来自绕黑洞轨道运行的斑点的初级和再处理辐射的变化
Variation in the primary and reprocessed radiation from an orbiting spot around a black hole
摘要：
我们研究光变曲线和光谱（等效的铁谱线宽度和其他一些光谱特性），它们是由吸积盘表面的反射引起的，在吸积盘被一个离轴的主要光源--一个X射线“耀斑”--照射后产生的，假设它是一个位于吸积盘正上方的点状光源，导致一个半径为dr/r<1的光斑。我们考虑了旋转黑洞附近的广义相对论效应（能量移动、光弯曲、时间延迟），发现它们都很重要，包括由于光斑运动引起的光弯曲和延迟放大。对于某些参数集，反射通量超过来自主分量的通量。我们表明，轨道引起的变化的等效宽度相对于其平均值可以高达30%的观察者的倾角为30度，更高的倾角。我们计算的反射通量的比率，主要通量和硬度比，我们发现显着变化的斑点阶段主要是小的轨道半径。如果耀斑靠近黑洞，这就提供了估计黑洞自旋下限的机会。
英文摘要：
We study light curves and spectra (equivalent widths of the iron line and some other spectral characteristics) which arise by reflection on the surface of an accretion disc, following its illumination by a primary off-axis source - an X-ray 'flare', assumed to be a point-like source just above the accretion disc resulting in a spot with radius dr/r<1. We consider General Relativity effects (energy shifts, light bending, time delays) near a rotating black hole, and we find them all important, including the light bending and delay amplification due to the spot motion. For some sets of parameters the reflected flux exceeds the flux from the primary component. We show that the orbit-induced variations of the equivalent width with respect to its mean value can be as high as 30% for the observer's inclination of 30 degrees, and much more at higher inclinations. We calculate the ratio of the reflected flux to the primary flux and the hardness ratio which we find to vary significantly with the spot phase mainly for small orbital radii. This offers the chance to estimate the lower limit of the black hole spin if the flare arises close to the black hole.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
