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arXiv 2008.03829astro-ph.HE
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扭曲黑洞吸积盘的铁谱线轮廓

The Iron Line Profile from Warped Black Hole Accretion Disks

Quincy Abarr, Henric Krawczynski

摘要:

黑洞吸积盘荧光铁谱线的轮廓是对黑洞性质(如自旋和倾角)的有力诊断。然而,最先进的理论认为吸积盘的角动量与黑洞的角动量一致;这是一个非常有约束力的假设,不太可能适用于许多甚至大多数天体物理系统。在这里,我们提出了第一个模拟的反射光谱从翘曲的吸积盘使用一个现实的反射发射模型的基础上的xillver代码。我们提出的影响,径向位置的翘曲和倾斜角上的线轮廓,并强调,结果是高度依赖于观察者相对于倾斜角的方位角位置。我们在XSpec中用标准的relxill灯柱模型拟合这些轮廓,以量化忽略磁盘扭曲对推断的黑洞自旋和倾角的影响。我们表明,适合与两个组件relxill可以用来获得更准确的自旋和倾角估计。

英文摘要:

The profile of the fluorescent iron line from black hole accretion disks is a powerful diagnostic of black hole properties, such as spin and inclination. The state-of-the-art, however, considers an accretion disk whose angular momentum is aligned with that of the black hole; this is a very constraining assumption which is unlikely to apply to many or even most astrophysical systems. Here, we present the first simulation of the reflection spectrum from warped accretion disks using a realistic model of the reflected emission based on the xillver code. We present the effects that the radial location of the warp and the tilt angle have on the line profile, and highlight that the results are highly dependent on the azimuth position of the observer relative to the tilt angle. We fit these profiles in XSpec with the standard relxill lamppost model to quantify the effect that neglecting the disk warps has on the inferred black hole spins and inclinations. We show that fits with two-component relxill can be used to derive more accurate spin and inclination estimates.

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