Fermi Large Area Telescope observations of the active galaxy 4C +55.17: Steady, hard gamma-ray emission and its implications
Abstract
Here, we report Fermi Large Area Telescope (LAT) observations and broadband spectral modeling of the radio-loud active galaxy 4C +55.17 (z = 0.896), formally classified as a flat-spectrum radio quasar. Using 19 months of all-sky survey Fermi-LAT data, we detect a γ-ray continuum extending up to an observed energy of 145 GeV, and furthermore we find no evidence of γ-ray variability in the source over its observed history. We illustrate the implications of these results in two different domains. First, we investigate the origin of the steady γ-ray emission, where we re-examine the common classification of 4C +55.17 as a quasar-hosted blazar and consider instead its possible nature as a young radio source. We analyze and compare constraints on the source physical parameters in both blazar and young radio source scenarios by means of a detailed multiwavelength analysis and theoretical modeling of its broadband spectrum. Second, we show that the γ-ray spectrum may be formally extrapolated into the very high energy (VHE, ≥100 GeV) range at a flux level detectable by the current generation of ground-based Cherenkov telescopes. This enables us to place constraints on models of extragalactic background light within LAT energies and features the source as a promisingmore »
- Authors:
-
- NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States)
- Univ. degli Studi di Torino, Torino (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Torino (Italy); Univ. of Pennsylvania, Philadelphia, PA (United States); Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
- Nicolaus Copernicus Astronomical Center, Warsaw (Poland)
- Institute of Space and Astronautical Science, Kanagawa (Japan); Jagiellonian Univ., Krakow (Poland)
- National Academy of Science, Washington, D.C. (United States); Naval Research Lab., Washington, D.C. (United States)
- Stanford Univ., Stanford, CA (United States)
- Univ. of California, Santa Cruz, CA (United States)
- Istituto Nazionale di Fisica Nucleare, Pisa (Italy)
- Naval Research Lab., Washington, D.C. (United States)
- Univ. di Bologna, Bologna (Italy); Istituto di Radioastronomia INAF, Bologna (Italy)
- Univ. of Chicago, Chicago, IL (United States)
- Istituto di Radioastronomia INAF, Bologna (Italy)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1357198
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 738; Journal Issue: 2; Journal ID: ISSN 0004-637X
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; galaxies: active; galaxies: individual (4C+55.17); galaxies: jets; gamma rays: galaxies; radiation mechanisms: non-thermal
Citation Formats
McConville, W., Ostorero, L., Moderski, R., Stawarz, Ł., Cheung, C. C., Ajello, M., Bouvier, A., Bregeon, J., Donato, D., Finke, J., Furniss, A., McEnery, J. E., Monzani, M. E., Orienti, M., Reyes, L. C., Rossetti, A., and Williams, D. A. Fermi Large Area Telescope observations of the active galaxy 4C +55.17: Steady, hard gamma-ray emission and its implications. United States: N. p., 2011.
Web. doi:10.1088/0004-637X/738/2/148.
McConville, W., Ostorero, L., Moderski, R., Stawarz, Ł., Cheung, C. C., Ajello, M., Bouvier, A., Bregeon, J., Donato, D., Finke, J., Furniss, A., McEnery, J. E., Monzani, M. E., Orienti, M., Reyes, L. C., Rossetti, A., & Williams, D. A. Fermi Large Area Telescope observations of the active galaxy 4C +55.17: Steady, hard gamma-ray emission and its implications. United States. https://doi.org/10.1088/0004-637X/738/2/148
McConville, W., Ostorero, L., Moderski, R., Stawarz, Ł., Cheung, C. C., Ajello, M., Bouvier, A., Bregeon, J., Donato, D., Finke, J., Furniss, A., McEnery, J. E., Monzani, M. E., Orienti, M., Reyes, L. C., Rossetti, A., and Williams, D. A. Fri .
"Fermi Large Area Telescope observations of the active galaxy 4C +55.17: Steady, hard gamma-ray emission and its implications". United States. https://doi.org/10.1088/0004-637X/738/2/148. https://www.osti.gov/servlets/purl/1357198.
@article{osti_1357198,
title = {Fermi Large Area Telescope observations of the active galaxy 4C +55.17: Steady, hard gamma-ray emission and its implications},
author = {McConville, W. and Ostorero, L. and Moderski, R. and Stawarz, Ł. and Cheung, C. C. and Ajello, M. and Bouvier, A. and Bregeon, J. and Donato, D. and Finke, J. and Furniss, A. and McEnery, J. E. and Monzani, M. E. and Orienti, M. and Reyes, L. C. and Rossetti, A. and Williams, D. A.},
abstractNote = {Here, we report Fermi Large Area Telescope (LAT) observations and broadband spectral modeling of the radio-loud active galaxy 4C +55.17 (z = 0.896), formally classified as a flat-spectrum radio quasar. Using 19 months of all-sky survey Fermi-LAT data, we detect a γ-ray continuum extending up to an observed energy of 145 GeV, and furthermore we find no evidence of γ-ray variability in the source over its observed history. We illustrate the implications of these results in two different domains. First, we investigate the origin of the steady γ-ray emission, where we re-examine the common classification of 4C +55.17 as a quasar-hosted blazar and consider instead its possible nature as a young radio source. We analyze and compare constraints on the source physical parameters in both blazar and young radio source scenarios by means of a detailed multiwavelength analysis and theoretical modeling of its broadband spectrum. Second, we show that the γ-ray spectrum may be formally extrapolated into the very high energy (VHE, ≥100 GeV) range at a flux level detectable by the current generation of ground-based Cherenkov telescopes. This enables us to place constraints on models of extragalactic background light within LAT energies and features the source as a promising candidate for VHE studies of the universe at an unprecedented redshift of z = 0.896.},
doi = {10.1088/0004-637X/738/2/148},
journal = {The Astrophysical Journal},
number = 2,
volume = 738,
place = {United States},
year = {Fri Aug 19 00:00:00 EDT 2011},
month = {Fri Aug 19 00:00:00 EDT 2011}
}
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Works referenced in this record:
FERMI /LARGE AREA TELESCOPE BRIGHT GAMMA-RAY SOURCE LIST
journal, June 2009
- Abdo, A. A.; Ackermann, M.; Ajello, M.
- The Astrophysical Journal Supplement Series, Vol. 183, Issue 1
BRIGHT ACTIVE GALACTIC NUCLEI SOURCE LIST FROM THE FIRST THREE MONTHS OF THE FERMI LARGE AREA TELESCOPE ALL-SKY SURVEY
journal, July 2009
- Abdo, A. A.; Ackermann, M.; Ajello, M.
- The Astrophysical Journal, Vol. 700, Issue 1
FERMI LARGE AREA TELESCOPE FIRST SOURCE CATALOG
journal, May 2010
- Abdo, A. A.; Ackermann, M.; Ajello, M.
- The Astrophysical Journal Supplement Series, Vol. 188, Issue 2
THE FIRST CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE
journal, April 2010
- Abdo, A. A.; Ackermann, M.; Ajello, M.
- The Astrophysical Journal, Vol. 715, Issue 1
FERMI LARGE AREA TELESCOPE CONSTRAINTS ON THE GAMMA-RAY OPACITY OF THE UNIVERSE
journal, October 2010
- Abdo, A. A.; Ackermann, M.; Ajello, M.
- The Astrophysical Journal, Vol. 723, Issue 2
The Sixth Data Release of the Sloan Digital Sky Survey
journal, April 2008
- Adelman‐McCarthy, Jennifer K.; Agüeros, Marcel A.; Allam, Sahar S.
- The Astrophysical Journal Supplement Series, Vol. 175, Issue 2
A low level of extragalactic background light as revealed by γ-rays from blazars
journal, April 2006
- Aharonian, F.; Akhperjanian, A. G.; Bazer-Bachi, A. R.
- Nature, Vol. 440, Issue 7087
THE EVOLUTION OF SWIFT /BAT BLAZARS AND THE ORIGIN OF THE MeV BACKGROUND
journal, June 2009
- Ajello, M.; Costamante, L.; Sambruna, R. M.
- The Astrophysical Journal, Vol. 699, Issue 1
The Swift BAT X‐Ray Survey. III. X‐Ray Spectra and Statistical Properties
journal, January 2008
- Ajello, M.; Rau, A.; Greiner, J.
- The Astrophysical Journal, Vol. 673, Issue 1
Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?
journal, June 2008
- Albert, J.; Aliu, E.; Anderhub, H.
- Science, Vol. 320, Issue 5884
Magic Discovery of very high Energy Emission from the fsrq pks 1222+21
journal, February 2011
- Aleksić, J.; Antonelli, L. A.; Antoranz, P.
- The Astrophysical Journal, Vol. 730, Issue 1
THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION
journal, May 2009
- Atwood, W. B.; Abdo, A. A.; Ackermann, M.
- The Astrophysical Journal, Vol. 697, Issue 2
Flat-spectrum symmetric objects with ∼1 kpc sizes – I. The candidates
journal, April 2006
- Augusto, Pedro; Gonzalez-Serrano, J. Ignacio; Perez-Fournon, Ismael
- Monthly Notices of the Royal Astronomical Society, Vol. 368, Issue 3
Unification of the Radio and Optical Properties of Gigahertz Peak Spectrum and Compact Steep‐Spectrum Radio Sources
journal, August 1997
- Bicknell, Geoffrey V.; Dopita, Michael A.; O'Dea, Christopher P. O.
- The Astrophysical Journal, Vol. 485, Issue 1
Radio, millimeter-submillimeter, and infrared spectra of flat-spectrum extragalactic radio sources
journal, August 1994
- Bloom, Steven D.; Marscher, Alan P.; Gear, Walter K.
- The Astronomical Journal, Vol. 108
The MAGIC-II gamma-ray stereoscopic telescope system
journal, November 2010
- Tridon, D. Borla; Schweizer, T.; Goebel, F.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 623, Issue 1
On the Depolarization of Discrete Radio Sources by Faraday Dispersion
journal, July 1966
- Burn, B. J.
- Monthly Notices of the Royal Astronomical Society, Vol. 133, Issue 1
The Swift X-Ray Telescope
journal, October 2005
- Burrows, David N.; Hill, J. E.; Nousek, J. A.
- Space Science Reviews, Vol. 120, Issue 3-4
The relationship between infrared, optical, and ultraviolet extinction
journal, October 1989
- Cardelli, Jason A.; Clayton, Geoffrey C.; Mathis, John S.
- The Astrophysical Journal, Vol. 345
A revised catalogue of EGRET ${\sf \gamma}$-ray sources
journal, July 2008
- Casandjian, J. -M.; Grenier, I. A.
- Astronomy & Astrophysics, Vol. 489, Issue 2
Jets and accretion processes in active galactic nuclei: further clues
journal, April 1997
- Celotti, A.; Padovani, P.; Ghisellini, G.
- Monthly Notices of the Royal Astronomical Society, Vol. 286, Issue 2
Spectral Irradiance Calibration in the Infrared. XIV. The Absolute Calibration of 2MASS
journal, August 2003
- Cohen, Martin; Wheaton, Wm. A.; Megeath, S. T.
- The Astronomical Journal, Vol. 126, Issue 2
Characteristic Ultraviolet/Optical Timescales in Active Galactic Nuclei
journal, July 2001
- Collier, Stefan; Peterson, Bradley M.
- The Astrophysical Journal, Vol. 555, Issue 2
On the Soft X‐Ray Spectra of γ‐Loud Blazars
journal, May 1997
- Comastri, Andrea; Fossati, Giovanni; Ghisellini, Gabriele
- The Astrophysical Journal, Vol. 480, Issue 2
Accretion disk Model of Short-Timescale Intermittent Activity in Young Radio Sources
journal, May 2009
- Czerny, Bożena; Siemiginowska, Aneta; Janiuk, Agnieszka
- The Astrophysical Journal, Vol. 698, Issue 1
The evolution of compact steep spectrum sources
journal, January 1993
- de Young, David S.
- The Astrophysical Journal, Vol. 402
Jet Interaction and the Evolution of Compact Symmetric Radio Sources
journal, November 1997
- De Young, David S.
- The Astrophysical Journal, Vol. 490, Issue 1
Simultaneous Constraints on the Spectrum of the Extragalactic Background Light and the Intrinsic TeV Spectra of Markarian 421, Markarian 501, and H1426+428
journal, January 2005
- Dwek, Eli; Krennrich, Frank
- The Astrophysical Journal, Vol. 618, Issue 2
The Second Extension of the International Celestial Reference Frame: ICRF-EXT.1
journal, June 2004
- Fey, A. L.; Ma, C.; Arias, E. F.
- The Astronomical Journal, Vol. 127, Issue 6
Modeling the Extragalactic Background Light from Stars and dust
journal, February 2010
- Finke, Justin D.; Razzaque, Soebur; Dermer, Charles D.
- The Astrophysical Journal, Vol. 712, Issue 1
Extragalactic optical-infrared background radiation, its time evolution and the cosmic photon-photon opacity
journal, June 2008
- Franceschini, A.; Rodighiero, G.; Vaccari, M.
- Astronomy & Astrophysics, Vol. 487, Issue 3
A high signal-to-noise ratio composite quasar spectrum
journal, May 1991
- Francis, Paul J.; Hewett, Paul C.; Foltz, Craig B.
- The Astrophysical Journal, Vol. 373
Fueling the central engine of radio galaxies: I. The molecular/dusty disk of 4C 31.04
journal, May 2007
- García-Burillo, S.; Combes, F.; Neri, R.
- Astronomy & Astrophysics, Vol. 468, Issue 3
The Swift Gamma‐Ray Burst Mission
journal, August 2004
- Gehrels, N.; Chincarini, G.; Giommi, P.
- The Astrophysical Journal, Vol. 611, Issue 2
A METHOD FOR SETTING UPPER LIMITS TO THE EXTRAGALACTIC BACKGROUND LIGHT WITH FERMI -LAT AND TeV OBSERVATIONS OF BLAZARS
journal, April 2010
- Georganopoulos, Markos; Finke, Justin D.; Reyes, Luis C.
- The Astrophysical Journal, Vol. 714, Issue 1
GeV gamma-ray attenuation and the high-redshift UV background
journal, November 2009
- Gilmore, Rudy C.; Madau, Piero; Primack, Joel R.
- Monthly Notices of the Royal Astronomical Society, Vol. 399, Issue 4
Polarimetry of Compact Symmetric Objects
journal, May 2007
- Gugliucci, N. E.; Taylor, G. B.; Peck, A. B.
- The Astrophysical Journal, Vol. 661, Issue 1
The Third EGRET Catalog of High‐Energy Gamma‐Ray Sources
journal, July 1999
- Hartman, R. C.; Bertsch, D. L.; Bloom, S. D.
- The Astrophysical Journal Supplement Series, Vol. 123, Issue 1
The Cosmic Infrared Background: Measurements and Implications
journal, September 2001
- Hauser, Michael G.; Dwek, Eli
- Annual Review of Astronomy and Astrophysics, Vol. 39, Issue 1
The VLBA Imaging and Polarimetry Survey at 5 GHz
journal, March 2007
- Helmboldt, J. F.; Taylor, G. B.; Tremblay, S.
- The Astrophysical Journal, Vol. 658, Issue 1
Relation Between Millimeter Wavelengths Emission and High-Energy Emission for Active Galactic Nuclei
journal, November 1998
- Huang, Li-hua; Jiang, Dong-rong; Cao, Xin-wu
- Chinese Physics Letters, Vol. 15, Issue 11
A survey of polarization in the JVAS/CLASS flat-spectrum radio source surveys - I. The data and catalogue production
journal, March 2007
- Jackson, N.; Battye, R. A.; Browne, I. W. A.
- Monthly Notices of the Royal Astronomical Society, Vol. 376, Issue 1
Observations of flat-spectrum radio sources at λ850âμm from the James Clerk Maxwell Telescope II. April 2000 to June 2005
journal, January 2010
- Jenness, T.; Robson, E. I.; Stevens, J. A.
- Monthly Notices of the Royal Astronomical Society, Vol. 401, Issue 2
Multiwavelength Observations of the Powerful Gamma‐Ray Quasar PKS 1510−089: Clues on the Jet Composition
journal, January 2008
- Kataoka, J.; Madejski, G.; Sikora, M.
- The Astrophysical Journal, Vol. 672, Issue 2
On the dynamical evolution of hotspots in powerful radio-loud active galactic nuclei: Dynamical evolution of hotspots in AGNs
journal, June 2006
- Kawakatu, N.; Kino, M.
- Monthly Notices of the Royal Astronomical Society, Vol. 370, Issue 3
Mini-radio lobes in AGN core illumination and their hadronic gamma-ray afterlight: Hadronic gamma-ray emission from young radio lobes
journal, December 2010
- Kino, Motoki; Asano, Katsuaki
- Monthly Notices of the Royal Astronomical Society: Letters, Vol. 412, Issue 1
New prediction of extragalactic GeV γ-ray emission from radio lobes of young AGN jets
journal, May 2009
- Kino, M.; Ito, H.; Kawakatu, N.
- Monthly Notices of the Royal Astronomical Society: Letters, Vol. 395, Issue 1
Extragalactic MeV γ-ray emission from cocoons of young radio galaxies
journal, March 2007
- Kino, M.; Kawakatu, N.; Ito, H.
- Monthly Notices of the Royal Astronomical Society, Vol. 376, Issue 4
Implications of cosmological gamma-ray absorption: II. Modification of gamma-ray spectra
journal, January 2004
- Kneiske, T. M.; Bretz, T.; Mannheim, K.
- Astronomy & Astrophysics, Vol. 413, Issue 3
The Relation Between agn Gamma-Ray Emission and Parsec-Scale Radio jets
journal, April 2009
- Kovalev, Y. Y.; Aller, H. D.; Aller, M. F.
- The Astrophysical Journal, Vol. 696, Issue 1
Seven-frequency VLBI Observations of the GHz-Peaked-Spectrum Source OQ 208
journal, October 2007
- Luo, Wen-Feng; Yang, Jun; Cui, Lang
- Chinese Journal of Astronomy and Astrophysics, Vol. 7, Issue 5
High‐Frequency VLBA Total and Polarized Intensity Images of Gamma‐Ray Bright Blazars
journal, September 2002
- Marscher, Alan P.; Jorstad, Svetlana G.; Mattox, John R.
- The Astrophysical Journal, Vol. 577, Issue 1
The Likelihood Analysis of EGRET Data
journal, April 1996
- Mattox, J. R.; Bertsch, D. L.; Chiang, J.
- The Astrophysical Journal, Vol. 461
A Quantitative Evaluation of Potential Radio Identifications for 3EG EGRET Sources
journal, August 2001
- Mattox, J. R.; Hartman, R. C.; Reimer, O.
- The Astrophysical Journal Supplement Series, Vol. 135, Issue 2
Numerical simulations of radiation from blazar jets
journal, August 2003
- Moderski, R.; Sikora, M.; Błażejowski, M.
- Astronomy & Astrophysics, Vol. 406, Issue 3
Klein-Nishina effects in the spectra of non-thermal sources immersed in external radiation fields
journal, November 2005
- Moderski, Rafał; Sikora, Marek; Coppi, Paolo S.
- Monthly Notices of the Royal Astronomical Society, Vol. 363, Issue 3
The Cosmic Lens All-Sky Survey - I. Source selection and observations
journal, May 2003
- Myers, S. T.; Jackson, N. J.; Browne, I. W. A.
- Monthly Notices of the Royal Astronomical Society, Vol. 341, Issue 1
High Galactic latitude Fermi sources of γ -rays with energies above 100 GeV
journal, April 2011
- Neronov, A.; Semikoz, D.; Vovk, Ie.
- Astronomy & Astrophysics, Vol. 529
The Compact Steep‐Spectrum and Gigahertz Peaked‐Spectrum Radio Sources
journal, May 1998
- O'Dea, Christopher P.
- Publications of the Astronomical Society of the Pacific, Vol. 110, Issue 747
Constraints on Radio Source Evolution from the Compact Steep Spectrum and GHz Peaked Spectrum Radio Sources
journal, January 1997
- O'Dea, Christopher P.; Baum, Stefi A.
- The Astronomical Journal, Vol. 113
Are young radio sources in equipartition?
journal, July 2008
- Orienti, M.; Dallacasa, D.
- Astronomy & Astrophysics, Vol. 487, Issue 3
Obscuration of the Parsec‐Scale Jets in the Compact Symmetric Object 1946+708
journal, August 1999
- Peck, A. B.; Taylor, G. B.; Conway, J. E.
- The Astrophysical Journal, Vol. 521, Issue 1
Physical Parameters in the Hot Spots and Jets of Compact Symmetric Objects
journal, April 2002
- Perucho, M.; Marti, J. M.
- The Astrophysical Journal, Vol. 568, Issue 2
Observational Gamma-ray Cosmology
conference, January 2005
- Primack, Joel R.
- HIGH ENERGY GAMMA-RAY ASTRONOMY: 2nd International Symposium on High Energy Gamma-Ray Astronomy, AIP Conference Proceedings
The Statistics and Ages of Compact Symmetric Objects
journal, April 1996
- Readhead, A. C. S.; Taylor, G. B.; Xu, W.
- The Astrophysical Journal, Vol. 460
Flux density monitoring of radio sources
with detected or supposed γ -ray emission
journal, July 1998
- Reich, W.; Reich, P.; Pohl, M.
- Astronomy and Astrophysics Supplement Series, Vol. 131, Issue 1
Intermittent Radio Galaxies and Source Statistics
journal, October 1997
- Reynolds, Christopher S.; Begelman, Mitchell C.
- The Astrophysical Journal, Vol. 487, Issue 2
The interstellar extinction law from 1 to 13 microns
journal, January 1985
- Rieke, G. H.; Lebofsky, M. J.
- The Astrophysical Journal, Vol. 288
The Swift Ultra-Violet/Optical Telescope
journal, October 2005
- Roming, Peter W. A.; Kennedy, Thomas E.; Mason, Keith O.
- Space Science Reviews, Vol. 120, Issue 3-4
Multi-frequency VLBA observations of compact sources from the Peacock and Wall catalogue
journal, April 2005
- Rossetti, A.; Mantovani, F.; Dallacasa, D.
- Astronomy & Astrophysics, Vol. 434, Issue 2
Absorption of High‐Energy Gamma Rays by Interactions with Extragalactic Starlight Photons at High Redshifts and the High‐Energy Gamma‐Ray Background
journal, February 1998
- Salamon, M. H.; Stecker, F. W.
- The Astrophysical Journal, Vol. 493, Issue 2
Maps of Dust Infrared Emission for Use in Estimation of Reddening and Cosmic Microwave Background Radiation Foregrounds
journal, June 1998
- Schlegel, David J.; Finkbeiner, Douglas P.; Davis, Marc
- The Astrophysical Journal, Vol. 500, Issue 2
The Sloan Digital Sky Survey Quasar Catalog. IV. Fifth Data Release
journal, May 2007
- Schneider, Donald P.; Hall, Patrick B.; Richards, Gordon T.
- The Astronomical Journal, Vol. 134, Issue 1
10.8-GHz flux density variations among a complete sample of sources from the NRAO-Bonn 84 survey
journal, January 1983
- Seielstad, G. A.; Pearson, T. J.; Readhead, A. C. S.
- Publications of the Astronomical Society of the Pacific, Vol. 95
X-ray emission from GPS and CSS sources
journal, February 2009
- Siemiginowska, A.
- Astronomische Nachrichten, Vol. 330, Issue 2-3
X‐Ray Cluster Associated with the z = 1.063 CSS Quasar 3C 186: The Jet is Not Frustrated
journal, October 2005
- Siemiginowska, Aneta; Cheung, C. C.; LaMassa, Stephanie
- The Astrophysical Journal, Vol. 632, Issue 1
X‐Ray Properties of the Gigahertz Peaked and Compact Steep Spectrum Sources
journal, September 2008
- Siemiginowska, Aneta; LaMassa, Stephanie; Aldcroft, Thomas L.
- The Astrophysical Journal, Vol. 684, Issue 2
The 300 kpc Long X‐Ray Jet in PKS 1127−145, z = 1.18 Quasar: Constraining X‐Ray Emission Models
journal, March 2007
- Siemiginowska, Aneta; Stawarz, Łukasz; Cheung, C. C.
- The Astrophysical Journal, Vol. 657, Issue 1
Comptonization of diffuse ambient radiation by a relativistic jet: The source of gamma rays from blazars?
journal, January 1994
- Sikora, Marek; Begelman, Mitchell C.; Rees, Martin J.
- The Astrophysical Journal, Vol. 421
3C 454.3 Reveals the Structure and Physics of Its “Blazar Zone”
journal, March 2008
- Sikora, Marek; Moderski, RafaŁ; Madejski, Greg M.
- The Astrophysical Journal, Vol. 675, Issue 1
On the evolution of young radio-loud AGN
journal, December 2000
- Snellen, I. A. G.; Schilizzi, R. T.; Miley, G. K.
- Monthly Notices of the Royal Astronomical Society, Vol. 319, Issue 2
Evolution of and High‐Energy Emission from GHz‐Peaked Spectrum Sources
journal, June 2008
- Stawarz, Ł.; Ostorero, L.; Begelman, M. C.
- The Astrophysical Journal, Vol. 680, Issue 2
Intergalactic Photon Spectra from the Far‐IR to the UV Lyman Limit for 0 < z < 6 and the Optical Depth of the Universe to High‐Energy Gamma Rays
journal, September 2006
- Stecker, F. W.; Malkan, M. A.; Scully, S. T.
- The Astrophysical Journal, Vol. 648, Issue 2
FERMI LARGE AREA TELESCOPE DETECTION OF BRIGHT γ-RAY OUTBURSTS FROM THE PECULIAR QUASAR 4C +21.35
journal, April 2011
- Tanaka, Y. T.; Stawarz, Ł.; Thompson, D. J.
- The Astrophysical Journal, Vol. 733, Issue 1
Chandra and Hubble Space Telescope Observations of Gamma‐Ray Blazars: Comparing Jet Emission at Small and Large Scales
journal, June 2007
- Tavecchio, F.; Maraschi, L.; Wolter, A.
- The Astrophysical Journal, Vol. 662, Issue 2
Characteristics of EGRET Blazars in the VLBA Imaging and Polarimetry Survey (VIPS)
journal, December 2007
- Taylor, G. B.; Healey, S. E.; Helmboldt, J. F.
- The Astrophysical Journal, Vol. 671, Issue 2
Twenty years monitoring of extragalactic sources at 22, 37 and 87 GHz
journal, October 2004
- Teräsranta, H.; Achren, J.; Hanski, M.
- Astronomy & Astrophysics, Vol. 427, Issue 2
Fifteen years monitoring of extragalactic radio sources at 22, 37 and 87 GHz
journal, November 1998
- Teräsranta, H.; Tornikoski, M.; Mujunen, A.
- Astronomy and Astrophysics Supplement Series, Vol. 132, Issue 3
24 year monitoring of extragalactic sources at 22 and 37 GHz
journal, August 2005
- Teräsranta, H.; Wiren, S.; Koivisto, P.
- Astronomy & Astrophysics, Vol. 440, Issue 1
Radio continuum spectra of gigahertz-peaked spectrum galaxies
journal, April 2007
- Torniainen, I.; Tornikoski, M.; Lähteenmäki, A.
- Astronomy & Astrophysics, Vol. 469, Issue 2
Unified Schemes for Radio-Loud Active Galactic Nuclei
journal, June 1995
- Urry, C. Megan; Padovani, Paolo
- Publications of the Astronomical Society of the Pacific, Vol. 107
Studies of kiloparsec-scale, steep-spectrum radio cores. I VLA maps
journal, January 1984
- van Breugel, W.; Miley, G.; Heckman, T.
- The Astronomical Journal, Vol. 89
A catalogue of quasars and active nuclei: 12th edition
journal, August 2006
- Véron-Cetty, M. -P.; Véron, P.
- Astronomy & Astrophysics, Vol. 455, Issue 2
Variability of extragalactic sources at 2.7 GHz. IV Evidence for weak extended emission and for rapid variability
journal, June 1981
- Wardle, J. F. C.; Bridle, A. H.; Kesteven, M. J. L.
- The Astronomical Journal, Vol. 86
Two-sided ejection in powerful radio sources: The compact symmetric objects
journal, September 1994
- Wilkinson, P. N.; Polatidis, A. G.; Readhead, A. C. S.
- The Astrophysical Journal, Vol. 432
Hubble Space Telescope Sample of Radio-loud Quasars: Ultraviolet Spectra of the First 31 Quasars
journal, July 1995
- Wills, Beverley J.; Thompson, Keith L.; Han, Mingsheng
- The Astrophysical Journal, Vol. 447
FIVE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE OBSERVATIONS: SOURCE CATALOG
journal, February 2009
- Wright, E. L.; Chen, X.; Odegard, N.
- The Astrophysical Journal Supplement Series, Vol. 180, Issue 2
Works referencing / citing this record:
Identification of activity peaks in time-tagged data with a scan-statistics driven clustering method and its application to gamma-ray data samples
journal, July 2018
- Pacciani, Luigi
- Astronomy & Astrophysics, Vol. 615
Mojave. x. Parsec-Scale jet Orientation Variations and Superluminal Motion in Active Galactic Nuclei
journal, October 2013
- Lister, M. L.; Aller, M. F.; Aller, H. D.
- The Astronomical Journal, Vol. 146, Issue 5
Search for very high energy gamma-rays from the z = 0.896 quasar 4C +55.17 with the MAGIC telescopes
journal, March 2014
- Aleksi , J.; Ansoldi, S.; Antonelli, L. A.
- Monthly Notices of the Royal Astronomical Society, Vol. 440, Issue 1
Leptonic and Hadronic Modeling of Fermi -LAT Hard Spectrum Quasars and Predictions for High-energy Polarization
journal, August 2018
- Paliya, Vaidehi S.; Zhang, Haocheng; Böttcher, Markus
- The Astrophysical Journal, Vol. 863, Issue 1
FIRST DETECTION IN GAMMA-RAYS OF A YOUNG RADIO GALAXY: FERMI -LAT OBSERVATIONS OF THE COMPACT SYMMETRIC OBJECT PKS 1718−649
journal, April 2016
- Migliori, G.; Siemiginowska, A.; Sobolewska, M.
- The Astrophysical Journal, Vol. 821, Issue 2
Search for very high energy gamma-rays from the z = 0.896 quasar 4C +55.17 with the MAGIC telescopes
text, January 2014
- Aleksić, J.; Ansoldi, S.; Antonelli, L. A.
- Deutsches Elektronen-Synchrotron, DESY, Hamburg
Gamma-Ray and Parsec-Scale Jet Properties of a Complete Sample of Blazars From the MOJAVE Program
text, January 2011
- Lister, M. L.; Aller, M.; Aller, H.
- arXiv
Identification of activity peaks in time-tagged data with a scan-statistics driven clustering method and its application to gamma-ray data samples
text, January 2018
- Pacciani, Luigi
- arXiv