arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2108.00375astro-ph.HEgr-qc
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具有径向盘密度分布的反射模型

A reflection model with a radial disk density profile

Askar B. Abdikamalov, Dimitry Ayzenberg, Cosimo Bambi, Honghui Liu, Ashutosh Tripathi

摘要:

本文提出了一个相对论反射模型--XILLDGRAD_NK,其中允许吸积盘的电子密度具有径向幂律分布。电离参数也有一个非恒定的径向分布,并计算自洽从电子密度和发射率。我们通过分析EXO 1846-031中银河系黑洞在2019年最后一次爆发期间的NuSTAR光谱以及对Athena和eXTP相同来源的假定未来观测,显示了在我们的模型中实施电子密度梯度的影响。对于NuSTAR光谱,我们发现新模型提供了更好的拟合,但模型参数的估计没有显著差异。对于Athena+eXTP模拟,我们发现没有磁盘密度分布的模型不适合测试紧凑物体周围的时空度量,因为建模的不确定性可能会错误地导致从克尔解中找到非零变形。

英文摘要:

In this paper we present RELXILLDGRAD_NK, a relativistic reflection model in which the electron density of the accretion disk is allowed to have a radial power-law profile. The ionization parameter has also a non-constant radial profile and is calculated self-consistently from the electron density and the emissivity. We show the impact of the implementation of the electron density gradient in our model by analyzing a NuSTAR spectrum of the Galactic black hole in EXO 1846-031 during its last outburst in 2019 and a putative future observation of the same source with Athena and eXTP. For the NuSTAR spectrum, we find that the new model provides a better fit, but there is no significant difference in the estimation of the model parameters. For the Athena+eXTP simulation, we find that a model without a disk density profile is unsuitable to test the spacetime metric around the compact object, in the sense that modeling uncertainties can incorrectly lead to finding a non-vanishing deformation from the Kerr solution.

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