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Title: VERITAS OBSERVATIONS OF SIX BRIGHT, HARD-SPECTRUM FERMI-LAT BLAZARS

Abstract

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. 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:
;  [1];  [2];  [3]; ;  [4]; ; ; ;  [5];  [6];  [7]; ;  [8];  [9];  [10];  [11];  [12];  [13];  [14] more »; ; « less
  1. Department of Physics and Astronomy, Barnard College, Columbia University, NY 10027 (United States)
  2. Physics Department, McGill University, Montreal, QC H3A 2T8 (Canada)
  3. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States)
  4. Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, CA 95064 (United States)
  5. Department of Physics, Washington University, St. Louis, MO 63130 (United States)
  6. Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645 (United States)
  7. Astrophysical Institute, Department of Physics and Astronomy, Ohio University, Athens, OH 45701 (United States)
  8. School of Physics, National University of Ireland Galway, University Road, Galway (Ireland)
  9. Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, IL 60605 (United States)
  10. School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland)
  11. Department of Physics, Purdue University, West Lafayette, IN 47907 (United States)
  12. Department of Physics, Grinnell College, Grinnell, IA 50112-1690 (United States)
  13. School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455 (United States)
  14. Department of Astronomy and Astrophysics, 525 Davey Lab, Pennsylvania State University, University Park, PA 16802 (United States)
Publication Date:
OSTI Identifier:
22086406
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 759; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; BL LACERTAE OBJECTS; EMISSION SPECTRA; ENERGY SPECTRA; GALAXIES; GAMMA ASTRONOMY; GAMMA RADIATION; GEV RANGE; PHOTON EMISSION; QUASARS; RED SHIFT; SYNCHROTRON RADIATION; TEV RANGE; VISIBLE RADIATION; X RADIATION

Citation Formats

Aliu, E., Errando, M., Archambault, S., Arlen, T., Aune, T., Bouvier, A., Beilicke, M., Buckley, J. H., Bugaev, V., Dickherber, R., Benbow, W., Boettcher, M., Cesarini, A., Connolly, M. P., Ciupik, L., Collins-Hughes, E., Cui, W., Duke, C., Dumm, J., Falcone, A., E-mail: afurniss@ucsc.edu, E-mail: pafortin@cfa.harvard.edu, E-mail: deirdre@llr.in2p3.fr, Collaboration: VERITAS Collaboration, and and others. 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., Errando, M., Archambault, S., Arlen, T., Aune, T., Bouvier, A., Beilicke, M., Buckley, J. H., Bugaev, V., Dickherber, R., Benbow, W., Boettcher, M., Cesarini, A., Connolly, M. P., Ciupik, L., Collins-Hughes, E., Cui, W., Duke, C., Dumm, J., Falcone, A., E-mail: afurniss@ucsc.edu, E-mail: pafortin@cfa.harvard.edu, E-mail: deirdre@llr.in2p3.fr, Collaboration: VERITAS Collaboration, & and others. VERITAS OBSERVATIONS OF SIX BRIGHT, HARD-SPECTRUM FERMI-LAT BLAZARS. United States. doi:10.1088/0004-637X/759/2/102.
Aliu, E., Errando, M., Archambault, S., Arlen, T., Aune, T., Bouvier, A., Beilicke, M., Buckley, J. H., Bugaev, V., Dickherber, R., Benbow, W., Boettcher, M., Cesarini, A., Connolly, M. P., Ciupik, L., Collins-Hughes, E., Cui, W., Duke, C., Dumm, J., Falcone, A., E-mail: afurniss@ucsc.edu, E-mail: pafortin@cfa.harvard.edu, E-mail: deirdre@llr.in2p3.fr, Collaboration: VERITAS Collaboration, and and others. Sat . "VERITAS OBSERVATIONS OF SIX BRIGHT, HARD-SPECTRUM FERMI-LAT BLAZARS". United States. doi:10.1088/0004-637X/759/2/102.
@article{osti_22086406,
title = {VERITAS OBSERVATIONS OF SIX BRIGHT, HARD-SPECTRUM FERMI-LAT BLAZARS},
author = {Aliu, E. and Errando, M. and Archambault, S. and Arlen, T. and Aune, T. and Bouvier, A. and Beilicke, M. and Buckley, J. H. and Bugaev, V. and Dickherber, R. and Benbow, W. and Boettcher, M. and Cesarini, A. and Connolly, M. P. and Ciupik, L. and Collins-Hughes, E. and Cui, W. and Duke, C. and Dumm, J. and Falcone, A., E-mail: afurniss@ucsc.edu, E-mail: pafortin@cfa.harvard.edu, E-mail: deirdre@llr.in2p3.fr and Collaboration: VERITAS Collaboration and and others},
abstractNote = {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. 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},
issn = {0004-637X},
number = 2,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}