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arXiv 2004.12589astro-ph.HEgr-qc
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Kerr黑洞周围有限厚度薄吸积盘的热谱

Thermal spectra of thin accretion disks of finite thickness around Kerr black holes

Menglei Zhou, Askar B. Abdikamalov, Dimitry Ayzenberg, Cosimo Bambi, Victoria Grinberg, Ashutosh Tripathi

摘要:

对黑洞的几何薄和光学厚的吸积盘的热谱分析,即所谓的连续拟合方法,是测量黑洞自旋的主要技术之一。目前的模型通常近似的磁盘作为无限薄,而在现实中的磁盘厚度是有限的,并增加了黑洞质量吸积率的增加。本文提出一个XSPEC模型来计算Kerr黑洞周围有限厚度薄吸积盘的多温黑体谱。我们测试我们的新模型与RXTE观测的黑洞二进制GRS 1915+105。我们发现,与新的模型推断的自旋值略高于与一个无限薄的磁盘模型获得的自旋值,但差异很小,目前的效果是次要的,相对于其他来源的不确定性在最终的自旋测量。

英文摘要:

The analysis of the thermal spectrum of geometrically thin and optically thick accretion disks of black holes, the so-called continuum-fitting method, is one of the leading techniques for measuring black hole spins. Current models normally approximate the disk as infinitesimally thin, while in reality the disk thickness is finite and increases as the black hole mass accretion rate increases. Here we present an XSPEC model to calculate the multi-temperature blackbody spectrum of a thin accretion disk of finite thickness around a Kerr black hole. We test our new model with an RXTE observation of the black hole binary GRS 1915+105. We find that the spin value inferred with the new model is slightly higher than the spin value obtained with a model with an infinitesimally thin disk, but the difference is small and the effect is currently subdominant with respect to other sources of uncertainties in the final spin measurement.

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