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arXiv 2401.08545astro-ph.HE
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用NuSTAR数据测试广义相对论:II

Testing General Relativity with NuSTAR data of Galactic Black Holes : II

Xinjiang Astronomical Observatory, CAS(中国科学院新疆天文台);Fudan University(复旦大学);Texas A&M University(德克萨斯农工大学);Southern Methodist University(南卫理公会大学);New Uzbekistan University(新乌兹别克斯坦大学);Ulugh Beg Astronomical Institute(乌鲁伯格天文研究所)

Ashutosh Tripathi, Swarnim Shashank, Gitika Mall, Askar Abdikamalov

AI总结:

利用NuSTAR数据测试广义相对论,通过分析四个X射线双星的观测结果,验证克尔解的适用性。

摘要:

广义相对论预测恒星物理黑洞周围的时空度规由克尔解描述,即一个无残留电荷的旋转黑洞。在前一篇论文中,我们分析了六个X射线双星的NuSTAR观测数据,利用最先进的相对论模型获得了对变形参数α₁₃的约束。在本工作中,我们继续分析四个更多X射线双星的NuSTAR观测数据;其中两个,即Swift J174540.7-290015和Swift J174540.2-290037,是接近银河系中心超大质量黑洞的X射线暂现源。其他两个源具有复杂的吸收,这通过时间分辨率和通量分辨率的光谱学加以考虑。MAXI J1631-479的观测被分为两部分以应对通量的突然增加。V404 Cygni光谱通过结合两次连续观测得到,被分为5个通量状态,并通过量化6.5-7.0 keV能量范围内的超额通量来考虑吸收。获得的约束与克尔假说一致,并与之前研究和引力事件获得的约束相当。本工作表明,即使高吸收源也可用于测试克尔假说,这可以通过仔细的数据还原和后续数据分析实现。

英文摘要:

General relativity predicts the spacetime metric around an astrophysical black hole to be described by the Kerr solution, which is a massive rotating black hole without any residual charge. In a previous paper, we analyzed the NuSTAR observations of six X-ray binaries to obtain constraints on the deformation parameter $α_{13}$ using a state-of-the-art relativistic model. In this work, we continue analyzing NuSTAR observations of four more X-ray Binaries; two of which, namely Swift~J174540.7--290015 and Swift~J174540.2--290037 are X-ray Transients very close to the supermassive black hole at the center of our galaxy. The other two sources have complicated absorption, which is accounted for by time- and flux-resolved spectroscopy. The observation of MAXI J1631-479 is divided into two parts to account for the sudden increase in flux. The V404 Cygni spectra, obtained by combining two consecutive observations, are divided into 5 flux states and also account for absorption by quantifying the excess flux in the energy range of 6.5-7.0 keV. The constraints obtained are consistent with the Kerr hypothesis and are comparable with those obtained in previous studies and those from gravitational events. This work shows that even highly absorbed sources can be used for testing the Kerr hypothesis, which is possible with careful data reduction and subsequent data analysis.

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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