LONG-TERM TeV AND X-RAY OBSERVATIONS OF THE GAMMA-RAY BINARY HESS J0632+057
LONG-TERM TeV AND X-RAY OBSERVATIONS OF THE GAMMA-RAY BINARY HESS J0632+057
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DOI：
10.1088/0004-637x/780/2/168
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发表时间：
2013-11
期刊：
影响因子：
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通讯作者：
E. Aliu;S. Archambault;T. Aune;B. Behera;M. Beilicke;W. Benbow;K. Berger;R. Bird;A. Bouvier
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文献类型：
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作者：
E. Aliu;S. Archambault;T. Aune;B. Behera;M. Beilicke;W. Benbow;K. Berger;R. Bird;A. Bouvier
HESS J 0632 +057是迄今为止已知的唯一一颗伽马射线双星，其在天空中的位置允许北方和南半球的地面观测站进行观测。在这里，我们报告了HESS J 0632 +057的长期观测结果，这些观测是通过高能辐射成像望远镜阵列系统和高能立体系统切伦科夫望远镜以及X射线卫星雨燕进行的，时间范围从2004年到2012年，覆盖了系统的大部分轨道。甚高能量（VHE）发射被发现是可变的，并与在X射线能量。由X射线数据得到的轨道周期为天，与以前的结果一致，P =（321 ± 5）天。VHE光变曲线在接近0.3的轨道相位处显示出一个明显的最大值，或者说在经过近星点100天后，这与X射线发射的周期性增强相吻合。此外，对TeV数据的分析首次显示了在轨道相位0.6-0.9时的统计学显著性（>6.5σ）检测。所获得的伽马射线和X射线光变曲线和源发射在这两个能量带的相关性进行了讨论的背景下，最近的星历获得的系统。我们的结果进行了比较，为其他伽马射线双星的报告。
HESS J0632+057 is the only gamma-ray binary known so far whose position in the sky allows observations with ground-based observatories in both the northern and southern hemispheres. Here we report on long-term observations of HESS J0632+057 conducted with the Very Energetic Radiation Imaging Telescope Array System and High Energy Stereoscopic System Cherenkov telescopes and the X-ray satellite Swift, spanning a time range from 2004 to 2012 and covering most of the system's orbit. The very-high-energy (VHE) emission is found to be variable and is correlated with that at X-ray energies. An orbital period of days is derived from the X-ray data set, which is compatible with previous results, P = (321 ± 5) days. The VHE light curve shows a distinct maximum at orbital phases close to 0.3, or about 100 days after periastron passage, which coincides with the periodic enhancement of the X-ray emission. Furthermore, the analysis of the TeV data shows for the first time a statistically significant (>6.5σ) detection at orbital phases 0.6–0.9. The obtained gamma-ray and X-ray light curves and the correlation of the source emission at these two energy bands are discussed in the context of the recent ephemeris obtained for the system. Our results are compared to those reported for other gamma-ray binaries.