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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >X-ray echo from the sagittarius C complex and 500-year activity history of sagittarius A
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X-ray echo from the sagittarius C complex and 500-year activity history of sagittarius A

机译：射手座C复合体的X射线回声和射手座A的500年活动历史

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摘要

This paper presents Suzaku results obtained for the Sagittarius (Sgr) C region using the concept of X-ray reflection nebulae (XRNe) as the echo of past flares from a super-massive black hole, Sgr A. The SgrC complex is composed of several molecular clouds proximately located in projected distance. The X-ray spectra of SgrC were analyzed based on the view that XRNe are located inside the Galactic center plasma X-ray emission with an oval distribution around Sgr A. We found that XRNe are largely separated in the line-of-sight position, and are associated with molecular clouds in different velocity ranges detected by radio observations. We also applied the same analysis to SgrB XRNe, and completed a long-term light curve for Sgr Aoccurring in the past. As a new finding, we determined that Sgr Ahas already experienced periods of high luminosity, ～500 years ago, which is longer than the previously reported value. Our results are consistent with a scenario that Sgr Awas continuously active with sporadic flux variabilities of LX = (1-3) × 10~(39) erg s1 in the past 50 to 500 years. The average past luminosity was approximately 4-6 orders of magnitude higher than that presently observed. In addition, two short-term flares of 5-10 years have been found. Thus, the past X-ray flare should not be a single short-term flare, but can be interpreted as multiple flares superposed on a long-term high state.
机译：本文介绍了使用X射线反射星云（XRNe）概念作为超大质量黑洞Sgr A过去耀斑的回声获得的射手座（Sgr）C区的朱雀结果。SgrC配合物由几个分子云紧邻投影距离。基于以下观点分析了SgrC的X射线光谱：XRNe位于银河中心等离子体X射线发射的内部，并且在Sgr A周围呈椭圆形分布。我们发现XRNe在视线位置上很大程度上分开，并与通过无线电观测发现的不同速度范围内的分子云有关。我们还对SgrB XRNe应用了相同的分析，并完成了过去Sgr发生的长期光照曲线。作为一项新发现，我们确定Sgr Aha已经经历了大约500年前的高发光度，这比以前报道的值更长。我们的结果与以下情况一致：在过去的50至500年中，Sgr A持续活跃，其零星通量变化为LX =（1-3）×10〜（39）erg s1。过去的平均光度比目前观察到的高约4-6个数量级。此外，还发现了两个5-10年的短期耀斑。因此，过去的X射线耀斑不应是单个短期耀斑，而可以解释为叠加在长期高状态的多个耀斑。

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