Testing general relativity with NuSTAR data of galactic black holes. II
文献类型：期刊论文
| 作者 | Tripathi, Ashutosh3,4,5,6,7; Shashank, Swarnim5,6; Mall, Gitika5,6; Abdikamalov, Askar B.1,2,5,6 |
| 刊名 | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
 |
| 出版日期 | 2026-02-11 |
| 页码 | 16 |
| 关键词 | black hole physics general relativity methods: data analysis |
| ISSN号 | 0004-6264 |
| DOI | 10.1093/pasj/psaf155 |
| 通讯作者 | Tripathi, Ashutosh(ashutosh31tripathi@gmail.com) |
| 英文摘要 | General relativity predicts the spacetime metric around an astrophysical black hole to be described by the Kerr solution, which relates to 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 alpha(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 five 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 the careful data reduction and subsequent data analysis. |
| WOS关键词 | RAY REFLECTION SPECTROSCOPY ; X-RAY ; V404 CYG ; HARD STATE ; SPECTRAL EVOLUTION ; ACCRETION DISKS ; 2015 OUTBURST ; SOFT STATE ; GX 339-4 ; MASS |
| 资助项目 | China Scholarship Council[2020GXZ016647] ; CAS Light of West China Program[2021-XBQNXZ-005] ; Tianshan Talent Training Program[2023TSYCCX0099] ; Urumqi Nanshan Astronomy and Deep Space Exploration Observation and Research Station of Xinjiang[XJYWZ2303] ; National SKA Program of China[2022SKA0120102] ; Xinjiang Tianchi Talent Program |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001687165200001 |
| 出版者 | OXFORD UNIV PRESS |
| 资助机构 | China Scholarship Council ; CAS Light of West China Program ; Tianshan Talent Training Program ; Urumqi Nanshan Astronomy and Deep Space Exploration Observation and Research Station of Xinjiang ; National SKA Program of China ; Xinjiang Tianchi Talent Program |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8567]  |
| 专题 | 星系宇宙学研究团组 |
| 通讯作者 | Tripathi, Ashutosh |
| 作者单位 | 1.Ulugh Beg Astron Inst, Tashkent 100052, Uzbekistan 2.New Uzbekistan Univ, Sch Nat Sci & Humanities, Tashkent 100007, Uzbekistan 3.Southern Methodist Univ, Dept Phys, 3215 Daniel Ave, Dallas, TX 75205 USA 4.Texas A&M Univ, George P & Cynthia Woods Mitchell Inst Fundamental, College Stn, TX 77843 USA 5.Fudan Univ, Dept Phys, Shanghai 200438, Peoples R China 6.Fudan Univ, Ctr Astron & Astrophys, Ctr Field Theory & Particle Phys, Shanghai 200438, Peoples R China 7.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tripathi, Ashutosh,Shashank, Swarnim,Mall, Gitika,et al. Testing general relativity with NuSTAR data of galactic black holes. II[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2026:16. |
| APA | Tripathi, Ashutosh,Shashank, Swarnim,Mall, Gitika,&Abdikamalov, Askar B..(2026).Testing general relativity with NuSTAR data of galactic black holes. II.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,16. |
| MLA | Tripathi, Ashutosh,et al."Testing general relativity with NuSTAR data of galactic black holes. II".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN (2026):16. |
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来源：新疆天文台
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