Estimating the Spin of MAXI J1820+070 From Soft State by Insight-HXMT

IF 1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Astronomische Nachrichten Pub Date : 2025-03-25 DOI:10.1002/asna.20250021

Chun-Xiang Liao, Chao Huang, Jian-Chao Feng, Ai-Jun Dong

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Abstract

MAXI J1820+070, discovered by the Monitor of All-sky X-ray Image (MAXI) in 2018, is a well-known black hole X-ray binary. This study presents a detailed spectral analysis using 2018 observations from the Insight Hard X-ray Modulation Telescope (HXMT). We explored the evolution of the Fe line shape and found it stable at 6.4 keV in the high/soft state, indicating the inner radius of the accretion disk remains at the Innermost Stable Circular Orbit. Additionally, we estimated the black hole spin ( $a_{*}$ ) using the continuum fitting method, obtaining a spin of $a_{*} {= 0.122}_{- 0.016}^{+ 0.013}$ , consistent with previous results. Through these findings, this study has contributed to the spectral analysis and spin parameter estimation of black hole X-ray binary systems, offering valuable insights into black hole behavior and its role in cosmology.

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用Insight-HXMT从软态估计MAXI J1820+070的自旋

MAXI J1820+070是由全天x射线图像监视器（MAXI）于2018年发现的，是一个著名的黑洞x射线双星。本研究利用洞察号硬x射线调制望远镜（HXMT） 2018年的观测数据进行了详细的光谱分析。我们探索了铁线形状的演变，发现它在高/软状态下稳定在6.4 keV，表明吸积盘的内半径保持在最内层稳定圆轨道。此外，我们使用连续统拟合方法估计了黑洞自旋（a * $$ {a}_{\ast } $$），得到自旋a * = 0.122−0.016 + 0.013 $$ {a}_{\ast }={0.122}_{-0.016}^{+0.013} $$，与之前的结果一致。通过这些发现，本研究为黑洞x射线双星系统的光谱分析和自旋参数估计做出了贡献，为黑洞行为及其在宇宙学中的作用提供了有价值的见解。

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来源期刊

Astronomische Nachrichten 地学天文-天文与天体物理

CiteScore

1.80

自引率

11.10%

发文量

审稿时长

4-8 weeks

期刊介绍： Astronomische Nachrichten, founded in 1821 by H. C. Schumacher, is the oldest astronomical journal worldwide still being published. Famous astronomical discoveries and important papers on astronomy and astrophysics published in more than 300 volumes of the journal give an outstanding representation of the progress of astronomical research over the last 180 years. Today, Astronomical Notes/ Astronomische Nachrichten publishes articles in the field of observational and theoretical astrophysics and related topics in solar-system and solar physics. Additional, papers on astronomical instrumentation ground-based and space-based as well as papers about numerical astrophysical techniques and supercomputer modelling are covered. Papers can be completed by short video sequences in the electronic version. Astronomical Notes/ Astronomische Nachrichten also publishes special issues of meeting proceedings.