Veritas observations of the gamma-ray binary LS I+61 303


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Acciari V. A. , Beilicke M., Blaylock G., Bradbury S. M. , Buckley J. H. , Bugaev V., ...Daha Fazla

ASTROPHYSICAL JOURNAL, cilt.679, sa.2, ss.1427-1432, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 679 Konu: 2
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1086/587736
  • Dergi Adı: ASTROPHYSICAL JOURNAL
  • Sayfa Sayıları: ss.1427-1432

Özet

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.