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Veritas observations of the γ‐ray binary ls i +61 303

Acciari, V. A.
; 
Beilicke, M.
; 
Blaylock, G.
; 
Bradbury, S. M.
; 
Buckley, J. H.
; 
Bugaev, V.
; 
Butt, Y.
; 
Byrum, K. L.
; 
Celik, O.
; 
Cesarini, A.
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Identifiers
http://hdl.handle.net/10379/10117
https://doi.org/10.13025/28035
Repository DOI
10.1086/587736
Publication Date
2008-06-01
Keywords
acceleration of particles, binaries : general, gamma rays : observations, stars : individual (ls i+61 303), ls-i +61-degrees-303, microquasar ls-i+61-303, lsi+61-degrees-303, discovery, emission, model, modulation, astronomy, spectrum, catalog
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Article
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Acciari, V. A. Beilicke, M.; Blaylock, G.; Bradbury, S. M.; Buckley, J. H.; Bugaev, V.; Butt, Y.; Byrum, K. L.; Celik, O.; Cesarini, A.; Ciupik, L.; Chow, Y. C. K.; Cogan, P.; Colin, P.; Cui, W.; Daniel, M. K.; Duke, C.; Ergin, T.; Falcone, A. D.; Fegan, S. J.; Finley, J. P.; Fortin, P.; Fortson, L. F.; Gall, D.; Gibbs, K.; Gillanders, G. H.; Grube, J.; Guenette, R.; Hanna, D.; Hays, E.; Holder, J.; Horan, D.; Hughes, S. B.; Hui, C. M.; Humensky, T. B.; Kaaret, P.; Kieda, D. B.; Kildea, J.; Konopelko, A.; Krawczynski, H.; Krennrich, F.; Lang, M. J.; LeBohec, S.; Lee, K.; Maier, G.; McCann, A.; McCutcheon, M.; Millis, J.; Moriarty, P.; Mukherjee, R.; Nagai, T.; Ong, R. A.; Pandel, D.; Perkins, J. S.; Pizlo, F.; Pohl, M.; Quinn, J.; Ragan, K.; Reynolds, P. T.; Rose, H. J.; Schroedter, M.; Sembroski, G. H.; Smith, A. W.; Steele, D.; Swordy, S. P.; Toner, J. A.; Valcarcel, L.; Vassiliev, V. V.; Wagner, R.; Wakely, S. P.; Ward, J. E.; Weekes, T. C.; Weinstein, A.; White, R. J.; Williams, D. A.; Wissel, S. A.; Wood, M.; Zitzer, B. (2008). Veritas observations of the γ‐ray binary ls i +61 303. The Astrophysical Journal 679 (2), 1427-1432
Abstract
LS I +61 303 is one of only a few high-mass X-ray binaries currently detected at high significance in very high energy gamma-rays. The system was observed over several orbital cycles ( between 2006 September and 2007 February) with the VERITAS array of imaging air Cerenkov telescopes. A signal of gamma-rays with energies above 300 GeV is found with a statistical significance of 8.4 standard deviations. The detected flux is measured to be strongly variable; the maximum flux is found during most orbital cycles at apastron. The energy spectrum for the period of maximum emission can be characterized by a power law with a photon index of Gamma = 2.40 +/- 0.16(stat) +/- 0.2(sys) and a flux above 300 GeV corresponding to 15% - 20% of the flux from the Crab Nebula.
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IOP Publishing
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Attribution-NonCommercial-NoDerivs 3.0 Ireland
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Externally hosted open access publications with University of Galway authors (2)