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Title: VERITAS Observations of Six Bright, Hard-Spectrum Fermi-LAT Blazars

Abstract

In this paper, we report on VERITAS very high energy (VHE; E ≥ 100 GeV) observations of six blazars selected from the Fermi Large Area Telescope First Source Catalog (1FGL). The gamma-ray emission from 1FGL sources was extrapolated up to the VHE band, taking gamma-ray absorption by the extragalactic background light into account. This allowed the selection of six bright, hard-spectrum blazars that were good candidate TeV emitters. Spectroscopic redshift measurements were attempted with the Keck Telescope for the targets without Sloan Digital Sky Survey spectroscopic data. No VHE emission is detected during the observations of the six sources described here. Corresponding TeV upper limits are presented, along with contemporaneous Fermi observations and non-concurrent Swift UVOT and X-Ray Telescope data. The blazar broadband spectral energy distributions (SEDs) are assembled and modeled with a single-zone synchrotron self-Compton model. Finally, the SED built for each of the six blazars shows a synchrotron peak bordering between the intermediate- and high-spectrum-peak classifications, with four of the six resulting in particle-dominated emission regions.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); Smithsonian Institution (United States); Natural Sciences and Engineering Research Council of Canada (NSERC); Science Foundation Ireland (SFI) (Ireland); Science and Technology Facilities Council (STFC) (United Kingdom)
Contributing Org.:
The VERITAS Collaboration; Fermi-LAT Collaboration
OSTI Identifier:
1356665
Grant/Contract Number:  
SFI 10/RFP/AST2748
Resource Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 759; 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; BL Lacertae objects; gamma rays

Citation Formats

Aliu, E., Archambault, S., Arlen, T., Aune, T., Beilicke, M., Benbow, W., Böttcher, M., Bouvier, A., Buckley, J. H., Bugaev, V., Cesarini, A., Ciupik, L., Collins-Hughes, E., Connolly, M. P., Cui, W., Dickherber, R., Duke, C., Dumm, J., Errando, M., Falcone, A., Federici, S., Feng, Q., Finley, J. P., Finnegan, G., Fortson, L., Furniss, A., Galante, N., Gall, D., Godambe, S., Griffin, S., Grube, J., Gyuk, G., Hanna, D., Holder, J., Huan, H., Kaaret, P., Karlsson, N., Khassen, Y., Kieda, D., Krawczynski, H., Krennrich, F., Lee, K., Madhavan, A. S., Maier, G., Majumdar, P., McArthur, S., McCann, A., Moriarty, P., Mukherjee, R., Nelson, T., de Bhróithe, A. O’Faoláin, Ong, R. A., Orr, M., Otte, A. N., Park, N., Perkins, J. S., Pichel, A., Pohl, M., Prokoph, H., Quinn, J., Ragan, K., Reyes, L. C., Reynolds, P. T., Roache, E., Saxon, D. B., Sembroski, G. H., Staszak, D., Telezhinsky, I., Tešić, G., Theiling, M., Thibadeau, S., Tsurusaki, K., Varlotta, A., Vassiliev, V. V., Vincent, S., Vivier, M., Wakely, S. P., Weekes, T. C., Weinstein, A., Welsing, R., Williams, D. A., Zitzer, B., Fortin, P., Horan, D., Fumagalli, M., Kaplan, K., and Prochaska, J. X. VERITAS Observations of Six Bright, Hard-Spectrum Fermi-LAT Blazars. United States: N. p., 2012. Web. doi:10.1088/0004-637X/759/2/102.
Aliu, E., Archambault, S., Arlen, T., Aune, T., Beilicke, M., Benbow, W., Böttcher, M., Bouvier, A., Buckley, J. H., Bugaev, V., Cesarini, A., Ciupik, L., Collins-Hughes, E., Connolly, M. P., Cui, W., Dickherber, R., Duke, C., Dumm, J., Errando, M., Falcone, A., Federici, S., Feng, Q., Finley, J. P., Finnegan, G., Fortson, L., Furniss, A., Galante, N., Gall, D., Godambe, S., Griffin, S., Grube, J., Gyuk, G., Hanna, D., Holder, J., Huan, H., Kaaret, P., Karlsson, N., Khassen, Y., Kieda, D., Krawczynski, H., Krennrich, F., Lee, K., Madhavan, A. S., Maier, G., Majumdar, P., McArthur, S., McCann, A., Moriarty, P., Mukherjee, R., Nelson, T., de Bhróithe, A. O’Faoláin, Ong, R. A., Orr, M., Otte, A. N., Park, N., Perkins, J. S., Pichel, A., Pohl, M., Prokoph, H., Quinn, J., Ragan, K., Reyes, L. C., Reynolds, P. T., Roache, E., Saxon, D. B., Sembroski, G. H., Staszak, D., Telezhinsky, I., Tešić, G., Theiling, M., Thibadeau, S., Tsurusaki, K., Varlotta, A., Vassiliev, V. V., Vincent, S., Vivier, M., Wakely, S. P., Weekes, T. C., Weinstein, A., Welsing, R., Williams, D. A., Zitzer, B., Fortin, P., Horan, D., Fumagalli, M., Kaplan, K., & Prochaska, J. X. VERITAS Observations of Six Bright, Hard-Spectrum Fermi-LAT Blazars. United States. doi:10.1088/0004-637X/759/2/102.
Aliu, E., Archambault, S., Arlen, T., Aune, T., Beilicke, M., Benbow, W., Böttcher, M., Bouvier, A., Buckley, J. H., Bugaev, V., Cesarini, A., Ciupik, L., Collins-Hughes, E., Connolly, M. P., Cui, W., Dickherber, R., Duke, C., Dumm, J., Errando, M., Falcone, A., Federici, S., Feng, Q., Finley, J. P., Finnegan, G., Fortson, L., Furniss, A., Galante, N., Gall, D., Godambe, S., Griffin, S., Grube, J., Gyuk, G., Hanna, D., Holder, J., Huan, H., Kaaret, P., Karlsson, N., Khassen, Y., Kieda, D., Krawczynski, H., Krennrich, F., Lee, K., Madhavan, A. S., Maier, G., Majumdar, P., McArthur, S., McCann, A., Moriarty, P., Mukherjee, R., Nelson, T., de Bhróithe, A. O’Faoláin, Ong, R. A., Orr, M., Otte, A. N., Park, N., Perkins, J. S., Pichel, A., Pohl, M., Prokoph, H., Quinn, J., Ragan, K., Reyes, L. C., Reynolds, P. T., Roache, E., Saxon, D. B., Sembroski, G. H., Staszak, D., Telezhinsky, I., Tešić, G., Theiling, M., Thibadeau, S., Tsurusaki, K., Varlotta, A., Vassiliev, V. V., Vincent, S., Vivier, M., Wakely, S. P., Weekes, T. C., Weinstein, A., Welsing, R., Williams, D. A., Zitzer, B., Fortin, P., Horan, D., Fumagalli, M., Kaplan, K., and Prochaska, J. X. Thu . "VERITAS Observations of Six Bright, Hard-Spectrum Fermi-LAT Blazars". United States. doi:10.1088/0004-637X/759/2/102. https://www.osti.gov/servlets/purl/1356665.
@article{osti_1356665,
title = {VERITAS Observations of Six Bright, Hard-Spectrum Fermi-LAT Blazars},
author = {Aliu, E. and Archambault, S. and Arlen, T. and Aune, T. and Beilicke, M. and Benbow, W. and Böttcher, M. and Bouvier, A. and Buckley, J. H. and Bugaev, V. and Cesarini, A. and Ciupik, L. and Collins-Hughes, E. and Connolly, M. P. and Cui, W. and Dickherber, R. and Duke, C. and Dumm, J. and Errando, M. and Falcone, A. and Federici, S. and Feng, Q. and Finley, J. P. and Finnegan, G. and Fortson, L. and Furniss, A. and Galante, N. and Gall, D. and Godambe, S. and Griffin, S. and Grube, J. and Gyuk, G. and Hanna, D. and Holder, J. and Huan, H. and Kaaret, P. and Karlsson, N. and Khassen, Y. and Kieda, D. and Krawczynski, H. and Krennrich, F. and Lee, K. and Madhavan, A. S. and Maier, G. and Majumdar, P. and McArthur, S. and McCann, A. and Moriarty, P. and Mukherjee, R. and Nelson, T. and de Bhróithe, A. O’Faoláin and Ong, R. A. and Orr, M. and Otte, A. N. and Park, N. and Perkins, J. S. and Pichel, A. and Pohl, M. and Prokoph, H. and Quinn, J. and Ragan, K. and Reyes, L. C. and Reynolds, P. T. and Roache, E. and Saxon, D. B. and Sembroski, G. H. and Staszak, D. and Telezhinsky, I. and Tešić, G. and Theiling, M. and Thibadeau, S. and Tsurusaki, K. and Varlotta, A. and Vassiliev, V. V. and Vincent, S. and Vivier, M. and Wakely, S. P. and Weekes, T. C. and Weinstein, A. and Welsing, R. and Williams, D. A. and Zitzer, B. and Fortin, P. and Horan, D. and Fumagalli, M. and Kaplan, K. and Prochaska, J. X.},
abstractNote = {In this paper, we report on VERITAS very high energy (VHE; E ≥ 100 GeV) observations of six blazars selected from the Fermi Large Area Telescope First Source Catalog (1FGL). The gamma-ray emission from 1FGL sources was extrapolated up to the VHE band, taking gamma-ray absorption by the extragalactic background light into account. This allowed the selection of six bright, hard-spectrum blazars that were good candidate TeV emitters. Spectroscopic redshift measurements were attempted with the Keck Telescope for the targets without Sloan Digital Sky Survey spectroscopic data. No VHE emission is detected during the observations of the six sources described here. Corresponding TeV upper limits are presented, along with contemporaneous Fermi observations and non-concurrent Swift UVOT and X-Ray Telescope data. The blazar broadband spectral energy distributions (SEDs) are assembled and modeled with a single-zone synchrotron self-Compton model. Finally, the SED built for each of the six blazars shows a synchrotron peak bordering between the intermediate- and high-spectrum-peak classifications, with four of the six resulting in particle-dominated emission regions.},
doi = {10.1088/0004-637X/759/2/102},
journal = {Astrophysical Journal},
number = 2,
volume = 759,
place = {United States},
year = {2012},
month = {10}
}

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Works referenced in this record:

THE SPECTRAL ENERGY DISTRIBUTION OF FERMI BRIGHT BLAZARS
journal, May 2010


FERMI OBSERVATIONS OF GRB 090902B: A DISTINCT SPECTRAL COMPONENT IN THE PROMPT AND DELAYED EMISSION
journal, November 2009


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
  • DOI: 10.1088/0067-0049/188/2/405

THE FIRST CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE
journal, April 2010


Multi-Wavelength Observations of the Flaring Gamma-Ray Blazar 3c 66a in 2008 October
journal, December 2010


VERITAS Observations of the γ‐Ray Binary LS I +61 303
journal, June 2008

  • Acciari, V. A.; Beilicke, M.; Blaylock, G.
  • The Astrophysical Journal, Vol. 679, Issue 2
  • DOI: 10.1086/587736

Veritas Observations of a very high Energy γ-Ray Flare from the Blazar 3c 66a
journal, February 2009


MULTIWAVELENGTH OBSERVATIONS OF A TeV-FLARE FROM W COMAE
journal, November 2009


Discovery of very high Energy Gamma rays from pks 1424+240 and Multiwavelength Constraints on its Redshift
journal, December 2009


VERITAS OBSERVATIONS OF GAMMA-RAY BURSTS DETECTED BY SWIFT
journal, November 2011


Discovery of High-Energy and very high Energy γ-Ray Emission from the Blazar rbs 0413
journal, April 2012


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
  • DOI: 10.1038/nature04680

Constraints on the extremely high-energy cosmic ray accelerators from classical electrodynamics
journal, July 2002


Discovery of Very High Energy γ-Ray Emission from the Low-Frequency-peaked BL Lacertae Object BL Lacertae
journal, August 2007

  • Albert, J.; Aliu, E.; Anderhub, H.
  • The Astrophysical Journal, Vol. 666, Issue 1
  • DOI: 10.1086/521550

VHE γ‐Ray Observation of the Crab Nebula and its Pulsar with the MAGIC Telescope
journal, February 2008

  • Albert, J.; Aliu, E.; Anderhub, H.
  • The Astrophysical Journal, Vol. 674, Issue 2
  • DOI: 10.1086/525270

Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?
journal, June 2008


Identification of a Complete Sample of Northern ROSAT All‐Sky Survey X‐Ray Sources. III. The Catalog
journal, August 1998

  • Appenzeller, I.; Thiering, I.; Zickgraf, F. ‐J.
  • The Astrophysical Journal Supplement Series, Vol. 117, Issue 2
  • DOI: 10.1086/313125

THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION
journal, May 2009


RBSC‐NVSS Sample. I. Radio and Optical Identifications of a Complete Sample of 1556 Bright X‐Ray Sources
journal, August 2000

  • Bauer, Franz E.; Condon, J. J.; Thuan, Trinh X.
  • The Astrophysical Journal Supplement Series, Vol. 129, Issue 2
  • DOI: 10.1086/313425

A new catalog of 53,522 4.85 GHz sources
journal, January 1991

  • Becker, Robert H.; White, Richard L.; Edwards, Alan L.
  • The Astrophysical Journal Supplement Series, Vol. 75
  • DOI: 10.1086/191529

On the gamma-ray emission from 3C 279
journal, January 1993

  • Bednarek, W.
  • The Astrophysical Journal, Vol. 402
  • DOI: 10.1086/186692

Background modelling in very-high-energy γ -ray astronomy
journal, April 2007


Intermediate BL Lac objects
journal, August 2001


Modeling the emission processes in blazars
journal, April 2007


X‐Ray Spectral Variability Signatures of Flares in BL Lacertae Objects
journal, December 2002

  • Bottcher, Markus; Chiang, James
  • The Astrophysical Journal, Vol. 581, Issue 1
  • DOI: 10.1086/344155

The Swift X-Ray Telescope
journal, October 2005


Parameter estimation in astronomy through application of the likelihood ratio
journal, March 1979


TeV candidate BL Lac objects
journal, March 2002


Hadronic Production of [CLC]TeV[/CLC] Gamma-Ray Flares from Blazars
journal, March 1997

  • Dar, Arnon; Laor, Ari
  • The Astrophysical Journal, Vol. 478, Issue 1
  • DOI: 10.1086/310544

Extragalactic background light inferred from AEGIS galaxy-SED-type fractions: EBL from AEGIS galaxy-SED-type fractions
journal, October 2010


On weak Redshift Dependence of Gamma-Ray Spectra of Distant Blazars
journal, May 2012


Modeling the Extragalactic Background Light from Stars and dust
journal, February 2010


The ROSAT Bright Survey: I. Identification of an AGN sample with hard ROSAT X-ray spectra
journal, January 1998

  • Fischer, J. -U.; Hasinger, G.; Schwope, A. D.
  • Astronomische Nachrichten: News in Astronomy and Astrophysics, Vol. 319, Issue 6
  • DOI: 10.1002/asna.2123190603

Correcting for the Effects of Interstellar Extinction
journal, January 1999

  • Fitzpatrick, Edward L.
  • Publications of the Astronomical Society of the Pacific, Vol. 111, Issue 755
  • DOI: 10.1086/316293

New methods of atmospheric Cherenkov imaging for gamma-ray astronomy. I. The false source method
journal, May 1994


A unifying view of the spectral energy distributions of blazars
journal, September 1998


Extragalactic optical-infrared background radiation, its time evolution and the cosmic photon-photon opacity
journal, June 2008


The Swift Gamma‐Ray Burst Mission
journal, August 2004

  • Gehrels, N.; Chincarini, G.; Giommi, P.
  • The Astrophysical Journal, Vol. 611, Issue 2
  • DOI: 10.1086/422091

The blazar sequence: a new perspective
journal, July 2008


GeV gamma-ray attenuation and the high-redshift UV background
journal, November 2009


Opacity of the Universe to High-Energy Photons
journal, March 1967


The Cosmic Infrared Background: Measurements and Implications
journal, September 2001


CGRaBS: An All‐Sky Survey of Gamma‐Ray Blazar Candidates
journal, March 2008

  • Healey, Stephen E.; Romani, Roger W.; Cotter, Garret
  • The Astrophysical Journal Supplement Series, Vol. 175, Issue 1
  • DOI: 10.1086/523302

The first VERITAS telescope
journal, July 2006


The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
journal, September 2005


Gamma–hadron separation methods for the VERITAS array of four imaging atmospheric Cherenkov telescopes
journal, July 2006


Radio‐loud Active Galaxies in the Northern ROSAT All‐Sky Survey. III. New Spectroscopic Identifications from the RASS–Green Bank BL Lacertae Survey
journal, September 1998

  • Laurent‐Muehleisen, S. A.; Kollgaard, R. I.; Ciardullo, R.
  • The Astrophysical Journal Supplement Series, Vol. 118, Issue 1
  • DOI: 10.1086/313134

The RGB Sample of Intermediate BL Lacertae Objects
journal, November 1999

  • Laurent‐Muehleisen, S. A.; Kollgaard, R. I.; Feigelson, E. D.
  • The Astrophysical Journal, Vol. 525, Issue 1
  • DOI: 10.1086/307881

Analysis methods for results in gamma-ray astronomy
journal, September 1983

  • Li, T. -P.; Ma, Y. -Q.
  • The Astrophysical Journal, Vol. 272
  • DOI: 10.1086/161295

A jet model for the gamma-ray emitting blazar 3C 279
journal, September 1992

  • Maraschi, L.; Ghisellini, G.; Celotti, A.
  • The Astrophysical Journal, Vol. 397
  • DOI: 10.1086/186531

The Likelihood Analysis of EGRET Data
journal, April 1996

  • Mattox, J. R.; Bertsch, D. L.; Chiang, J.
  • The Astrophysical Journal, Vol. 461
  • DOI: 10.1086/177068

Imaging Redshift Estimates for bl Lacertae Objects
journal, February 2010


From the Blazar Sequence to the Blazar Envelope: Revisiting the Relativistic jet Dichotomy in Radio-Loud Active Galactic Nuclei
journal, October 2011

  • Meyer, Eileen T.; Fossati, Giovanni; Georganopoulos, Markos
  • The Astrophysical Journal, Vol. 740, Issue 2
  • DOI: 10.1088/0004-637X/740/2/98

Optical identification of ROSAT-FSC sources
journal, March 2006


Modeling the April 1997 flare of Mkn 501
conference, January 2000

  • Mücke, A.
  • GeV-TeV gamma ray astrophysics workshop, AIP Conference Proceedings
  • DOI: 10.1063/1.1291360

Spectral energy distributions of a large sample of BL Lacertae objects
journal, December 2005


FERMI LARGE AREA TELESCOPE SECOND SOURCE CATALOG
journal, March 2012

  • Nolan, P. L.; Abdo, A. A.; Ackermann, M.
  • The Astrophysical Journal Supplement Series, Vol. 199, Issue 2
  • DOI: 10.1088/0067-0049/199/2/31

Strong new Constraints on the Extragalactic Background Light in the Near- to Mid-Infrared
journal, May 2011


The connection between x-ray- and radio-selected BL Lacertae objects
journal, May 1995

  • Padovani, Paolo; Giommi, Paolo
  • The Astrophysical Journal, Vol. 444
  • DOI: 10.1086/175631

Photometric calibration of the Swift ultraviolet/optical telescope: Photometric calibration of the Swift UVOT
journal, December 2007


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
  • DOI: 10.1063/1.1878394

Limits and confidence intervals in the presence of nuisance parameters
journal, October 2005

  • Rolke, Wolfgang A.; López, Angel M.; Conrad, Jan
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 551, Issue 2-3
  • DOI: 10.1016/j.nima.2005.05.068

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
  • DOI: 10.1086/305772

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
  • DOI: 10.1086/173633

New Upper Limits on Intergalactic Infrared Radiation from High-Energy Astrophysics
journal, September 1993

  • Stecker, F. W.; de Jager, O. C.
  • The Astrophysical Journal, Vol. 415
  • DOI: 10.1086/187035

TeV gamma rays from 3C 279 - A possible probe of origin and intergalactic infrared radiation fields
journal, May 1992

  • Stecker, F. W.; de Jager, O. C.; Salamon, M. H.
  • The Astrophysical Journal, Vol. 390
  • DOI: 10.1086/186369

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
  • DOI: 10.1086/506188

Calibration of the Energetic Gamma-Ray Experiment Telescope (EGRET) for the Compton Gamma-Ray Observatory
journal, May 1993

  • Thompson, D. J.; Bertsch, D. L.; Fichtel, C. E.
  • The Astrophysical Journal Supplement Series, Vol. 86
  • DOI: 10.1086/191793

ROXA : a new multi-frequency large sample of blazars selected with SDSS and 2dF optical spectroscopy
journal, June 2007


VERITAS: the Very Energetic Radiation Imaging Telescope Array System
journal, May 2002


    Works referencing / citing this record:

    BL LAC CANDIDATES FOR TeV OBSERVATIONS
    journal, July 2013

    • Massaro, F.; Paggi, A.; Errando, M.
    • The Astrophysical Journal Supplement Series, Vol. 207, Issue 1
    • DOI: 10.1088/0067-0049/207/1/16

    Multiwavelength follow-up of a rare IceCube neutrino multiplet
    journal, November 2017