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arXiv 2002.02951astro-ph.HE
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1 E 1740.7-2942的宽频带X射线分析:对自旋、倾斜和暂定黑洞质量的限制

Broadband X-ray analysis of 1E 1740.7-2942: constraints on spin, inclination and a tentative black hole mass

Paulo E. Stecchini, Flavio D'Amico, Francisco Jablonski, Manuel Castro, Joao Braga

摘要:

1 E 1740.7-2942是银河系中心区域最强的硬X射线发射体之一,被认为是高质量X射线双星系统中的一个黑洞。虽然在X射线中进行了广泛的研究,但关于该系统的基本性质的许多方面仍然是未知的。例如,迄今为止对1 E 1740.7-2942的X射线数据分析尚未揭示反射分量的特征,其建模可用于估计黑洞的自旋和圆盘的倾斜度等参数。我们在这里报告的反射分量的分析,目前在一个公共的\textit{NuSTAR}观察,还没有受到任何以前的研究,这些参数的确定。我们包括\textit{XMM-Newton}和\textit{INTEGRAL}数据,以建立一个组合的光谱,使联合分析的光盘和comptonization组件。结果指向一个相对较高的倾角盘$\gtrsim$ 50 $^{\circ}$(3 $σ$)和一个接近最大速度的旋转黑洞。前者与以前的无线电研究一致,后者是首次报道。最后,我们遵循最近的努力,重量黑洞的X射线光谱和发现的结果表明,黑洞质量约为5 M $_\odot$为1 E 1740.7-2942的方法。

英文摘要:

1E 1740.7-2942 is one of the strongest hard X-ray emitters in the Galactic Centre region, believed to be a black hole in a high-mass X-ray binary system. Although extensively studied in X-rays, many aspects about the underlying nature of the system are still unknown. For example, X-ray data analyses of 1E 1740.7-2942 up to date have not yet unveiled the signature of a reflection component, whose modelling could be used to estimate parameters such as the spin of the black hole and inclination of the disc. We report here on the determination of these parameters from the analysis of the reflection component present in a public \textit{NuSTAR} observation which hasn't been subject to any previous study. We include \textit{XMM-Newton} and \textit{INTEGRAL} data to build a combined spectrum, enabling a joint analysis of both the disc and comptonisation components. Results point to a relatively high inclination disc $\gtrsim$ 50$^{\circ}$ (3 $σ$) and a near-maximum speed rotating black hole. The former is in agreement with a previous radio study and the latter is reported here for the first time. Lastly, we follow the methodology of recent efforts to weight black holes with only X-ray spectra and find results that suggest a black hole mass of about 5 M$_\odot$ for 1E 1740.7-2942.

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