从热点的X射线谱看约束黑洞自旋的前景
On the Prospect of Constraining Black-Hole Spin Through X-ray Spectroscopy of Hotspots
摘要：
未来的X射线测量仪器有望使我们能够显著改善活动星系核中Fe K线的约束条件，如黑洞角动量（自旋）和假定的吸积盘的倾角。我们考虑的可能性，测量的持久性，时间平均的Fe K线发射的磁盘可以补充的观测一个本地化的耀斑，或“热点”，轨道接近的黑洞。虽然在观测上具有挑战性，但这种测量将恢复一些径向积分线轮廓固有的信息损失。我们目前的计算，这种情况下，评估在何种程度上，原则上，黑洞自旋可以测量。我们量化的可行性，这种方法使用现实的假设可能的测量不确定性。
英文摘要：
Future X-ray instrumentation is expected to allow us to significantly improve the constraints derivedfrom the Fe K lines in AGN, such as the black-hole angular momentum (spin) and the inclination angle of the putative accretion disk. We consider the possibility that measurements of the persistent, time-averaged Fe K line emission from the disk could be supplemented by the observation of a localized flare, or "hotspot", orbiting close to the black hole. Although observationally challenging, such measurements would recover some of the information loss that is inherent to the radially-integrated line profiles. We present calculations for this scenario to assess the extent to which, in principle, black-hole spin may be measured. We quantify the feasibility of this approach using realistic assumptions about likely measurement uncertainties.
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