arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.01934astro-ph.HEgr-qc
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用X射线反射光谱法检验开普勒圆盘假说

Testing the Keplerian disk hypothesis using X-ray reflection spectroscopy

Ashutosh Tripathi, Biao Zhou, Askar B. Abdikamalov, Dimitry Ayzenberg, Cosimo Bambi, Sourabh Nampalliwar

摘要:

Novikov-Thorne模型是描述黑洞周围几何薄和光学厚的吸积盘的标准框架,并被广泛用于研究吸积黑洞的电磁谱。该模型的假设之一是气体粒子在赤道平面上的近测地线圆形轨道上运动。在这项工作中,我们提出了使用X射线反射光谱测试的粒子在吸积盘的开普勒速度。我们提出了一个修改后的版本,其中我们引入了一个唯象参数,$α$,量化开普勒运动的可能偏差。我们使用我们的模型,以适应朱雀观测的黑洞二进制GRS 1915+105。我们发现,估计的$α$是相关的磁盘,$i$的倾斜角,我们可以测试开普勒磁盘假设的存在下,一个强大的和独立的测量$i$。

英文摘要:

The Novikov-Thorne model is the standard framework for the description of geometrically thin and optically thick accretion disks around black holes and is widely used to study the electromagnetic spectra of accreting black holes. One of the assumptions of the model is that the particles of the gas move on nearly-geodesic circular orbits on the equatorial plane. In this work, we propose to test the Keplerian velocity of the particles in the accretion disk using X-ray reflection spectroscopy. We present a modified version of RELXILL in which we introduce a phenomenological parameter, $α$, to quantify possible deviations from Keplerian motion. We use our model to fit a Suzaku observation of the black hole binary GRS 1915+105. We find that the estimate of $α$ is correlated to that of the inclination angle of the disk, $i$, and that we could test the Keplerian disk hypothesis in the presence of a robust and independent measurement of $i$.

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。

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