VERITAS 对伽马射线双星 LS I +61 303 的观测
天体物理学
2009-11-13 v1
摘要
LS I +61 303 是目前仅在甚高能伽马射线波段以高显著性被探测到的少数大质量 X 射线双星之一。该系统于 2006 年 9 月至 2007 年 2 月期间，利用 VERITAS 成像空气切伦科夫望远镜阵列在数个轨道周期内进行了观测。探测到能量高于 300 GeV 的伽马射线信号，统计显著性为 8.4 个标准差。测得的通量变化剧烈；在大多数轨道周期中，最大通量出现在远星点。最大辐射期间的能谱可由幂律描述，光子指数为 Gamma=2.40+-0.16_stat+-0.2_sys，高于 300 GeV 的通量相当于蟹状星云通量的 15-20%。
关键词
引用
@article{arxiv.0802.2363,
title = {VERITAS Observations of the gamma-Ray Binary LS I +61 303},
author = {V. A. Acciari and M. Beilicke and G. Blaylock and S. M. Bradbury and J. H. Buckley and V. Bugaev and Y. Butt and K. L. Byrum and O. Celik and A. Cesarini and L. Ciupik and Y. C. K. Chow and P. Cogan and P. Colin and W. Cui and M. K. Daniel and C. Duke and T. Ergin and A. D. Falcone and S. J. Fegan and J. P. Finley and P. Fortin and L. F. Fortson and D. Gall and K. Gibbs and G. H. Gillanders and J. Grube R. Guenette and D. Hanna and E. Hays and J. Holder and D. Horan and S. B. Hughes and C. M. Hui and T. B. Humensky and P. Kaaret and D. B. Kieda and J. Kildea and A. Konopelko and H. Krawczynski and F. Krennrich and M. J. Lang and S. LeBohec and K. Lee and G. Maier and A. McCann and M. McCutcheon and J. Millis and P. Moriarty and R. Mukherjee and T. Nagai and R. A. Ong and D. Pandel and J. S. Perkins and F. Pizlo and M. Pohl and J. Quinn and K. Ragan and P. T. Reynolds and H. J. Rose and M. Schroedter and G. H. Sembroski and A. W. Smith and D. Steele and S. P. Swordy and J. A. Toner and L. Valcarcel and V. V. Vassiliev and R. Wagner and S. P. Wakely and J. E. Ward and T. C. Weekes and A. Weinstein and R. J. White and D. A. Williams and S. A. Wissel and M. Wood and B. Zitzer},
journal= {arXiv preprint arXiv:0802.2363},
year = {2009}
}
备注
accepted for publication in The Astrophysical Journal