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Title: Veritas observations of the microquasar Cygnus X-3

We report results from TeV gamma-ray observations of the microquasar Cygnus X-3. The observations were made with the Very Energetic Radiation Imaging Telescope Array System (VERITAS) over a time period from 2007 June 11 to 2011 November 28. VERITAS is most sensitive to gamma rays at energies between 85 GeV and 30 TeV. The effective exposure time amounts to a total of about 44 hr, with the observations covering six distinct radio/X-ray states of the object. No significant TeV gamma-ray emission was detected in any of the states, nor with all observations combined. The lack of a positive signal, especially in the states where GeV gamma rays were detected, places constraints on TeV gamma-ray production in Cygnus X-3. We discuss the implications of the results.
Authors:
 [1] ; ; ;  [2] ; ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ; ;  [8] ;  [9] ;  [10] ; ;  [11] ;  [12] ;  [13] ;  [14] ;  [15] more »; ; ; « less
  1. Physics Department, McGill University, Montreal, QC H3A 2T8 (Canada)
  2. Department of Physics, Washington University, St. Louis, MO 63130 (United States)
  3. Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645 (United States)
  4. Department of Physics and Astronomy and the Bartol Research Institute, University of Delaware, Newark, DE 19716 (United States)
  5. School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland)
  6. Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, CA 95064 (United States)
  7. Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439 (United States)
  8. Institute of Physics and Astronomy, University of Potsdam, D-14476 Potsdam-Golm (Germany)
  9. Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, IL 60605 (United States)
  10. School of Physics, National University of Ireland Galway, University Road, Galway (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 Physics and Astronomy, Barnard College, Columbia University, NY 10027 (United States)
  15. Department of Astronomy and Astrophysics, 525 Davey Lab, Pennsylvania State University, University Park, PA 16802 (United States)
Publication Date:
OSTI Identifier:
22348427
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 779; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; EMISSION; GAMMA RADIATION; GEV RANGE; LIMITING VALUES; QUASARS; STARS; TELESCOPES; TEV RANGE; X RADIATION