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arXiv 1607.00596gr-qcastro-ph.HE
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利用X射线反射光谱检验克尔黑洞假说

Testing the Kerr black hole hypothesis using X-ray reflection spectroscopy

Cosimo Bambi, Alejandro Cardenas-Avendano, Thomas Dauser, Javier A. Garcia, Sourabh Nampalliwar

摘要:

我们提出了第一个X射线反射模型来检验天体物理黑洞度规可以用Kerr解描述的假设。我们采用坎宁安提出的传递函数的形式主义。本文将薄吸积盘反射谱的计算分为两部分:传递函数的计算和吸积盘内任意发射点的局域谱的计算。传递函数只依赖于背景度规,并考虑了所有的相对论效应(引力红移、多普勒增强和光弯曲)。我们的代码计算的传递函数的约翰森度规描述的时空,可以很容易地扩展到任何固定的,轴对称的,渐近平坦的时空。传递函数和单线形状的克尔度规进行了比较,从现有的代码计算,检查我们达到必要的精度。我们还用NuSTAR和LAD/eXTP模拟了一些观测结果,并用我们的新模型拟合了数据,以显示当前和未来观测的潜在能力,以限制可能偏离克尔度量。

英文摘要:

We present the first X-ray reflection model for testing the assumption that the metric of astrophysical black holes is described by the Kerr solution. We employ the formalism of the transfer function proposed by Cunningham. The calculations of the reflection spectrum of a thin accretion disk are split into two parts: the calculation of the transfer function and the calculation of the local spectrum at any emission point in the disk. The transfer function only depends on the background metric and takes into account all the relativistic effects (gravitational redshift, Doppler boosting, and light bending). Our code computes the transfer function for a spacetime described by the Johannsen metric and can easily be extended to any stationary, axisymmetric, and asymptotically flat spacetime. Transfer functions and single line shapes in the Kerr metric are compared with those calculated from existing codes to check that we reach the necessary accuracy. We also simulate some observations with NuSTAR and LAD/eXTP and fit the data with our new model to show the potential capabilities of current and future observations to constrain possible deviations from the Kerr metric.

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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