EVIDENCE FOR LONG-TERM GAMMA-RAY AND X-RAY VARIABILITY FROM THE UNIDENTIFIED TeV SOURCE HESS J0632+057
EVIDENCE FOR LONG-TERM GAMMA-RAY AND X-RAY VARIABILITY FROM THE UNIDENTIFIED TeV SOURCE HESS J0632+057
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DOI：
10.1088/0004-637x/698/2/l94
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发表时间：
2009-05
期刊：
影响因子：
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通讯作者：
V. Acciari;E. Aliu;T. Arlen;M. Beilicke;W. Benbow;D. Boltuch;S. Bradbury;J. Buckley;V. Bugaev
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文献类型：
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作者：
V. Acciari;E. Aliu;T. Arlen;M. Beilicke;W. Benbow;D. Boltuch;S. Bradbury;J. Buckley;V. Bugaev
HESS J0632+057 是仅有的两个未识别的极高能伽马射线源之一，它们在实验分辨率内呈点状。它可能与大质量 Be 星 MWC 148 相关，并被认为类似于已知的 TeV 双星系统，如 LS I +61 303 或 LS 5039。HESS J0632+057 在 2006 年、2008 年和 2009 年被 VERITAS 观测了 31 小时。在这些观测期间，从海斯J0632+057。对应于蟹状星云通量的 1.1% 的通量上限是从 VERITAS 数据得出的。 VERITAS 未检测到的情况以 99.993% 的概率排除了 HESS J0632+057 是稳定伽马射线发射器的可能性。使用 Swift X 射线望远镜进行的同期 X 射线观测显示，在 1-10 keV 范围内的通量比 HESS J0632+057 早期的 X 射线观测高出 1.8 ± 0.4 倍。伽马射线和 X 射线通量的变化支持将该物体解释为伽马射线发射双星。
HESS J0632+057 is one of only two unidentified very-high-energy gamma-ray sources which appear to be point-like within experimental resolution. It is possibly associated with the massive Be star MWC 148 and has been suggested to resemble known TeV binary systems like LS I +61 303 or LS 5039. HESS J0632+057 was observed by VERITAS for 31 hr in 2006, 2008, and 2009. During these observations, no significant signal in gamma rays with energies above 1 TeV was detected from the direction of HESS J0632+057. A flux upper limit corresponding to 1.1% of the flux of the Crab Nebula has been derived from the VERITAS data. The nondetection by VERITAS excludes with a probability of 99.993% that HESS J0632+057 is a steady gamma-ray emitter. Contemporaneous X-ray observations with the Swift X-Ray Telescope reveal a factor of 1.8 ± 0.4 higher flux in the 1–10 keV range than earlier X-ray observations of HESS J0632+057. The variability in the gamma-ray and X-ray fluxes supports interpretation of the object as a gamma-ray emitting binary.