论文标题
重新审视伽玛射线时的微Quasar V404 Cygni的检测：静止的短爆炸事件
Detection of the microquasar V404 Cygni at gamma-rays revisited: short flaring events in quiescence
论文作者
论文摘要
先前据报道，微夸张V404 Cygni（也称为GS 2023+338）在其2015年爆发期间的子日期内的GEV伽马射线排放较弱。为了在此黑洞二进制系统的高能范围内提供更详细的信息，我们对使用大面积望远镜（LAT）在Fermi Gamma-ray空间望远镜（Fermi）获得的数据进行分析。使用的LAT数据库和源目录都是最新的。除了先前报道的2015年爆发峰值的检测外，我们在2015年8月17日 - 19日（2015年爆发结束时）在2015年8月17日的3天时间内发现了源的检测（$ \ sim4σ$），并在2016年8月23日在2016年8月23日发现了一个令人信服的检测（$ \ \ simeq7σ$）。后者的高显着性检测表明，源的伽马射线发射是柔软的，具有光子指数$γ\ sim 2.9 $。由于微QuaSar的伽马射线发射被认为与它们的JET活性相关，因此我们通过与那些经过良好研究的病例（即CYG X-3和CYG X-1进行比较）来讨论结果。该检测有助于将V404 Cygni识别为具有静态状态下可检测到的伽马射线发射的微夸张，并为微Quasar组添加了有趣的特征，或在更一般的环境中为带Jets的X射线二进制文件添加了有趣的特征。
The microquasar V404 Cygni (also known as GS 2023+338) was previously reported to have weak GeV gamma-ray emission in sub-day time periods during its 2015 outburst. In order to provide more detailed information at the high energy range for this black hole binary system, we conduct analysis to the data obtained with the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope (Fermi). Both LAT database and source catalog used are the latest. In addition to the previously reported detection at the peak of the 2015 outburst, we find possible detection ($\sim 4σ$) of the source during 3-day time period of 2015 Aug. 17--19 (at the end of the 2015 outburst) and one convincing detection ($\simeq 7σ$) in 2016 Aug. 23--25. The latter high-significance detection shows that the gamma-ray emission of the source is soft with photon index $Γ\sim 2.9$. As gamma-ray emission from microquasars is considered to be associated with their jet activity, we discuss the results by comparing with those well studied cases, namely Cyg X-3 and Cyg X-1. The detection helps identify V404 Cygni as a microquasar with detectable gamma-ray emission in its quiescent state, and adds interesting features to the microquasar group, or in a more general context to X-ray binaries with jets.
