

    E-Print Network [OSTI]

    D. Emmanoulopoulos

    2014-11-03T23:59:59.000Z

    Many theoretical models of Active Galactic Nuclei (AGN) predict that the X-ray corona, lying above the black hole, constitutes the base of the X-ray jet. Thus, by studying the exact geometry of the close black hole environment, we can pinpoint the launching site of the jet. Detection of negative X-ray reverberation time delays (i.e. soft band X-ray variations lagging behind the corresponding hard band X-ray variations) can yield significant information about the geometrical properties of the AGN, such as the location of the X-ray source, as well as the physical properties of the the black hole, such as its mass and spin. In the frame-work of the lamp-post geometry, I present the first systematic X-ray time-lag modelling results of an ensemble of 12 AGN, using a fully general relativistic (GR) ray tracing approach for the estimation of the systems' response functions. By combing these state-of-the art GR response models with statistically innovative fitting routines, I derive the geometrical layout of the close BH environment for each source, unveiling the position of the AGN jet-base.

  15. Radiation pressure, absorption and AGN feedback in the Chandra Deep Fields

    E-Print Network [OSTI]

    Raimundo, S I; Bauer, F E; Alexander, D M; Brandt, W N; Luo, B; Vasudevan, R V; Xue, Y Q

    2010-01-01T23:59:59.000Z

    The presence of absorbing gas around the central engine of Active Galactic Nuclei (AGN) is a common feature of these objects. Recent work has looked at the effect of the dust component of the gas, and how it enhances radiation pressure such that dusty gas can have a lower effective Eddington limit than ionised gas. In this work, we use multi-wavelength data and X-ray spectra from the 2 Ms exposures of the Chandra Deep Field North and Chandra Deep Field South surveys, to characterise the AGN in terms of their Eddington ratio and hydrogen column density. Their distributions are then compared with what is predicted when considering the coupling between dust and gas. Our final sample consists of 234 objects from both fields, the largest and deepest sample of AGN for which this comparison has been made up to date. We find that most of the AGN in our sample tend to be found at low Eddington ratios (typically between 1e-4 and 1e-1) and high column density (>1e22 cm^-2), with black hole masses between ~1e8 and 1e9 so...

  16. The ULIRG NGC 6240: Luminous extended Xray emission and evidence for an AGN

    E-Print Network [OSTI]

    Greiner, Jochen

    spectrum can be well fit by emission from two components in roughly equal proportions: a thermal optically for the formation of this AGN. However, the lu­ minosity in the remaining extended thermal component is still et al. 1997). Within this core most of the ulti­ mate enigmatic power source of the FIR radiation

  17. X-ray Observations of AGN at Intermediate to High Redshift

    E-Print Network [OSTI]

    K. A. Weaver

    1999-04-22T23:59:59.000Z

    The cores of active galactic nuclei (AGN) harbor some of the most extreme conditions of matter and energy in the Universe. One of the major goals of high-energy astrophysics is to probe these extreme environments in the vicinity of supermassive black holes, which are intimately linked to the mechanisms that produce the continuum emission in AGN. X-ray studies seek to understand the physics responsible for the continuum emission, its point of origin, how nuclear activity is fueled, and how supermassive black holes evolve. The key to finding answers to these questions lies in measuring the intrinsic luminosities and spectral shapes, the relation of these properties to other wavebands, and how the source properties change with redshift. This article reviews X-ray observations of AGN from redshifts of ~0.1-3 with the goal of summarizing our current knowledge of their X-ray spectral characteristics. Results are evaluated in terms of their robustness and are examined in the light of current theoretical predictions of energy release via processes associated with the accretion mechanism. A possible evolutionary scenario is discussed, along with the importance of AGN studies at high redshift as they relate to the total energetics of the Universe.

  18. Baltic Astronomy, vol. 20, 490494, 2011 AGN DUSTY TORI AS A CLUMPY TWO-PHASE MEDIUM

    E-Print Network [OSTI]

    Baes, Maarten

    ´c1 1 Astronomical Observatory, Volgina 7, 11060 Belgrade, Serbia; mstalevski@aob.rs 2 Sterrenkundig a three- dimensional radiative transfer code to obtain spectral energy distributions and images of tori in the spectral energy distribution (SED) of AGNs and a silicate feature caused by Si-O stretching modes, giving

  19. Texas Phosphorus Index TECHNICAL NOTES

    E-Print Network [OSTI]

    Mukhtar, Saqib

    for West Texas, see Figure 1. NRCS and Extension Service specialists in Texas developed the P indicesTexas Phosphorus Index TECHNICAL NOTES U.S. DEPARTMENT OF AGRICULTURE NATURAL RESOURCES CONSERVATION SERVICE TEXAS Revised December, 2012 AGRONOMY TECHNICAL NOTE NUMBER ­ 15 PHOSPHORUS ASSESSMENT

  20. Notice Type: Presolicitation

    E-Print Network [OSTI]

    , 2014 3:11 pm The Naval Research Laboratory has a requirement for a contractor to Provide Screens to Chilled Water Plant Cooling Towers Bldg A-47. (Microsoft IE required). Additional specifications this solicitation. Note: Vendors will be ineligible for award unless they have registered in the System for Award

  1. HOUSING SERVICES NOTICE OF INTENTION TO CANCEL

    E-Print Network [OSTI]

    Seldin, Jonathan P.

    HOUSING SERVICES NOTICE OF INTENTION TO CANCEL SINGLE STUDENT HOUSING LICENSE AGREEMENT DATE RECEIVED:_______________________ TO: Housing Services FROM:_________________________________ ID NUMBER:___________________________ In accordance with the RESIDENCE CANCELLATION POLICY/LICENSE AGREEMENT, I hereby give Housing Services notice

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    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

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    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    May 11, 2015 EIS-0283-S2: EPA Notice of Availability of the Final Supplemental Environmental Impact Statement Surplus Plutonium Disposition May 1, 2015 EIS-0408: DOE Notice of...

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  6. HEAVILY OBSCURED AGN IN STAR-FORMING GALAXIES AT z approx = 2

    SciTech Connect (OSTI)

    Treister, E.; Kartaltepe, Jeyhan; Le Floc'h, Emeric [Institute for Astronomy, 2680 Woodlawn Drive, University of Hawaii, Honolulu, HI 96822 (United States); Cardamone, Carolin N.; Schawinski, Kevin; Urry, C. Megan; Virani, Shanil [Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520 (United States); Gawiser, Eric [Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019 (United States); Lira, Paulina [Departamento de AstronomIa, Universidad de Chile, Casilla 36-D, Santiago (Chile); Damen, Maaike; Taylor, Edward N. [Sterrewacht Leiden, Leiden University, NL-2300 RA Leiden (Netherlands); Justham, Stephen [Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing (China); Koekemoer, Anton M., E-mail: treister@ifa.hawaii.ed [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)

    2009-11-20T23:59:59.000Z

    We study the properties of a sample of 211 heavily obscured active galactic nucleus (AGN) candidates in the extended Chandra Deep Field-South selecting objects with f {sub 24m}u{sub m}/f{sub R} > 1000 and R - K>4.5. Of these, 18 were detected in X-rays and found to be obscured AGNs with neutral hydrogen column densities of approx10{sup 23} cm{sup -2}. In the X-ray-undetected sample, the following evidence suggests a large fraction of heavily obscured (Compton-thick) AGN: (1) The stacked X-ray signal of the sample is strong, with an observed ratio of soft to hard X-ray counts consistent with a population of approx90% heavily obscured AGNs combined with 10% star-forming galaxies. (2) The X-ray-to-mid-IR ratios for these sources are significantly larger than that of star-forming galaxies and approx2 orders of magnitude smaller than for the general AGN population, suggesting column densities of N {sub H} approx> 5 x 10{sup 24} cm{sup -2}. (3) The Spitzer near- and mid-IR colors of these sources are consistent with those of the X-ray-detected samples if the effects of dust self-absorption are considered. Spectral fitting to the rest-frame UV/optical light (dominated by the host galaxy) returns stellar masses of approx10{sup 11} M{sub sun} and (E(B - V)) = 0.5, and reveals evidence for a significant young stellar population, indicating that these sources are experiencing considerable star formation. This sample of heavily obscured AGN candidates implies a space density at z approx 2 of approx10{sup -5} Mpc{sup -3}, finding a strong evolution in the number of L{sub X} >10{sup 44} erg s{sup -1} sources from z = 1.5 to 2.5, possibly consistent with a short-lived heavily obscured phase before an unobscured quasar is visible.

  7. The Spatial Clustering of ROSAT All-Sky Survey AGNs II. Halo Occupation Distribution Modeling of the Cross Correlation Function

    E-Print Network [OSTI]

    Miyaji, Takamitsu; Coil, Alison L; Aceves, Hector

    2010-01-01T23:59:59.000Z

    This is the second paper of a series that reports on our investigation of the clustering properties of AGNs in the ROSAT All-Sky Survey (RASS) through cross-correlation functions (CCFs) with Sloan Digital Sky Survey (SDSS) galaxies. In this paper, we apply the Halo Occupation Distribution (HOD) model to the CCFs between the RASS Broad-line AGNs with SDSS Luminous Red Galaxies (LRGs) in the redshift range 0.16AGNs by a model fit to the CCF. For the first time, we are able to go beyond quoting merely a `typical' AGN host halo mass, M_h, and model the full distribution function of AGN host dark matter halos. In addition, we are able to determine the large-scale bias and the mean M_h more accurately. We explore the behavior of three simple HOD models. Our first model (Model A) is a truncated power-law HOD model in which all AGNs are satellites. With this model, we find an upper lim...

  8. Empirical links between XRB and AGN accretion using the complete z < 0.4 spectroscopic CSC/SDSS catalog

    SciTech Connect (OSTI)

    Trichas, Markos [EADS Astrium, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2AS (United Kingdom); Green, Paul J.; Aldcroft, Tom; Sobolewska, Malgosia; Kim, Dong-Woo [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States); Constantin, Anca [Department of Physics and Astronomy, James Madison University, PHCH, Harrisonburg, VA 22807 (United States); Kalfountzou, Eleni [Center for Astrophysics, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB (United Kingdom); Hyde, Ashley K. [Astrophysics Group, Imperial College London, London SW7 2AZ (United Kingdom); Zhou, Hongyan [Center for Astrophysics, University of Science and Technology of China, Hefei 230026 (China); Haggard, Daryl [Center for Interdisciplinary Exploration and Research in Astrophysics, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208 (United States); Kelly, Brandon C., E-mail: markos.trichas@astrium.eads.net [Department of Physics, Broida Hall, University of California, Santa Barbara, CA 93107 (United States)

    2013-12-01T23:59:59.000Z

    Striking similarities have been seen between accretion signatures of Galactic X-ray binary (XRB) systems and active galactic nuclei (AGNs). XRB spectral states show a V-shaped correlation between X-ray spectral hardness and Eddington ratio as they vary, and some AGN samples reveal a similar trend, implying analogous processes at vastly larger masses and timescales. To further investigate the analogies, we have matched 617 sources from the Chandra Source Catalog to Sloan Digital Sky Survey spectroscopy, and uniformly measured both X-ray and optical spectral characteristics across a broad range of AGN and galaxy types. We provide useful tabulations of X-ray spectral slope for broad- and narrow-line AGNs, star-forming and passive galaxies, and composite systems, also updating relationships between optical (H? and [O III]) line emission and X-ray luminosity. We further fit broadband spectral energy distributions with a variety of templates to estimate bolometric luminosity. Our results confirm a significant trend in AGNs between X-ray spectral hardness and Eddington ratio expressed in X-ray luminosity, albeit with significant dispersion. The trend is not significant when expressed in the full bolometric or template-estimated AGN luminosity. We also confirm a relationship between the X-ray/optical spectral slope ?{sub ox} and Eddington ratio, but it may not follow the trend predicted by analogy with XRB accretion states.

  9. Wavelet analysis of a large sample of AGN at high radio frequencies

    E-Print Network [OSTI]

    T. Hovatta; H. J. Lehto; M. Tornikoski

    2008-07-11T23:59:59.000Z

    We have studied the characteristic timescales of 80 AGNs at 22, 37 and 90 GHz examining the properties of the wavelet method and comparing them to traditional Fourier-based methods commonly used in astronomy. We used the continuous wavelet transform with the Morlet wavelet to study the characteristic timescales. We also gain information when the timescale is present in the flux curve and if it is persistent or not. Our results show that the sources are not periodic and changes in the timescales over a long time are common. The property of wavelets to be able to distinguish when the timescale has been present is superior to the Fourier-based methods. Therefore we consider it appropriate to use wavelets when the quasi-periodicities in AGNs are studied.

  10. Radio observations of the first three-month Fermi-AGN at 4.8 GHz

    E-Print Network [OSTI]

    Xiang Liu; Hua-Gang Song; Jun Liu; Zhen Ding; Nicola Marchili; Thomas P. Krichbaum; Lars Fuhrmann; Anton Zensus; Tao An

    2011-10-09T23:59:59.000Z

    Using the Urumqi 25m radio telescope, sources from the first three-month Fermi-LAT detected AGN catalog with declination >0 were observed in 2009 at 4.8 GHz. The radio flux density appears to correlate with the gamma-ray intensity. Intra-day variability (IDV) observations were performed in March, April and May in 2009 for selected 42 gamma-ray bright blazars, and 60% of them show evident flux variability at 4.8 GHz during the IDV observations, the IDV detection rate is higher than that in previous flat-spectrum AGN samples. The IDV appears more often in the VLBI-core dominant blazars, and the non-IDV blazars show relatively `steeper' spectral indices than the IDV blazars. Pronounced inter-month variability has been found in two BL Lac objects: J0112+2244 and J0238+1636.

  11. Doppler Boosting and Deboosting Effects in the Forward Relativistic Jets of AGNs and GRBs

    E-Print Network [OSTI]

    Jianfeng Zhou; Yan Su

    2006-10-15T23:59:59.000Z

    It is widely accepted that the Doppler deboosting effects exist in counter relativistic jets. However, people often neglect another important fact that both Doppler boosting and deboosting effects could happen in forward relativistic jets. Such effects might be used to explain some strange phenomena, such as the invisible gaps between the inner and outer jets of AGNs, and the rapid initial decays and re-brightening bumps in the light curves of GRBs.

  12. The distribution of silicate strength in Spitzer spectra of AGNs and ULIRGs

    E-Print Network [OSTI]

    Lei Hao; D. W. Weedman; H. W. W. Spoon; J. A. Marshall; N. A. Levenson; M. Elitzur; J. R. Houck

    2006-12-18T23:59:59.000Z

    A sample of 196 AGNs and ULIRGs observed by the Infrared Spectrograph (IRS) on Spitzer is analyzed to study the distribution of the strength of the 9.7 micron silicate feature. Average spectra are derived for quasars, Seyfert 1 and Seyfert 2 AGNs, and ULIRGs. We find that quasars are characterized by silicate features in emission and Seyfert 1s equally by emission or weak absorption. Seyfert 2s are dominated by weak silicate absorption, and ULIRGs are characterized by strong silicate absorption (mean apparent optical depth about 1.5). Luminosity distributions show that luminosities at rest frame 5.5 micron are similar for the most luminous quasars and ULIRGs and are almost 10^5 times more luminous than the least luminous AGN in the sample. The distributions of spectral characteristics and luminosities are compared to those of optically faint infrared sources at z~2 being discovered by the IRS, which are also characterized by strong silicate absorption. It is found that local ULIRGs are a similar population, although they have lower luminosities and somewhat stronger absorption compared to the high redshift sources.

  13. Unravelling lifecycles & physics of radio-loud AGN in the SKA era

    E-Print Network [OSTI]

    Kapi?ska, Anna D; Jackson, Carole A; An, Tao; Baan, Willem A; Jarvis, Matt J

    2014-01-01T23:59:59.000Z

    Radio-loud AGN (>10^{22} W/Hz at 1.4 GHz) will be the dominant bright source population detected with the SKA. The high resolution that the SKA will provide even in wide-area surveys will mean that, for the first time sensitive, multi-frequency total intensity and polarisation imaging of large samples of radio-loud active galactic nuclei (AGN) will become available. The unprecedented sensitivity of the SKA coupled with its wide field of view capabilities will allow identification of objects of the same morphological type (i.e. the entire FR I, low- and high-luminosity FR II, disturbed morphology as well as weak radio-emitting AGN populations) up to high redshifts (z~4 and beyond), and at the same stage of their lives, from the youngest CSS/GPS sources to giant and fading (dying) sources, through to those with restarted activity radio galaxies and quasars. Critically, the wide frequency coverage of the SKA will permit analysis of same-epoch rest-frame radio properties, and the sensitivity and resolution will a...

  14. The distribution of absorption in AGN detected in the XMM-Newton observations of the CDFS

    E-Print Network [OSTI]

    T. Dwelly; M. J. Page

    2006-08-23T23:59:59.000Z

    We have used very deep XMM-Newton observations of the Chandra Deep Field-South to examine the spectral properties of the faint active galactic nucleus (AGN) population. Crucially, redshift measurements are available for 84% (259/309) of the XMM-Newton sample. We have calculated the absorption and intrinsic luminosities of the sample using an extensive Monte Carlo technique incorporating the specifics of the XMM-Newton observations. Twenty-three sources are found to have substantial absorption and intrinsic X-ray luminosities greater than 10^44 erg/s, putting them in the "type-2" QSO regime. We compare the redshift, luminosity and absorption distributions of our sample to the predictions of a range of AGN population models. In contrast to recent findings from ultra-deep Chandra surveys, we find that there is little evidence that the absorption distribution is dependent on either redshift or intrinsic X-ray luminosity. The pattern of absorption in our sample is best reproduced by models in which ~75% of the AGN population is heavily absorbed at all luminosities and redshifts.

  15. Latest Documents and Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the.pdfBreaking ofOil & Gas »of Energy Laser-Firing ChemCam Vital

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    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the.pdfBreaking ofOilNEW HAMPSHIRE BUILDS OFF BEACON COMMUNITIES NEWNOAA Webinar:Upcoming|

  17. Electricity Advisory Committee Notice of Open Meeting March 12...

    Energy Savers [EERE]

    12 and 13, 2014: Federal Register Notice Volume 79, No. 37 - February 25, 2014 Electricity Advisory Committee Notice of Open Meeting March 12 and 13, 2014: Federal Register Notice...

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    5 and 6, 2013: Federal Register Notice Volume 78, No. 93 - May 14, 2013 Electricity Advisory Committee Notice of Open Meeting June 5 and 6, 2013: Federal Register Notice Volume 78,...

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    5 and 6, 2012: Federal Register Notice Volume 77, No. 35 - Feb. 22, 2012 Electricity Advisory Committee Notice of Open Meeting March 5 and 6, 2012: Federal Register Notice Volume...

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  3. INSTRUCTIONS FOR OVERNIGHT EXPERIMENT NOTICE When to complete this notice?

    E-Print Network [OSTI]

    Shull, Kenneth R.

    requiring this notice include those involving highly reactive chemicals; highly exothermic reactions for unexpected interruptions in utility services (e.g., electricity, cooling water, inert gas) and train all lab of leaks or spills. Place protective shielding around reactive processes. · Keep c

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    FERC Notice of Availability of Draft Environmental Impact Statement EIS-0489: FERC Notice of Availability of Draft Environmental Impact Statement Jordan Cove Liquefaction Project...

  10. EIS-0489: EPA Notice of Availability of Draft Environmental Impact...

    Energy Savers [EERE]

    89: EPA Notice of Availability of Draft Environmental Impact Statement EIS-0489: EPA Notice of Availability of Draft Environmental Impact Statement Jordan Cove Liquefaction Project...

  11. EIS-0404: EPA Notice of Availability of the Final Environmental...

    Broader source: Energy.gov (indexed) [DOE]

    FEIS-2010.pdf More Documents & Publications EIS-0455: EPA Notice of Availability of the Draft Environmental Impact Statement EIS-0407: EPA Notice of Availability of the Final...

  12. EIS-0284: EPA Notice of Availability of the Draft Environmental...

    Energy Savers [EERE]

    EPA Notice of Availability of the Draft Environmental Impact Statement EIS-0284: EPA Notice of Availability of the Draft Environmental Impact Statement Low Emission Boiler System...

  13. EIS-0396: DOE Notice of Availability of the Draft Programmatic...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    DOE Notice of Availability of the Draft Programmatic Environmental Impact Statement EIS-0396: DOE Notice of Availability of the Draft Programmatic Environmental Impact Statement...

  14. EIS-0495: EPA Notice of Availability of Draft Environmental Impact...

    Office of Environmental Management (EM)

    EPA Notice of Availability of Draft Environmental Impact Statement EIS-0495: EPA Notice of Availability of Draft Environmental Impact Statement EIS-0495: Walla Walla Basin Spring...

  15. EIS-0481: DOE Notice of Availability of Draft Programmatic Environment...

    Energy Savers [EERE]

    DOE Notice of Availability of Draft Programmatic Environmental Impact Statement EIS-0481: DOE Notice of Availability of Draft Programmatic Environmental Impact Statement Engineered...

  16. EIS-0419: EPA Notice of Availability of the Draft Environmental...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    EPA Notice of Availability of the Draft Environmental Impact Statement EIS-0419: EPA Notice of Availability of the Draft Environmental Impact Statement Whistling Ridge Energy...

  17. EIS-0370: EPA Notice of Availability of the Final Environmental...

    Broader source: Energy.gov (indexed) [DOE]

    EPANOA-2011.pdf More Documents & Publications EIS-0440: DOE and EPA Notice of Availability of a Draft Environmental Impact Statement EIS-0440: EPA Notice of Availability of the...

  18. EIS-0357: EPA Notice of Availability of the Final Environmental...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    EPA Notice of Availability of the Final Environmental Impact Statement EIS-0357: EPA Notice of Availability of the Final Environmental Impact Statement Gilberton Coal-to-Clean...

  19. EIS-0491: EPA Notice of Availability of Draft Environmental Impact...

    Energy Savers [EERE]

    1: EPA Notice of Availability of Draft Environmental Impact Statement EIS-0491: EPA Notice of Availability of Draft Environmental Impact Statement Lake Charles Liquefaction...

  20. EIS-0426: EPA Notice of Availability of the Final Environmental...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    EPA Notice of Availability of the Final Environmental Impact Statement EIS-0426: EPA Notice of Availability of the Final Environmental Impact Statement The Environmental Protection...

  1. EA-1566: DOE Notice of Availability of the Draft Environmental...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    DOE Notice of Availability of the Draft Environmental Assessment EA-1566: DOE Notice of Availability of the Draft Environmental Assessment Proposed Infrastructure Improvements for...

  2. EIS-0421: EPA Notice of Availability of the Final Environmental...

    Broader source: Energy.gov (indexed) [DOE]

    More Documents & Publications EIS-0421EPANOA2011.pdf EIS-0424: EPA Notice of Availability of the Draft Environmental Impact Statement EIS-0486: EPA Notice of Availability of...

  3. EIS-0361: EPA Notice of Availability of the Final Environmental...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Final Environmental Impact Statement EIS-0361: EPA Notice of Availability of the Final Environmental Impact Statement Western Greenbrier Co-Production Demonstration Project Notices...

  4. EIS-0472: DOE Notice of Availability of a Draft Programmatic...

    Energy Savers [EERE]

    DOE Notice of Availability of a Draft Programmatic Environmental Impact Statement EIS-0472: DOE Notice of Availability of a Draft Programmatic Environmental Impact Statement...

  5. EIS-0444: EPA Notice of Availability of the Final Environmental...

    Broader source: Energy.gov (indexed) [DOE]

    Ector, Texas 2011-19917.pdf More Documents & Publications EIS-0375: EPA Notice of Availability of the Draft Environmental Impact Statement EIS-0487: Notices of Availability of...

  6. EIS-0441: Amended Notice of Availability of a Draft Environmental...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Amended Notice of Availability of a Draft Environmental Impact Statement EIS-0441: Amended Notice of Availability of a Draft Environmental Impact Statement Mohave County Wind Farm...

  7. EIS-0451: EPA Notice of Availability of a Draft Environmental...

    Office of Environmental Management (EM)

    1: EPA Notice of Availability of a Draft Environmental Impact Statement EIS-0451: EPA Notice of Availability of a Draft Environmental Impact Statement Hooper Springs Transmission...

  8. EIS-0444: DOE Notice of Availability of the Draft Environmental...

    Broader source: Energy.gov (indexed) [DOE]

    Notice of Availability of the Draft Environmental Impact Statement and Public Hearing Notice for the Texas Clean Energy Project, near Odessa, Ector County, Texas, DOEEIS-0444...

  9. EIS-0375: DOE Notice of Availability of the Draft Environmental...

    Office of Environmental Management (EM)

    5: DOE Notice of Availability of the Draft Environmental Impact Statement EIS-0375: DOE Notice of Availability of the Draft Environmental Impact Statement Disposal of...

  10. Notice of Availability, Federal Register, 64 FR 3492, January...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    64 FR 3492, January 22, 1999 Notice of Availability, Federal Register, 64 FR 3492, January 22, 1999 Document displays a notice of availability pertaining to the Availability of...

  11. EIS-0404: EPA Notice of Availability of the Draft Environmental...

    Broader source: Energy.gov (indexed) [DOE]

    DEIS-2009.pdf More Documents & Publications EIS-0361: EPA Notice of Availability of the Draft Environmental Impact Statement EIS-0382: EPA Notice of Availability of the Final...

  12. EIS-0336: EPA Notice of Availability of the Final Environmental...

    Office of Environmental Management (EM)

    EPA Notice of Availability of the Final Environmental Impact Statement EIS-0336: EPA Notice of Availability of the Final Environmental Impact Statement Tucson Electric Power...

  13. Energy Conservation Program: Test Procedure for Pumps, Notice...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Conservation Program: Test Procedure for Pumps, Notice of Proposed Rulemaking Energy Conservation Program: Test Procedure for Pumps, Notice of Proposed Rulemaking This document is...

  14. EIS-0396: Advance Notice of Intent o Prepare an Environmental...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    EIS-0396: Advance Notice of Intent o Prepare an Environmental Impact Statement Global Nuclear Energy Partnership Technology Demonstration Program Advance Notice of Intent To...

  15. EA-1947: Notice of Intent to Prepare an Environmental Assessment...

    Energy Savers [EERE]

    Notice of Intent to Prepare an Environmental Assessment and Cancellation of an Environmental Impact Statement EA-1947: Notice of Intent to Prepare an Environmental Assessment and...

  16. EIS-0467: Notice of Intent to Prepare an Environmental Impact...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    and Notice of Floodplains and Wetlands Involvement Acquisition of a Natural Gas Pipeline and Natural Gas Utility Service at the Hanford Site, Richland, WA, and Notice of...

  17. Enforcement Notice of Intent to Investigate, Los Alamos National...

    Office of Environmental Management (EM)

    Los Alamos National Security, LLC Enforcement Notice of Intent to Investigate, National Security Technologies, LLC Enforcement Notice of Intent to Investigate, UT-Battelle...

  18. Preliminary Notice of Violation, Babcock & Wilcox Technical Services...

    Office of Environmental Management (EM)

    Babcock & Wilcox Technical Services Y-12, LLC - July 10, 2009 Notice of Violation, Battelle Energy Alliance, LLC - WEA-2008-01 Preliminary Notice of Violation, Battelle Energy...

  19. EIS-0481: EPA Notice of Availability of Draft Programmatic Environment...

    Energy Savers [EERE]

    481: EPA Notice of Availability of Draft Programmatic Environmental Impact Statement EIS-0481: EPA Notice of Availability of Draft Programmatic Environmental Impact Statement...

  20. EIS-0486: EPA Notice of Availability of Draft Environmental Impact...

    Energy Savers [EERE]

    486: EPA Notice of Availability of Draft Environmental Impact Statement EIS-0486: EPA Notice of Availability of Draft Environmental Impact Statement Plains & Eastern Clean Line...

  1. EIS-0496: Notice of Intent to Prepare an Environmental Impact...

    Energy Savers [EERE]

    6: Notice of Intent to Prepare an Environmental Impact Statement EIS-0496: Notice of Intent to Prepare an Environmental Impact Statement DOE's Western Area Power Administration...

  2. EIS-0481: Notice of Intent to Prepare a Programmatic Environmental...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Notice of Intent to Prepare a Programmatic Environmental Impact Statement EIS-0481: Notice of Intent to Prepare a Programmatic Environmental Impact Statement Engineered High Energy...

  3. EIS-0500: Notice of Intent to Prepare Environmental Impact Statement...

    Energy Savers [EERE]

    Notice of Intent to Prepare Environmental Impact Statement EIS-0500: Notice of Intent to Prepare Environmental Impact Statement Crystal Springs Hatchery Program; Bingham, Custer,...

  4. EIS-0481: Notice of Intent to Prepare a Programmatic Environmental...

    Energy Savers [EERE]

    81: Notice of Intent to Prepare a Programmatic Environmental Impact Statement EIS-0481: Notice of Intent to Prepare a Programmatic Environmental Impact Statement Engineered High...

  5. Federal Register Notice for Life Cycle Greenhouse Gas Perspective...

    Energy Savers [EERE]

    Federal Register Notice for Life Cycle Greenhouse Gas Perspective on Exporting Liquefied Natural Gas from the United States Federal Register Notice for Life Cycle Greenhouse Gas...

  6. Notice of Availability of Preliminary Plan for Retrospective...

    Energy Savers [EERE]

    Analysis of Existing Rules Notice of Availability of Preliminary Plan for Retrospective Analysis of Existing Rules Through this notice, the Department of Energy (DOE) announces...

  7. Enforcement Notice of Intent to Investigate, Brookhaven Science...

    Energy Savers [EERE]

    LLC More Documents & Publications Enforcement Notice of Intent to Investigate, Armor Tower, Inc. Enforcement Notice of Intent to Investigate, Construction Consultants L.I., Inc....

  8. EIS-0359: Notice of Change in National Environmental Policy ...

    Energy Savers [EERE]

    EIS-0359: Notice of Change in National Environmental Policy (NEPA) Compliance Approach Depleted Uranium Hexafluoride (DUF6) Conversion Facilities Project Notice of Change in...

  9. EIS-0394: Advance Notice of Intent to Prepare an Environmental...

    Energy Savers [EERE]

    Advance Notice of Intent to Prepare an Environmental Impact Statement EIS-0394: Advance Notice of Intent to Prepare an Environmental Impact Statement Implementation of the...

  10. The AGN content in luminous IR galaxies at z\\sim2 from a global SED analysis including Herschel data

    E-Print Network [OSTI]

    Pozzi, F; Gruppioni, C; Feltre, A; Fritz, J; Fadda, D; Andreani, P; Berta, S; Cimatti, A; Delvecchio, I; Lutz, D; Magnelli, B; Maiolino, R; Nordon, R; Popesso, P; Rodighiero, G; Rosario, D; Santini, P; Vaccari, M

    2012-01-01T23:59:59.000Z

    We use Herschel-PACS far-infrared data, combined with previous multi-band information and mid-IR spectra, to properly account for the presence of an active nucleus and constrain its energetic contribution in luminous infrared (IR) sources at z\\sim2. The sample is composed of 24 sources in the GOODS-South field, with typical IR luminosity of 10^{12} Lo. Data from the 4 Ms Chandra X-ray imaging in this field are also used to identify and characterize AGN emission. We reproduce the observed spectral energy distribution (SED), decomposed into a host-galaxy and an AGN component. A smooth-torus model for circum-nuclear dust is used to account for the direct and re-processed contribution from the AGN. We confirm that galaxies with typical L_{8-1000um}\\sim10^{12}Lo at z\\sim2 are powered predominantly by star-formation. An AGN component is present in nine objects (\\sim35% of the sample) at the 3sigma confidence level, but its contribution to the 8-1000 um emission accounts for only \\sim5% of the energy budget. The AGN...

  11. Technical Note 499 December1990

    E-Print Network [OSTI]

    Technical Note 499 · December1990 Interpretation as Abduction Jerry R. Hobbs, Mark Stickel;Interpretation as Abduction Jerry R. Hobbs, Mark Stickel, Douglas Appelt, and Paul Martin Artificial Intelligence Center SRI International Abstract Abduction is inference to the best explanation. In the TACITUS project

  12. A note on axial symmetries

    E-Print Network [OSTI]

    Christopher Beetle; Shawn Wilder

    2013-12-31T23:59:59.000Z

    This note describes a local scheme to characterize and normalize an axial Killing field on a general Riemannian geometry. No global assumptions are necessary, such as that the orbits of the Killing field all have period $2 \\pi$. Rather, any Killing field that vanishes at at least one point necessarily has the expected global properties.

  13. magnitude larger than in star-forming galaxies. This all suggests a heating source other than stars and the AGN is the obvious

    E-Print Network [OSTI]

    Blake, Geoffrey

    magnitude larger than in star-forming galaxies. This all suggests a heating source other than stars and the AGN is the obvious alternative. Differential magni®cation of AGN-heated gas therefore seems-switching schemeÐare the cause of the extended CO emission, but we consider it to be remote. This is borne out

  14. Preliminary Notice of Violation, National Security Technologies...

    Office of Environmental Management (EM)

    National Security Technologies, LLC - September 26, 2014 Preliminary Notice of Violation, National Security Technologies, LLC - September 26, 2014 September 26, 2014 Security...

  15. Preliminary Notice of Violation, Brookhaven Science Associates...

    Office of Environmental Management (EM)

    Brookhaven Science Associates, LLC - WEA-2013-01 Preliminary Notice of Violation, Brookhaven Science Associates, LLC - WEA-2013-01 August 29, 2013 Issued to Brookhaven Science...

  16. Preliminary Notice of Violation, Westinghouse Savannah River...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Notice of Violation, Westinghouse Savannah River Company - EA-2000-08 Type B Accident Investigation Board Report on the September 1, 1999, Plutonium Intakes at the...

  17. Preliminary Notice of Violation, Washington Closure Hanford,...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Notice of Violation, Savannah River Nuclear Solutions, LLC - WEA-2012-04 Type B Accident Investigation At Washington Closure Hanford, LLC, Employee Fall Injury on July 1,...

  18. Preliminary Notice of Violation, Lawrence Livermore National...

    Energy Savers [EERE]

    Preliminary Notice of Violation, University of California - EA-2006-01 Type B Accident Investigation Board Report on the June 2002 High Radiation Dose to Extremities in...

  19. Preliminary Notice of Violation, Pacific Underground Construction...

    Broader source: Energy.gov (indexed) [DOE]

    Pacific Underground Construction, Inc. - WEA-2009-02 Preliminary Notice of Violation, Pacific Underground Construction, Inc. - WEA-2009-02 April 7, 2009 Issued to Pacific...

  20. Radio Observations of the AGN and Gas in Low Surface Brightness Galaxies

    E-Print Network [OSTI]

    F. Combes; J. Palous; M. Das; N. Kantharia; S. N. Vogel; S. S. Mcgaugh

    2006-01-01T23:59:59.000Z

    Abstract. LSB galaxies have low metallicities, diffuse stellar disks, and massive HI disks. We have detected molecular gas in two giant LSB galaxies, UGC 6614 and F568-6. A millimeter continuum source has been detected in UGC 6614 as well. At centimeter wavelengths we have detected and mapped the continuum emission from the giant LSB galaxy 1300+0144. The emission is extended about the nucleus and is most likely originating from the AGN in the galaxy. The HI gas distribution and velocity field in 1300+0144 was also mapped. The HI disk extends well beyond the optical disk and appears lopsided in the intensity maps.

  1. The Role of MHD in the ICM and its Interactions with AGN Outflows

    E-Print Network [OSTI]

    T. W. Jones

    2007-08-17T23:59:59.000Z

    Magnetic fields probably play a central role in the dynamics and thermodynamics of ICMs and their interactions with AGNs, despite the fact that the fields usually contribute relatively little pressure; i.e., the ICM is a ``high-$\\beta$'' plasma. More typically, the roles of magnetic fields come through ``microscopic'' influences on charged particle behaviors, and through magnetic tension, which can still be significant in subsonic, high-$\\beta$ flows. I briefly review these issues, while exploring the underlying question of using the commonly-applied magnetohydrodynamics model in the ICM when Coulomb scattering mean free paths can sometimes exceed tens of kiloparsecs.

  2. Spectral comparison between AGN at z = 0.1, 0.2 and 0.3

    E-Print Network [OSTI]

    Winkler, Hartmut

    2015-01-01T23:59:59.000Z

    We identified three samples of ROSAT sources with Sloan Digital Sky Survey spectra, one at redshift z = 0.1, a second one at z = 0.2 and a third one at z = 0.3. 812 sources in total were examined. We determined the nature and spectral sub-types of the sources by visual inspection. The fraction of each sub-type at each of the three redshifts are then calculated. We consider selection biases caused by the luminosity cut-off threshold to determine whether any systematic trends in AGN type are evident with increasing redshift. We hence probe if an evolution effect is detected in our sample.

  3. NOTE: OPTIMAL NON-HOMOGENEOUS COMPOSITES FOR ...

    E-Print Network [OSTI]

    R. Tavakoli

    2012-10-02T23:59:59.000Z

    NOTE: OPTIMAL NON-HOMOGENEOUS COMPOSITES FOR. DYNAMIC LOADING REVISITED. R. TAVAKOLI. 1. Problem formulation. Consider ? ? Rd (

  4. THOMSON SCIENTIFIC EndNote Web

    E-Print Network [OSTI]

    texto. · Armazenar até 10.000 referências em sua base de dados pessoal (EndNote Web Library), pro resultados das pesquisas diretamente em sua base de dados pessoal do EndNote Web clicando no botão "Save to EndNote Web". As referências sal- vas em sua base de dados pessoal do EndNote Web serão exibidas com

  5. EIS-0236-S4: DOE Notice of Availability of the Draft Supplemental...

    Office of Environmental Management (EM)

    DOE Notice of Availability of the Draft Supplemental Programmatic Environmental Impact Statement and Notice of Public Hearings EIS-0236-S4: DOE Notice of Availability of the Draft...

  6. OFFSHORE WIND FARMS Guidance note for Environmental

    E-Print Network [OSTI]

    OFFSHORE WIND FARMS Guidance note for Environmental Impact Assessment In respect of FEPA and CPA requirements Version 2 - June 2004 #12;Offshore Wind Farms: Guidance Note for Environmental Impact Assessment 2004 #12;Offshore Wind Farms: Guidance Note for Environmental Impact Assessment in Respect of FEPA

  7. DANE TECHNICAL NOTE INFN -LNF, Accelerator Division

    E-Print Network [OSTI]

    Istituto Nazionale di Fisica Nucleare (INFN)

    K K DANE TECHNICAL NOTE INFN - LNF, Accelerator Division Frascati, March 10, 1997 Note: BM-1 BUNCH current. This measurement allows to calculate energy losses due to parasitic beam-vacuum chamber losses. In this Note we present results of the measurements and their analysis, comparing the results

  8. Electricity Advisory Committee Notice of Open Meeting March 6 and 7, 2013:

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the YouTube|6721 Federal Register / Vol.6:Energy| DepartmentFederal Register Notice

  9. Electricity Advisory Committee Notice of Open Meeting October 19 and 20,

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the YouTube|6721 Federal Register / Vol.6:Energy| DepartmentFederal Register Notice2011:

  10. Combining semi-analytic models with simulations of galaxy clusters: the need for AGN heating

    E-Print Network [OSTI]

    Short, C J

    2008-01-01T23:59:59.000Z

    [Abridged] We investigate the effect of energy feedback from galaxies on the intracluster medium (ICM) using a novel approach that couples a non-radiative cosmological hydrodynamical N-body simulation to a semi-analytic model (SAM) of galaxy formation. The SAM we employ is the Munich L-Galaxies model presented by De Lucia & Blaizot (2007). For each model galaxy, we calculate the energy returned to the ICM by Type II supernovae (SNe) and active galactic nuclei (AGN) and inject it into the gas component of the simulation at the appropriate location and time. To assess the impact of this feedback on the ICM, we focus on two key observables of galaxy groups and clusters: the X-ray luminosity-temperature (L-T) relation and the halo gas fraction. Using a suite of test simulations, we demonstrate that the level of stellar and AGN feedback predicted by L-Galaxies is insufficient to explain the observational data. This is because the energy liberated by quiescent 'radio' mode accretion onto the central black hole ...

  11. Cool core cycles: Cold gas and AGN jet feedback in cluster cores

    E-Print Network [OSTI]

    Prasad, Deovrat; Babul, Arif

    2015-01-01T23:59:59.000Z

    Using high-resolution 3-D and 2-D (axisymmetric) hydrodynamic simulations in spherical geometry, we study the evolution of cool cluster cores heated by feedback-driven bipolar active galactic nuclei (AGN) jets. Condensation of cold gas, and the consequent enhanced accretion, is required for AGN feedback to balance radiative cooling with reasonable efficiencies, and to match the observed cool core properties. A feedback efficiency (mechanical luminosity $\\approx \\epsilon \\dot{M}_{\\rm acc} c^2$; where $\\dot{M}_{\\rm acc}$ is the mass accretion rate at 1 kpc) as small as $5 \\times 10^{-5}$ is sufficient to reduce the cooling/accretion rate by $\\sim 10$ compared to a pure cooling flow. This value is smaller compared to the ones considered earlier, and is consistent with the jet efficiency and the fact that only a small fraction of gas at 1 kpc is accreted on to the supermassive black hole (SMBH). We find hysteresis cycles in all our simulations with cold mode feedback: {\\em condensation} of cold gas when the ratio...

  12. Unveiling the nature of the gamma-ray emitting AGN PKS 0521-36

    E-Print Network [OSTI]

    D'Ammando, F; Tavecchio, F; Ghisellini, G; Torresi, E; Giroletti, M; Raiteri, C M; Grandi, P; Aller, M; Aller, H; Gurwell, M A; Malaguti, G; Pian, E; Tosti, G

    2015-01-01T23:59:59.000Z

    PKS 0521-36 is an Active Galactic Nucleus (AGN) with uncertain classification. We investigate the properties of this source from radio to gamma rays. The broad emission lines in the optical and UV bands and steep radio spectrum indicate a possible classification as an intermediate object between broad-line radio galaxies (BLRG) and steep spectrum radio quasars (SSRQ). On pc-scales PKS 0521-36 shows a knotty structure similar to misaligned AGN. The core dominance and the gamma-ray properties are similar to those estimated for other SSRQ and BLRG detected in gamma rays, suggesting an intermediate viewing angle with respect to the observer. In this context the flaring activity detected from this source by Fermi-LAT between 2010 June and 2012 February is very intriguing. We discuss the gamma-ray emission of this source in the framework of the structured jet scenario, comparing the spectral energy distribution (SED) of the flaring state in 2010 June with that of a low state. We present three alternative models cor...

  13. The Nature of Blue Cores in Spheroids: a Possible Connection with AGN and Star Formation

    E-Print Network [OSTI]

    Felipe Menanteau; Andre R. Martel; Paolo Tozzi; Brenda Frye; Holland C. Ford; Leopoldo Infante; Narciso Benitez; Gaspar Galaz; Daniel Coe; Garth D. Illingworth; George F. Hartig; Marc Clampin

    2004-11-04T23:59:59.000Z

    We investigate the physical nature of blue cores in early-type galaxies through the first multi-wavelength analysis of a serendipitously discovered field blue-nucleated spheroid in the background of the deep ACS/WFC griz multicolor observations of the cluster Abell 1689. The resolved g-r, r-i and i-z color maps reveal a prominent blue core identifying this galaxy as a ``typical'' case study, exhibiting variations of 0.5-1.0 mag in color between the center and the outer regions, opposite to the expectations of reddened metallicity induced gradients in passively evolved ellipticals. From a Magellan-Clay spectrum we secure the galaxy redshift at $z=0.624$. We find a strong X-ray source coincident with the spheroid galaxy. Spectral features and a high X-ray luminosity indicate the presence of an AGN in the galaxy. However, a comparison of the X-ray luminosity to a sample derived from the Chandra Deep Field South displays Lx to be comparable to Type I/QSO galaxies while the optical flux is consistent with a normal star-forming galaxy. We conclude that the galaxy's non-thermal component dominates at high-energy wavelengths while we associate the spheroid blue light with the stellar spectrum of normal star-forming galaxies. We argue about a probable association between the presence of blue cores in spheroids and AGN activity.

  14. AGN feedback: galactic-scale outflows driven by radiation pressure on dust

    E-Print Network [OSTI]

    Ishibashi, W

    2015-01-01T23:59:59.000Z

    Galaxy-scale outflows, which are thought to provide the link connecting the central black hole to its host galaxy, are now starting to be observed. However, the physical origin of the mechanism driving the observed outflows, whether due to energy-driving or radiation-driving, is still debated; and in some cases, it is not clear whether the central source is an active galactic nucleus (AGN) or a nuclear starburst. Here we study the role of radiation pressure on dust in driving galactic-scale AGN outflows, and analyse the dynamics of the outflowing shell as a function of the underlying physical parameters. We show that high-velocity outflows ($\\gtrsim$1000 km/s) with large momentum flux ($\\gtrsim 10 L/c$) can be obtained, by taking into account the effects of radiation trapping. In particular, the high observed values of the momentum boosts can be reproduced, provided that the shell is initially optically thick to the reprocessed infrared radiation. Alternatively, the inferred measurements of the momentum flux ...

  15. A Hybrid Two Component Accretion Flow Surrounding Supermassive Black Holes in AGN

    E-Print Network [OSTI]

    Liu, B F; Qiao, E; Yuan, W

    2015-01-01T23:59:59.000Z

    It is commonly believed that the optical/UV and X-ray emissions in luminous AGN are produced in an accretion disk and an embedded hot corona respectively. The inverse Compton scattering of disk photons by hot electrons in the corona can effectively cool the coronal gas if the mass supply is predominantly via a cool disk like flow as in BHXRBs. Thus, the application of such a model to AGNs fails to produce their observed X-ray emission. As a consequence, a fraction of disk accretion energy is usually assumed to be transferred to the corona. To avoid this assumption, we propose that gas in a vertically extended distribution is supplied to a supermassive black hole by the gravitational capture of interstellar medium or stellar wind material. In this picture, the gas partially condenses to an underlying cool disk as it flows toward the black hole, releasing accretion energy as X-ray emission and supplying mass for the disk accretion. Detailed numerical calculations reveal that the X-ray luminosity can reach a few...

  16. Distant FR I radio galaxies in the Hubble Deep Field: implications for the cosmological evolution of radio-loud AGN

    E-Print Network [OSTI]

    Best, Philip

    Distant FR I radio galaxies in the Hubble Deep Field: implications for the cosmological evolution of radio-loud AGN I. A. G. SnellenP and P. N. Best Institute for Astronomy, Royal Observatory, Blackford S T R AC T Deep and high-resolution radio observations of the Hubble Deep Field and flanking fields have

  17. The exploration of massive multi-wavelength astronomical datasets: the case of AGNS in the Chandra Source Catalog

    E-Print Network [OSTI]

    D?Abrusco, Raffaele

    library. Different datasets obtained starting from samples of AGNs selected with different methods classification is available.This approach yields two advantages over the traditional study of low- dimensional.g., classification indices). A technique already applied to the problem of extraction of optical candidate quasars

  18. Do radio-loud AGN really follow the same relation between black hole mass and stellar velocity dispersion as normal galaxies?

    E-Print Network [OSTI]

    Liu Yi; D. R. Jiang

    2006-12-11T23:59:59.000Z

    In an examination of the relationship between the black hole mass and stellar velocity dispersion in radio-loud active galactic nuclei (AGNs), we studied two effects which may cause uncertainties in the black hole mass estimates of radio-loud AGNs: the relativistic beaming effect on the observed optical continuum radiation and the orientation effect on the broad emission line width. After correcting these two effects, we re-examined the relation between black hole mass and stellar velocity dispersion which derived from [OIII] line width for a sample of radio-loud and radio-quiet AGNs, and found the relation for radio-loud AGNs still deviated from that for nearby normal galaxies and radio-quiet AGNs. We also found there is no significant correlation between radio jet power and narrow [OIII] line width, indicating absence of strong interaction between radio jet and narrow line region. It may be that the deviation of the relation between black hole mass and stellar velocity dispersion of radio-loud AGNs is intrinsic, or that the [OIII] line width is not a good indicator of stellar velocity dispersion for radio-loud AGNs.

  19. Lecture notes for criticality safety

    SciTech Connect (OSTI)

    Fullwood, R.

    1992-03-01T23:59:59.000Z

    These lecture notes for criticality safety are prepared for the training of Department of Energy supervisory, project management, and administrative staff. Technical training and basic mathematics are assumed. The notes are designed for a two-day course, taught by two lecturers. Video tapes may be used at the options of the instructors. The notes provide all the materials that are necessary but outside reading will assist in the fullest understanding. The course begins with a nuclear physics overview. The reader is led from the macroscopic world into the microscopic world of atoms and the elementary particles that constitute atoms. The particles, their masses and sizes and properties associated with radioactive decay and fission are introduced along with Einstein's mass-energy equivalence. Radioactive decay, nuclear reactions, radiation penetration, shielding and health-effects are discussed to understand protection in case of a criticality accident. Fission, the fission products, particles and energy released are presented to appreciate the dangers of criticality. Nuclear cross sections are introduced to understand the effectiveness of slow neutrons to produce fission. Chain reactors are presented as an economy; effective use of the neutrons from fission leads to more fission resulting in a power reactor or a criticality excursion. The six-factor formula is presented for managing the neutron budget. This leads to concepts of material and geometric buckling which are used in simple calculations to assure safety from criticality. Experimental measurements and computer code calculations of criticality are discussed. To emphasize the reality, historical criticality accidents are presented in a table with major ones discussed to provide lessons-learned. Finally, standards, NRC guides and regulations, and DOE orders relating to criticality protection are presented.

  20. The relation between X-ray spectral index and the Eddington ratio in AGNs

    E-Print Network [OSTI]

    W. Bian

    2005-08-26T23:59:59.000Z

    Using the H$\\beta$ linewidth, we obtained the virial central supermassive black hole masses and then the Eddington ratios in a sample of broad-line AGNs and NLS1s observed by ASCA. Combined with the data from ROSAT and Chandra observations, We found a strong correlation between hard/soft X-ray photon index and the Eddington ratio. Such a correlation can be understood by a two-zone accretion flow model, in which zone is a thin disk and the inner zone is an advection-dominated accretion flow (ADAF) disk. The relation between X-ray photon index and the Eddington ratio may account for NLS1s with not too steep X-ray photon index founded by SDSS. If this relation is directly related to the accretion disk, it may also exist in the accretion disk of different scales (such as microquasar).

  1. Variable VHE gamma-ray emission from non-blazar AGNs

    E-Print Network [OSTI]

    F. M. Rieger; F. A. Aharonian

    2008-05-27T23:59:59.000Z

    The observation of rapidly variable very high energy (VHE) gamma-rays from non-aligned active galactic nuclei (AGNs), as reported from M87, proves challenging for conventional theoretical acceleration and emission models. We re-examine the centrifugal acceleration of particles by rotating jet magnetospheres in the vicinity of accreting supermassive black hole systems and analyze the energy constraints imposed for highly underluminous systems. Applications are presented for conditions expected to be present in the radio galaxy M87, assuming accretion onto the central black hole to occur in an advection-dominated (ADAF) mode. We show that for a highly underluminous source like M87, centrifugally accelerated electrons may reach Lorentz factors up to $\\gamma \\sim (10^7-10^8)$, allowing inverse Compton (Thomson) upscattering of sub-mm disk photons to the TeV regime. Upscattering of Comptonized disk photons results in a flat TeV spectrum $L_{\

  2. Kinematic Linkage Between the Broad and Narrow Line Emitting Gas in AGN

    E-Print Network [OSTI]

    R. Zamanov; P. Marziani; J. W. Sulentic; M. Calvani; D. Dultzin-Hacyan; R. Bachev

    2002-07-18T23:59:59.000Z

    We investigate the radial velocity difference between the [OIII]5007,4959 and H-beta lines for a sample of 200 low redshift AGN. We identify seven objects showing an [OIII]5007 blueshift relative to H-beta with amplitude larger than 250 km/s (blue "outliers"). These line shifts are found in sources where the broad high ionization lines (e.g. CIV1549) also show a large systematic blueshift. Such blueshifts occur only in the population A region of the Eigenvector 1 parameter domain (that also contains NLSy1 sources). We suggest that [OIII] blueshifts are also associated with the high ionization outflow originating in these sources. This is a direct kinematic linkage between narrow and broad line emitting gas.

  3. Temperature Profiles and the Effect of AGN on Submillimeter Emission from BLAST Observations of Resolved Galaxies

    E-Print Network [OSTI]

    Wiebe, Donald V; Bock, James J; Chapin, Edward L; Devlin, Mark J; Dicker, Simon; Griffin, Matthew; Gundersen, Joshua O; Halpern, Mark; Hargrave, Peter C; Hughes, David H; Klein, Jeff; Marsden, Gaelen; Martin, Peter G; Mauskopf, Philip; Netterfield, Calvin B; Olmi, Luca; Pascale, Enzo; Patanchon, Guillaume; Rex, Marie; Scott, Douglas; Semisch, Christopher; Thomas, Nicholas; Truch, Matthew D P; Tucker, Carole; Tucker, Gregory S; Viero, Marco P

    2009-01-01T23:59:59.000Z

    Over the course of two flights, the Balloon-borne Large Aperture Submillimeter Telescope (BLAST) made resolved maps of seven nearby (BLAST05), BLAST observed a single nearby galaxy, NGC 4565. During the December 2006 flight from Antarctica (BLAST06), BLAST observed the nearby galaxies NGC 1097, NGC 1291, NGC 1365, NGC 1512, NGC 1566, and NGC 1808. We fit physical dust models to a combination of BLAST observations and other available data for the the galaxies with Spitzer data. We fit a modified blackbody to the remaining galaxies to obtain total dust mass and mean dust temperature. For the four galaxies with Spitzer data, we also produce maps and radial profiles of dust column density and temperature. We measure the fraction of BLAST detected flux originating from the central cores of these galaxies and use this to calculate a "core fraction", an upper limit on the "AGN fraction" of submillimeter detected galaxies. Fin...

  4. Computer science approach to the stellar fabric of violent starforming regions in AGN

    E-Print Network [OSTI]

    Terlevich, E; Torres-Papaqui, J P; Estrada-Piedra, T; Fuentes, O; Solorio, T; Bressan, S

    2004-01-01T23:59:59.000Z

    In order to analyse the large numbers of Seyfert galaxy spectra available at present, we are testing new techniques to derive their physical parameters fastly and accurately. We present an experiment on such a new technique to segregate old and young stellar populations in galactic spectra using machine learning methods. We used an ensemble of classifiers, each classifier in the ensemble specializes in young or old populations and was trained with locally weighted regression and tested using ten-fold cross-validation. Since the relevant information concentrates in certain regions of the spectra we used the method of sequential floating backward selection offline for feature selection. Very interestingly, the application to Seyfert galaxies proved that this technique is very insensitive to the dilution by the Active Galactic Nucleus (AGN) continuum. Comparing with exhaustive search we concluded that both methods are similar in terms of accuracy but the machine learning method is faster by about two orders of m...

  5. Computer science approach to the stellar fabric of violent starforming regions in AGN

    E-Print Network [OSTI]

    E. Terlevich; R. Terlevich; J. P. Torres Papaqui; T. Estrada Piedra; O. Fuentes; T. Solorio; S. Bressan

    2004-07-28T23:59:59.000Z

    In order to analyse the large numbers of Seyfert galaxy spectra available at present, we are testing new techniques to derive their physical parameters fastly and accurately. We present an experiment on such a new technique to segregate old and young stellar populations in galactic spectra using machine learning methods. We used an ensemble of classifiers, each classifier in the ensemble specializes in young or old populations and was trained with locally weighted regression and tested using ten-fold cross-validation. Since the relevant information concentrates in certain regions of the spectra we used the method of sequential floating backward selection offline for feature selection. Very interestingly, the application to Seyfert galaxies proved that this technique is very insensitive to the dilution by the Active Galactic Nucleus (AGN) continuum. Comparing with exhaustive search we concluded that both methods are similar in terms of accuracy but the machine learning method is faster by about two orders of magnitude.

  6. High redshift AGNs and HI reionisation: limits from the unresolved X-ray background

    E-Print Network [OSTI]

    Haardt, Francesco

    2015-01-01T23:59:59.000Z

    The rapidly declining population of bright quasars at z~3 appears to make an increasingly small contribution to the ionising background at the HI Lyman limit. It is then generally though that massive stars in (pre-)galactic systems may provide the additional ionising flux needed to complete HI reionisation by z>6. A galaxy dominated background, however, may require that the escape fraction of Lyman continuum radiation from high redshift galaxies is as high as 10%, a value somewhat at odds with (admittedly scarce) observational constraints. High escape fractions from dwarf galaxies have been advocated, or, alternatively, a so-far undetected (or barely detected) population of unobscured, high-redshift faint AGNs. Here we question the latter hypothesis, and show that such sources, to be consistent with the measured level of the unresolved X-ray background at z=0, can provide a fraction of the HII filling factor not larger than 13% by z=6. The fraction rises to 10%.

  7. Privacy Notice | Critical Materials Institute

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    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItemResearch > TheNuclear Press Releases Archive PublicationsEconomyPrivacy Notice We

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  9. Security Notice | The Ames Laboratory

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    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItemResearch > TheNuclearHomeland ScienceInnovationScience andbarrierSecurity Notice

  10. EndNote X5 Basics What is EndNote?

    E-Print Network [OSTI]

    will need to choose between two installation types ­ Typical or Custom. If you choose Typical, you. This guide will show you the following basic steps for using EndNote: Opening or creating an EndNote Library Adding bibliographic references or citations to your library Using EndNote with Microsoft Word

  11. Preliminary Notice of Violation, Argonne National Laboratory...

    Office of Environmental Management (EM)

    Argonne National Laboratory-West - EA-2001-01 Preliminary Notice of Violation, Argonne National Laboratory-West - EA-2001-01 February 28, 2001 Issued to the University of Chicago...

  12. TESLA-LNF TECHNICAL NOTE Divisione Acceleratori

    E-Print Network [OSTI]

    TESLA-LNF TECHNICAL NOTE _____________ Divisione Acceleratori Frascati, November 20, 2003 Note: TESLA Report 2003-26 TESLA DAMPING RING: INJECTION/EXTRACTION SCHEMES WITH RF DEFLECTORS D. Alesini, S/extraction schemes in the Damping Ring of TESLA using RF deflectors. We illustrate different possible solutions using

  13. DANE TECHNICAL NOTE INFN -LNF, Accelerator Division

    E-Print Network [OSTI]

    Istituto Nazionale di Fisica Nucleare (INFN)

    (Chairman) F. Willeke, DESY 1. Follow up of previous Meeting The first report by the DANE Machine AdvisoryK K DANE TECHNICAL NOTE INFN - LNF, Accelerator Division Frascati, May 11, 2000 Note: G-55 Report by DANE Machine Advisory Panel on 2nd Meeting held on 4-5 May 2000 J. M. Jowett, CERN S. Myers, CERN

  14. DANE TECHNICAL NOTE INFN -LNF, Accelerator Division

    E-Print Network [OSTI]

    Istituto Nazionale di Fisica Nucleare (INFN)

    KKKK KKKK DANE TECHNICAL NOTE INFN - LNF, Accelerator Division Frascati, January 13, 1993 Note: IR to see how much heat has to be removed. The two main sources of heat are: 1) Resistive losses due. Technol. 5(6) 3446 (1987). #12;IR-1 pg. 6 APPENDIX IA Losses in the I.R. 1) Resistive losses in Be: dp dz

  15. BNL/SNS TECHNICAL NOTE R. Witkover

    E-Print Network [OSTI]

    BNL/SNS TECHNICAL NOTE NO. 049 R. Witkover September 23, 1998 ALTERNATING GRADIENT SYNCHROTRON-In-Gap" Monitor for the Spallation Neutron Source #12;SNS Technical Note Considerations in Designing a "Beam of approximately 550 nsec. With a design intensity of 1014 per pulse, un-controlled losses must be kept to a level

  16. DANE TECHNICAL NOTE INFN -LNF, Accelerator Division

    E-Print Network [OSTI]

    Istituto Nazionale di Fisica Nucleare (INFN)

    KKKK KKKK DANE TECHNICAL NOTE INFN - LNF, Accelerator Division Frascati, October 26, 1994 Note: RF enough (i.e. if the parasitic losses are low with respect to the energy left by each passing bunch-zero longitudinal electric field on the cavity axis. Being azimuthally symmetric, it is possible to calculate them

  17. DANE TECHNICAL NOTE INFN -LNF, Accelerator Division

    E-Print Network [OSTI]

    Istituto Nazionale di Fisica Nucleare (INFN)

    K K DANE TECHNICAL NOTE INFN - LNF, Accelerator Division Frascati, July 16, 1996 Note: RF-19 losses and prevents to reach the operating voltage range. The RF cavity of the DANE -Factory Accumulator and electrical conductivities. Multipactoring (MP) is a phenomenon of resonant electron discharge which can occur

  18. DANE TECHNICAL NOTE INFN -LNF, Accelerator Division

    E-Print Network [OSTI]

    Istituto Nazionale di Fisica Nucleare (INFN)

    K K DANE TECHNICAL NOTE INFN - LNF, Accelerator Division Frascati, December 14, 1995 Note: CD-5, are also needed in order to minimise the losses. In order to use this device as a transverse kicker, two) excitation. #12;CD-5 pg. 3 The combined magnetic and electric field gives a net deflecting Lorentz force

  19. DANE TECHNICAL NOTE INFN -LNF, Accelerator Division

    E-Print Network [OSTI]

    Istituto Nazionale di Fisica Nucleare (INFN)

    KKKK KKKK DANE TECHNICAL NOTE INFN - LNF, Accelerator Division Frascati, Sept. 26, 1991 Note: RF-4 and vacuum simpler and less expensive. The cavity will be made of copper which has better electrical and thermal conductivity to reduce the RF losses and keep the cooling easier. #12;RF-4 pg. 2 Multipacting (MP

  20. Date Initials Treatment Notes: Initial Observation

    E-Print Network [OSTI]

    Shahriar, Selim

    by replacing this notice with a CCM cage card no later than 10 AM on: ___/___/___ Unclaimed animals become the property of CCM and will be euthanized Guide to CCM Cage Cards OVERCROWDED CAGE PI be used. Mortality Report CCM will dispose of the animal(s) after 72 hours if not claimed

  1. APPLICATION NOTE PCA82C250 / 251

    E-Print Network [OSTI]

    Kozak, Victor R.

    to 1 Mbit/s over a two-wire differential bus line, which is the transmission medium being specified, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted bus protocol being primarily intended for transmission of control related data between a number of bus

  2. Notice of Public Meeting, Federal Register, 66 FR 50177, October...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Public Meeting, Federal Register, 66 FR 50177, October 2, 2001 Notice of Public Meeting, Federal Register, 66 FR 50177, October 2, 2001 Document displays a notice of public meeting...

  3. Preliminary Notice of Violation, Los Alamos National Security...

    Office of Environmental Management (EM)

    0-04 Preliminary Notice of Violation, Los Alamos National Security, LLC - WEA-2010-04 October 18, 2010 Preliminary Notice of Violation issued to Los Alamos National Security, LLC...

  4. Preliminary Notice of Violation, Los Alamos National Security...

    Energy Savers [EERE]

    Preliminary Notice of Violation, Los Alamos National Security, LLC - WEA-2012-03 Preliminary Notice of Violation, Los Alamos National Security, LLC - WEA-2012-03 October 17, 2012...

  5. AeroSys: Test Notice (2009) | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    Test Notice (2009) AeroSys: Test Notice (2009) September 24, 2009 After examining AeroSys data, DOE concluded that the AeroSys data were insufficient to confirm whether Aerosys...

  6. EIS-0447: EPA Notice of Availability of Draft Environmental Impact...

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    EIS-0447-DEIS-EPANOA-2013.pdf More Documents & Publications EIS-0460: EPA Notice of Availability of Final Environmental Impact Statement EIS-0403-S1: EPA Notice of Availability of...

  7. EIS-0385: EPA Notice of Availability of the Final Environmental...

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    EIS-0385-EPANOA-FEIS-2006.pdf More Documents & Publications EIS-0361: EPA Notice of Availability of the Draft Environmental Impact Statement EIS-0448: Notice of Adoption of an...

  8. EIS-0472: EPA Notice of Availability of Final Programmatic Environment...

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    S-0472-FPEIS-EPA-NOA-2014.pdf More Documents & Publications EIS-0487: EPA Notice of Availability of Draft Environmental Impact Statement EIS-0481: EPA Notice of Availability of...

  9. Notice of Availability, Federal Register, 75 FR 78231, December...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    75 FR 78231, December 15, 2010 Notice of Availability, Federal Register, 75 FR 78231, December 15, 2010 Notice of availability for the Management of Energy and Water Efficiency in...

  10. EIS-0425: EPA Notice of Availability of a Final Environmental...

    Broader source: Energy.gov (indexed) [DOE]

    IS-0425-FEIS-EPA-NOA.2012.pdf More Documents & Publications EIS-0439: EPA Notice of Availability of the Draft Environmental Impact Statement EIS-0416: EPA Notice of Availability of...

  11. EIS-0460: EPA Notice of Availability of the Draft Environmental...

    Office of Environmental Management (EM)

    EPA Notice of Availability of the Draft Environmental Impact Statement EIS-0460: EPA Notice of Availability of the Draft Environmental Impact Statement FutureGen 2.0 Project,...

  12. EIS-0391: EPA Notice of Availability of the Draft Environmental...

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    WA EIS-0391-DEA-NOA-2009.pdf More Documents & Publications EIS-0387: EPA Notice of Availability of the Draft Environmental Impact Statement EIS-0183: EPA Notice of Availability of...

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    EIS-0407-NOA-FEIS-2010.pdf More Documents & Publications EIS-0435: EPA Notice of Availability of the Draft Environmental Impact Statement EIS-0407: EPA Notice of Availability of...

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    EIS-0387-DEIS-EPANOA-2009.pdf More Documents & Publications EIS-0391: EPA Notice of Availability of the Draft Environmental Impact Statement EIS-0183: EPA Notice of Availability of...

  15. EIS-0365: EPA Notice of Availability of the Final Environmental...

    Office of Environmental Management (EM)

    5: EPA Notice of Availability of the Final Environmental Impact Statement EIS-0365: EPA Notice of Availability of the Final Environmental Impact Statement Imperial-Mexicali 230-kV...

  16. EIS-0250: EPA Notice of Availability of the Draft Supplemental...

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    DEIS-EPANOA-S1S2-2nd-2007.pdf More Documents & Publications EIS-0357: EPA Notice of Availability of the Final Environmental Impact Statement EIS-0394: EPA Notice of Availability of...

  17. ENERGY EFFICIENCY AND CONSERVATION BLOCK GRANTS PROGRAM NOTICE...

    Energy Savers [EERE]

    ENERGY EFFICIENCY AND CONSERVATION BLOCK GRANTS PROGRAM NOTICE 10-012 ENERGY EFFICIENCY AND CONSERVATION BLOCK GRANTS PROGRAM NOTICE 10-012 DAVIS-BACON ACT WAGE RATES FOR...

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    Energy Savers [EERE]

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  19. Washington Notice of Construction Application under New Source...

    Open Energy Info (EERE)

    Washington Notice of Construction Application under New Source Review (Form ECY 070-410) Jump to: navigation, search OpenEI Reference LibraryAdd to library Form: Washington Notice...

  20. Preliminary Notice of Violation, Lockheed Martin Energy Systems...

    Office of Environmental Management (EM)

    Preliminary Notice of Violation, Lockheed Martin Energy Systems - EA-2000-11 Preliminary Notice of Violation, Lockheed Martin Energy Systems - EA-2000-11 August 24, 2000 Issued to...

  1. First systematic search for oxygen-line blobs at high redshift: Uncovering AGN feedback and star formation quenching

    SciTech Connect (OSTI)

    Yuma, Suraphong; Ouchi, Masami; Ono, Yoshiaki; Momose, Rieko [Institute for Cosmic Ray Research, The University of Tokyo, Kashiwa-no-ha, Kashiwa 277-8582 (Japan); Drake, Alyssa B.; Simpson, Chris [Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF (United Kingdom); Shimasaku, Kazuhiro; Nakajima, Kimihiko [Department of Astronomy, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan); Akiyama, Masayuki [Astronomical Institute, Tohoku University, Aoba-ku, Sendai 980-8578 (Japan); Mori, Masao; Umemura, Masayuki, E-mail: yuma@icrr.u-tokyo.ac.jp [Center for Computational Science, University of Tsukuba, Tsukuba, Ibaraki 305-8577 (Japan)

    2013-12-10T23:59:59.000Z

    We present the first systematic search for extended metal-line [O II] ??3726, 3729 nebulae, or [O II] blobs (O IIBs), at z = 1.2 using deep narrowband imaging with a survey volume of 1.9 × 10{sup 5} Mpc{sup 3} on the 0.62 deg{sup 2} sky of Subaru-XMM Deep Survey (SXDS) field. We discover a giant O IIB, called 'O IIB 1', with a spatial extent over ?75 kpc at a spectroscopic redshift of z = 1.18, and also identify a total of 12 O IIBs with a size of >30 kpc. Our optical spectrum of O IIB 1 presents [Ne V] ?3426 line at the 6? level, indicating that this object harbors an obscured type-2 active galactic nucleus (AGN). The presence of gas outflows in this object is suggested by two marginal detections of Fe II ?2587 absorption and Fe II* ?2613 emission lines both of which are blueshifted at as large as 500-600 km s{sup –1}, indicating that the heating source of O IIB 1 is AGN or associated shock excitation rather than supernovae produced by starbursts. The number density of O IIB 1-type giant blobs is estimated to be ?5 × 10{sup –6} Mpc{sup –3} at z ? 1.2, which is comparable with that of AGNs driving outflow at a similar redshift, suggesting that giant O IIBs are produced only by AGN activity. On the other hand, the number density of small O IIBs, 6 × 10{sup –5} Mpc{sup –3}, compared to that of z ? 1 galaxies in the blue cloud in the same M{sub B} range, may imply that 3% of star-forming galaxies at z ? 1 are quenching star formation through outflows involving extended [O II] emission.

  2. A pilot study of the radio-emitting AGN population: the emerging new class of FR0 radio-galaxies

    E-Print Network [OSTI]

    Baldi, Ranieri D; Giovannini, Gabriele

    2015-01-01T23:59:59.000Z

    We present the results of a pilot JVLA project aimed at studying the bulk of the radio-emitting AGN population, unveiled by the NVSS/FIRST and SDSS surveys.We obtained A-array observations at the JVLA at 1.4, 4.5, and 7.5 GHz for 12 sources of the SDSS/NVSS sample. The radio maps reveal compact unresolved or slightly resolved radio structures on a scale of 1-3 kpc, with only one exception of a FRI/FRII source extended over $\\sim$40 kpc. We isolate the radio core component in most of them. The sample splits into two groups. Four sources have small black hole (BH) masses (mostly $\\sim$10$^{7}$ M$_{\\odot}$) and are hosted by blue galaxies, often showing evidence of a contamination from star formation to their radio emission and associated with radio-quiet AGN. The second group consists in seven radio-loud AGN, which live in red massive ($\\sim10^{11}$ M$_{\\odot}$) early-type galaxies, with large BH masses ($\\gtrsim$10$^{8}$ M$_{\\odot}$), and spectroscopically classified as Low Excitation Galaxies, all characteris...

  3. The evolution of the X-ray luminosity functions of unabsorbed and absorbed AGNs out to z~5

    E-Print Network [OSTI]

    Aird, James; Georgakakis, Antonis; Nandra, Kirpal; Barro, Guillermo; Perez-Gonzalez, Pablo G

    2015-01-01T23:59:59.000Z

    We present new measurements of the evolution of the X-ray luminosity functions (XLFs) of unabsorbed and absorbed Active Galactic Nuclei (AGNs) out to z~5. We construct samples containing 2957 sources detected at hard (2-7 keV) X-ray energies and 4351 sources detected at soft (0.5-2 keV) energies from a compilation of Chandra surveys supplemented by wide-area surveys from ASCA and ROSAT. We consider the hard and soft X-ray samples separately and find that the XLF based on either (initially neglecting absorption effects) is best described by a new flexible model parametrization where the break luminosity, normalization and faint-end slope all evolve with redshift. We then incorporate absorption effects, separately modeling the evolution of the XLFs of unabsorbed ($20<\\log N_H<22$) and absorbed ($22<\\log N_H<24$) AGNs, seeking a model that can reconcile both the hard- and soft-band samples. We find that the absorbed AGN XLF generally has a lower break luminosity, a higher normalization, and a steeper...

  4. The Infrared Medium-Deep Survey II: How to Trigger Radio-AGN? Hints from Their Environments

    E-Print Network [OSTI]

    Karouzos, Marios; Kim, Jae-Woo; Lee, Seong-Kook; Chapman, Scott; Jeon, Yiseul; Choi, Changsu; Hong, Jueun; Hyun, Minhee; Jun, Hyunsung David; Kim, Dohyeong; Kim, Yongjung; Kim, Ji Hoon; Kim, Duho; Pak, Soojong; Park, Won-Kee; Tak, Yoon Chan; Yoon, Yongmin; Edge, Alastair

    2014-01-01T23:59:59.000Z

    Activity at the centers of galaxies, during which the central supermassive black hole is accreting material, is nowadays accepted to be rather ubiquitous and most probably a phase of every galaxy's evolution. It has been suggested that galactic mergers and interactions may be the culprits behind the triggering of nuclear activity. We use near-infrared data from the new Infrared Medium-Deep Survey (IMS) and the Deep eXtragalactic Survey (DXS) of the VIMOS-SA22 field and radio data at 1.4 GHz from the FIRST survey and a deep VLA survey to study the environments of radio-AGN over an area of ~25 sq. degrees and down to a radio flux limit of 0.1 mJy and a J-band magnitude of 23 mag AB. Radio-AGN are predominantly found in environments similar to those of control galaxies at similar redshift, J-band magnitude, and U-R rest-frame absolute color. However, a sub-population of radio-AGN is found in environments up to 100 times denser than their control sources. We thus preclude merging as the dominant triggering mechan...

  5. EVERY BCG WITH A STRONG RADIO AGN HAS AN X-RAY COOL CORE: IS THE COOL CORE-NONCOOL CORE DICHOTOMY TOO SIMPLE?

    SciTech Connect (OSTI)

    Sun, M., E-mail: msun@virginia.ed [Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904-4325 (United States)

    2009-10-20T23:59:59.000Z

    The radio active galactic nucleus (AGN) feedback in X-ray cool cores has been proposed as a crucial ingredient in the evolution of baryonic structures. However, it has long been known that strong radio AGNs also exist in 'noncool core' clusters, which brings up the question whether an X-ray cool core is always required for the radio feedback. In this work, we present a systematic analysis of brightest cluster galaxies (BCGs) and strong radio AGNs in 152 groups and clusters from the Chandra archive. All 69 BCGs with radio AGN more luminous than 2 x 10{sup 23} W Hz{sup -1} at 1.4 GHz are found to have X-ray cool cores. BCG cool cores can be divided into two classes: the large cool core (LCC) class and the corona class. Small coronae, easily overlooked at z > 0.1, can trigger strong heating episodes in groups and clusters, long before LCCs are formed. Strong radio outbursts triggered by coronae may destroy embryonic LCCs and thus provide another mechanism to prevent the formation of LCCs. However, it is unclear whether coronae are decoupled from the radio feedback cycles as they have to be largely immune to strong radio outbursts. Our sample study also shows the absence of groups with a luminous cool core while hosting a strong radio AGN, which is not observed in clusters. This points to a greater impact of radio heating on low-mass systems than clusters. Few L {sub 1.4GHz} > 10{sup 24} W Hz{sup -1} radio AGNs (approx16%) host an L {sub 0.5-10keV} > 10{sup 42} erg s{sup -1} X-ray AGN, while above these thresholds, all X-ray AGNs in BCGs are also radio AGNs. As examples of the corona class, we also present detailed analyses of a BCG corona associated with a strong radio AGN (ESO 137-006 in A3627) and one of the faintest coronae known (NGC 4709 in the Centaurus cluster). Our results suggest that the traditional cool core/noncool core dichotomy is too simple. A better alternative is the cool core distribution function, with the enclosed X-ray luminosity or gas mass.

  6. Workshop Notes from ""Compressed Natural Gas and Hydrogen Fuels...

    Broader source: Energy.gov (indexed) [DOE]

    Workshop Notes from ""Compressed Natural Gas and Hydrogen Fuels: Lessons Learned for the Safe Deployment of Vehicles"" Workshop, December 10-11, 2009 Workshop Notes from...

  7. The Lick AGN Monitoring Project 2011: Reverberation Mapping of Markarian 50

    E-Print Network [OSTI]

    Barth, A J; Thorman, S J; Bennert, V N; Sand, D J; Li, W; Canalizo, G; Filippenko, A V; Gates, E L; Greene, J E; Malkan, M A; Stern, D; Treu, T; Woo, J -H; Assef, R J; Bae, H -J; Brewer, B J; Buehler, T; Cenko, S B; Clubb, K I; Cooper, M C; Diamond-Stanic, A M; Hiner, K D; Hoenig, S F; Joner, M D; Kandrashoff, M T; Laney, C D; Lazarova, M S; Nierenberg, A M; Park, D; Silverman, J M; Son, D; Sonnenfeld, A; Tollerud, E J; Walsh, J L; Walters, R; da Silva, R L; Fumagalli, M; Gregg, M D; Harris, C E; Hsiao, E Y; Lee, J; Lopez, L; Rex, J; Suzuki, N; Trump, J R; Tytler, D; Worseck, G; Yesuf, H M

    2011-01-01T23:59:59.000Z

    The Lick AGN Monitoring Project 2011 observing campaign was carried out over the course of 11 weeks in Spring 2011. Here we present the first results from this program, a measurement of the broad-line reverberation lag in the Seyfert 1 galaxy Mrk 50. Combining our data with supplemental observations obtained prior to the start of the main observing campaign, our dataset covers a total duration of 4.5 months. During this time, Mrk 50 was highly variable, exhibiting a maximum variability amplitude of a factor of 4 in the U-band continuum and a factor of 2 in the H-beta line. Using standard cross-correlation techniques, we find that H-beta and H-gamma lag the V-band continuum by tau_cen = 10.64(-0.93,+0.82) and 8.43(-1.28,+1.30) days, respectively, while the lag of He II 4686 is unresolved. The H-beta line exhibits a symmetric velocity-resolved reverberation signature with shorter lags in the high-velocity wings than in the line core, consistent with an origin in a broad-line region dominated by orbital motion r...

  8. Relativistic spine jets from Schwarzschild black holes: "Application to AGN radioloud sources"

    E-Print Network [OSTI]

    Meliani, Z; Tsinganos, K; Trussoni, E; Cayatte, V

    2010-01-01T23:59:59.000Z

    The two types of Fanaroff-Riley radio loud galaxies, FRI and FRII, exhibit strong jets but with different properties. These differences may be associated to the central engine and/or the external medium. Aims: The AGN classification FRI and FRII can be linked to the rate of electromagnetic Poynting flux extraction from the inner corona of the central engine by the jet. The collimation results from the distribution of the total electromagnetic energy across the jet, as compared to the corresponding distribution of the thermal and gravitational energies. We use exact solutions of the fully relativistic magnetohydrodynamical (GRMHD) equations obtained by a nonlinear separation of the variables to study outflows from a Schwarzschild black hole corona. A strong correlation is found between the jet features and the energetic distribution of the plasma of the inner corona which may be related to the efficiency of the magnetic rotator. It is shown that observations of FRI and FRII jets may be partially constrained by...

  9. Radiation Pressure Supported AGN Tori with Hard X-Ray and Stellar Heating

    E-Print Network [OSTI]

    Jiming Shi; Julian H. Krolik

    2008-02-13T23:59:59.000Z

    The dynamics and structure of toroidal obscuration around AGN remain uncertain and controversial. In this paper we extend earlier work on the dynamical role of infrared radiation pressure by adding the effects of two kinds of distributed heating: Compton-heating due to hard X-rays from the nucleus and local starlight heating. We find numerical solutions to the axisymmetric hydrostatic equilibrium, energy balance, and photon diffusion equations including these effects. Within the regime of typical parameters, the two different sources of additional heating have very similar effects: the density profile within the torus becomes shallower both radially and vertically, but for plausible heating rates, there is only minor change (relative to the source-free case) in the distribution of column density with solid angle. The most interesting consequence of distributed heating is that it selects out a relatively narrow range of parameters permitting an equilibrium, particularly $(L/L_E)/\\tau_T$. We discuss the implications of both the narrowness of the permitted range and its approximate coincidence with the range inferred from observations.

  10. Optical Nuclei of Radio-loud AGN and the Fanaroff-Riley Divide

    E-Print Network [OSTI]

    P. Kharb; P. Shastri

    2004-08-16T23:59:59.000Z

    We investigate the nature of the point-like optical ``cores'' that have been found in the centres of the host galaxies of a majority of radio galaxies by the Hubble Space Telescope. We examine the evidence that these optical cores are relativistically beamed, and look for differences in the behaviour of the cores found in radio galaxies of the two Fanaroff-Riley types. We also attempt to relate this behaviour to the properties of the optical nuclei in their highly beamed counterparts (the BL Lac objects and radio-loud quasars) as hypothesized by the simple Unified Scheme. Simple model-fitting of the data suggests that the emission may be coming from a non-thermal relativistic jet. It is also suggestive that the contribution from an accretion disk is not significant for the FRI objects and for the narrow-line radio galaxies of FRII type, while it may be significant for the Broad-line objects, and consistent with the idea that the FRII optical cores seem to suffer from extinction due to an obscuring torus while the FRI optical cores do not. These results are in agreement with the Unified Scheme for radio-loud AGNs.

  11. Axion-like particles explain the unphysical redshift-dependence of AGN gamma-ray spectra

    E-Print Network [OSTI]

    Galanti, Giorgio; De Angelis, Alessandro; Bignami, Giovanni F

    2015-01-01T23:59:59.000Z

    Blazars are a class of AGN known to be powerful very-high-energy (VHE, 100 GeV - 100 TeV) celestial gamma-ray emitters. At the time of writing, 41 blazars, spread all over the sky and with known redshift in the range $0.0215 \\leq z \\leq 0.635$ have been observed in the VHE band by the Imaging Atmospheric Cherenkov Telescopes H.E.S.S., MAGIC and VERITAS. Thus, they represent an isotropic and relatively local extragalactic sample, unaffected by significant cosmological evolution. The blazar emitted spectra are well fitted by a power law with index $\\Gamma_{\\rm em}$. We show that the $\\Gamma_{\\rm em}$ distribution exhibits an unexpected and previously unnoticed unphysical redshift-dependence. We demonstrate that this result is not due to any selection effect. It is difficult to imagine an intrinsic mechanism which could lead to such a spectral variation, and so this result seriously challenges the conventional view. We propose that such a behaviour is explained by oscillations between the VHE gamma-rays and Axio...

  12. Chemical Abundances in AGN Environment: X-Ray/UV Campaign on the MRK 279 Outflow

    E-Print Network [OSTI]

    Nahum Arav; Jack R. Gabel; Kirk T. Korista; Jelle S. Kaastra; Gerard A. Kriss; Ehud Behar; Elisa Costantini; C. Martin Gaskell; Ari Laor; Nalaka Kodituwakku; Daniel Proga; Masao Sako; Jennifer E. Scott; Katrien C. Steenbrugge

    2006-11-29T23:59:59.000Z

    We present the first reliable determination of chemical abundances in an AGN outflow. The abundances are extracted from the deep and simultaneous FUSE and HST/STIS observations of Mrk 279. This data set is exceptional for its high signal-to-noise, unblended doublet troughs and little Galactic absorption contamination. These attributes allow us to solve for the velocity-dependent covering fraction, and therefore obtain reliable column densities for many ionic species. For the first time we have enough such column densities to simultaneously determine the ionization equilibrium and abundances in the flow. Our analysis uses the full spectral information embedded in these high-resolution data. Slicing a given trough into many independent outflow elements yields the extra constraints needed for a physically meaningful abundances determination. We find that relative to solar the abundances in the Mrk 279 outflow are (linear scaling): carbon 2.2+/-0.7, nitrogen 3.5+/-1.1 and oxygen 1.6+/-0.8. Our UV-based photoionization and abundances results are in good agreement with the independent analysis of the simultaneous Mrk 279 X-ray spectra. This is the best agreement between the UV and X-ray analyses of the same outflow to date.

  13. On the origin of the C IV Baldwin effect in AGN

    E-Print Network [OSTI]

    Alexei Baskin; Ari Laor

    2004-03-16T23:59:59.000Z

    The origin of the luminosity dependence of the equivalent width (EW) of broad emission lines in AGN (the Baldwin effect) is not firmly established yet. We explore this question for the broad C IV \\lambda 1549 line using the Boroson & Green sample of the 87 z < 0.5 Bright Quasar Survey (BQS) quasars. Useful UV spectra of the C IV region are available for 81 of the objects, which are used to explore the dependence of the C IV EW on various emission properties. We confirm earlier results on the strong correlations of the C IV EW with some of the emission parameters which define the Boroson & Green Eigenvector 1, and with the optical to X-ray slope \\alpha_ox. In addition, we find a strong correlation of the C IV EW with the relative accretion rate, L/L_Edd. Since L/L_Edd drives some of the Eigenvector 1 correlations, it may be the primary physical parameter which drives the Baldwin effect for C IV.

  14. Observing faint targets with MIDI at the VLTI -- The MIDI AGN Large Programme experience

    E-Print Network [OSTI]

    Burtscher, Leonard; Jaffe, Walter J; Meisenheimer, Klaus

    2012-01-01T23:59:59.000Z

    In order to put MIDI/VLTI observations of AGNs on a significant statistical basis, the number of objects had to be increased dramatically from the few prominent bright cases to over 20. For this, correlated fluxes as faint as ~ 150 mJy need to be observed, calibrated and their errors be estimated reliably. We have developed new data reduction methods for the coherent estimation of correlated fluxes with the Expert Work Station (EWS). They increase the signal/noise of the reduced correlated fluxes by decreasing the jitter in the group delay estimation. While correlation losses cannot be fully avoided for the weakest objects even with the improved routines, we have developed a method to simulate observations of weak targets and can now detect --- and correct for --- such losses. We have analyzed all sources of error that are relevant for the observations of weak targets. Apart from the photon-noise error, that is usually quoted, there is an additional error from the uncertainty in the calibration (i.e. the conv...

  15. Notes on Slovene and Slavic Etymology

    E-Print Network [OSTI]

    Hamp, Eric P.

    1997-01-01T23:59:59.000Z

    The notes present critiques of F. Bezlaj's Etymological Dictionary of the Slovene Language and new proposals for the etymology of the words krma 'animal feed', Krma (toponym), kašelj 'cough', ogenj 'flame, fire', and oglje 'charcoal'....

  16. A. La Rosa Lecture Notes APPLIED OPTICS

    E-Print Network [OSTI]

    A. La Rosa Lecture Notes APPLIED OPTICS _______________________________________________________________________________ The variational principle and ray propagation The ray equation Propagation on a lenslike media: GRIN lenses Ref: A. Yariv and P. Yeh, "Photonics," Oxford University Press. Chapter 2. The ray equation obtained from

  17. A. La Rosa Lecture Notes APPLIED OPTICS

    E-Print Network [OSTI]

    _______________________________________________________________________________ Rays and Optical beams Ref: A. Yariv and P. Yeh, "Photonics," Oxford University Press. Chapter 2. IA. La Rosa Lecture Notes APPLIED OPTICS. Ray Matrices I.A Special cases Case: Propagation through a thin lens Case: Propagation through

  18. Data Mining and Knowledge Discovery: Practice Notes

    E-Print Network [OSTI]

    Novak, Petra Kralj

    1 Data Mining and Knowledge Discovery: Practice Notes Petra Kralj Novak Petra.Kralj.Novak@ijs.si and exam · 2013/1/15: Written exam, seminar proposal discussion · 2013/2/12: Data mining seminar

  19. Data Mining and Knowledge Discovery: Practice Notes

    E-Print Network [OSTI]

    Novak, Petra Kralj

    1 Data Mining and Knowledge Discovery: Practice Notes Petra Kralj Novak Petra.Kralj.Novak@ijs.si on Weka 3: Descriptive data mining ­ Discussion about seminars and exam · 2013/12/16: Written exam

  20. Lecture Notes in Secret Sharing Carles Padro

    E-Print Network [OSTI]

    Lecture Notes in Secret Sharing Carles Padr´o Nanyang Technological University, Singapore Version 2.7 Exercises . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2 Secret Sharing.2 Secret Sharing Schemes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.3 Threshold Secret

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    reviewed CA SWRCB's request to revise its EPA- authorized Part 123-EPA Administered Permit Programs: The National Pollutant Discharge Elimination System program and, based on...

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    alternatives for the storage, processing, and disposal of civilian and defense spent nuclear fuel and nuclear waste. The Co-chairs of the Commission requested the formation of...

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    Securities and Exchange Commission, at 10 (Nov. 5, 2013) https:www.sec.govArchivesedgar data1065059000106505913000049 usu-2013930x10q.htm (accessed Feb. 22, 2015). When...

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    on the renewal of the MSGP. The initiation letter was posted on the tribal portal Web site at http: www.epa.govtribalconsultation. * January 15, 2013-EPA held an...

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    of growing importance due to the introduction of variable renewable technology (solar and wind) and wider use of demand response programs. The combination of more renewable power...

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    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E VProcess| Department of189

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    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E VProcess|191887619 Federal

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    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E VProcess|191887619

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    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E VProcess|1918876198294

  6. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E VProcess|1918876198294026

  7. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E

  8. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal Register / Vol.

  9. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal Register /

  10. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal Register /43

  11. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal Register /430

  12. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal Register

  13. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal Register024

  14. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal Register0243

  15. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal Register0243956

  16. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal

  17. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal112 Federal

  18. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal112 Federal6

  19. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal112 Federal68

  20. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal112 Federal6861

  1. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal112

  2. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal112493 Federal

  3. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal112493

  4. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal11249369 Federal

  5. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal11249369

  6. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal11249369076

  7. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557 Federal11249369076443

  8. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557

  9. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557

  10. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312 Federal Register /

  11. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312 Federal Register

  12. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312 Federal Register8430

  13. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312 Federal

  14. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312 Federal997 Federal

  15. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312 Federal997

  16. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312 Federal99777 Federal

  17. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312 Federal99777

  18. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312 Federal99777 Federal

  19. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312 Federal99777

  20. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312 Federal99777081

  1. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312 Federal9977708130

  2. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312 Federal997770813066

  3. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312

  4. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107 Federal Register

  5. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107 Federal

  6. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107 Federal666

  7. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107 Federal666489

  8. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107 Federal666489189

  9. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107

  10. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107538 Federal

  11. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107538 Federal2992

  12. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107538 Federal299262

  13. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107538

  14. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107538559 Federal

  15. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107538559 Federal

  16. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107538559 Federal666

  17. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107538559 Federal6660

  18. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107538559

  19. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107538559995 Federal

  20. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107538559995

  1. Notices

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107538559995038

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    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E557312107538559995038667

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    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment of Energy NorthB O N N E5573121075385599950386678

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    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

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  11. Notice of Financial Assistance Award

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  12. Other Notices | Department of Energy

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  16. Notice to Users - Pantex Plant

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  17. THE SPATIAL CLUSTERING OF ROSAT ALL-SKY SURVEY AGNs. II. HALO OCCUPATION DISTRIBUTION MODELING OF THE CROSS-CORRELATION FUNCTION

    SciTech Connect (OSTI)

    Miyaji, Takamitsu; Aceves, Hector [Instituto de AstronomIa, Universidad Nacional Autonoma de Mexico, Ensenada, Baja California (Mexico); Krumpe, Mirko; Coil, Alison L., E-mail: miyaji@astrosen.unam.mx [University of California, San Diego, Center for Astrophysics and Space Sciences, 9500 Gilman Drive, La Jolla, CA 92093-0424 (United States)

    2011-01-10T23:59:59.000Z

    This is the second paper of a series that reports on our investigation of the clustering properties of active galactic nuclei (AGNs) in the ROSAT All-Sky Survey (RASS) through cross-correlation functions (CCFs) with Sloan Digital Sky Survey (SDSS) galaxies. In this paper, we apply the Halo Occupation Distribution (HOD) model to the CCFs between the RASS broad-line AGNs with SDSS luminous red galaxies (LRGs) in the redshift range 0.16 < z < 0.36 that was calculated in Paper I. In our HOD modeling approach, we use the known HOD of LRGs and constrain the HOD of the AGNs by a model fit to the CCF. For the first time, we are able to go beyond quoting merely a 'typical' AGN host halo mass, M{sub h}, and model the full distribution function of AGN host dark matter halos. In addition, we are able to determine the large-scale bias and the mean M{sub h} more accurately. We explore the behavior of three simple HOD models. Our first model (Model A) is a truncated power-law HOD model in which all AGNs are satellites. With this model, we find an upper limit to the slope ({alpha}) of the AGN HOD that is far below unity. The other two models have a central component, which has a step function form, where the HOD is constant above a minimum mass, without (Model B) or with (Model C) an upper mass cutoff, in addition to the truncated power-law satellite component, similar to the HOD that is found for galaxies. In these two models we find that the upper limits on {alpha} are still below unity, with {alpha} {approx}< 0.95 and {alpha} {approx}< 0.84 for Models B and C, respectively. Our analysis suggests that the satellite AGN occupation increases slower than, or may even decrease with, M{sub h}, in contrast to the satellite HODs of luminosity-threshold samples of galaxies, which, in contrast, grow approximately as (N{sub s}) {proportional_to} M{sup {alpha}}{sub h} with {alpha} {approx} 1. These results are consistent with observations that the AGN fraction in groups and clusters decreases with richness.

  18. The Spatial Clustering of ROSAT All-Sky Survey AGN: I. The cross-correlation function with SDSS Luminous Red Galaxies

    E-Print Network [OSTI]

    Krumpe, Mirko; Coil, Alison L

    2010-01-01T23:59:59.000Z

    We investigate the clustering properties of ~1550 broad-line AGNs at =0.25 detected in the ROSAT All-Sky Survey (RASS) through their measured cross-correlation function (CCF) with ~46000 Luminous Red Galaxies (LRGs) in the Sloan Digital Sky Survey. By measuring the cross-correlation of our AGN sample with a larger tracer set of LRGs, we both minimize shot noise errors due to the relatively small AGN sample size and avoid systematic errors due to the spatially-varying Galactic absorption that would affect direct measurements of the auto-correlation function (ACF) of the AGN sample. The measured ACF correlation length for the total RASS-AGN sample (=1.5 x 10^(44) erg/s) is r_0=4.3^{+0.4}_{-0.5} h^(-1) Mpc and the slope \\gamma=1.7^{+0.1}_{-0.1}. Splitting the sample into low and high L_X samples at L_(0.5-10 keV)=10^(44) erg/s, we detect an X-ray luminosity-dependence of the clustering amplitude at the ~2.5 \\sigma level. The low L_X sample has r_0=3.3^{+0.6}_{-0.8} h^(-1) Mpc (\\gamma=1.7^{+0.4}_{-0.3}), which is...

  19. ENERGIES RENOVABLES NOTES FINALS 2006 COGNOMS, NOM ASSISTNCIA TREBALL NOTA

    E-Print Network [OSTI]

    Batiste, Oriol

    ENERGIES RENOVABLES NOTES FINALS 2006 COGNOMS, NOM ASSISTÃ?NCIA TREBALL NOTA ALCOVERRO VIDAL, MARCEL

  20. Luminous HC3N line emission in NGC4418 - buried AGN or nascent starburst?

    E-Print Network [OSTI]

    S. Aalto; R. Monje; S. Martin

    2007-05-21T23:59:59.000Z

    IRAM 30m observations reveal that the deeply obscured IR-luminous galaxy NGC4418 has a rich molecular chemistry - including unusually luminous HC3N line emission. We furthermore detect: ortho-H2CO 2-1, 3-2; CN 1-0, 2-1; HCO+, 1-0. 3-2, HCN 3-2, HNC 1-0, 3-2 (and tentatively OCS 12-11). The HCN, HCO+, H2CO and CN line emission can be fitted to densities of n=5 x 10E4 - 10E5 cm-3 and gas temperatures Tk=80-150 K. Both HNC and HC3N are, however, significantly more excited than the other species which requires higher gas densities - or radiative excitation through e.g. mid-IR pumping. The HCN line intensity is fainter than that of HCO+ and HNC for the 3-2 transition, in contrast to previous findings for the 1-0 lines where the HCN emission is the most luminous. We tentatively suggest that the observed molecular line emission is consistent with a young starburst, where the emission can be understood as emerging from dense, warm gas with an additional PDR component. We find that X-ray chemistry is not required to explain the observed mm line emission, including the HCN/HCO+ 1-0 and 3-2 line ratios. The luminous HC3N line emission is an expected signature of dense, starforming gas. A deeply buried AGN can not be excluded, but its impact on the surrounding molecular medium is then suggested to be limited. However, detailed modelling of HC3N abundances in X-ray dominated regions (XDRs) should be carried out. The possibility of radiative excitation should also be further investigated