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GRS 1915+105的X射线能谱分析及黑洞自旋测量
作者:
作者单位:

1. 中国科学院国家天文台 北京 100101) ;2. 中国科学院国家天文台计算天体物理重点实验室 北京 100012;3. 中国科学院大学天文与空间科学学院 北京 100049

基金项目:

国家自然科学基金项目(U1838114)、科技部重点研发项目(2016YFA0400801)资助


X-ray Energy Spectra Study and Black Hole Spin Estimate of GRS 1915+105
Author:
  • WANG Yuan 1,2,3

    WANG Yuan

    National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101;Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012;School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049
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  • GOU Li-jun 1,2,3

    GOU Li-jun

    National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101;Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012;School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049
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  • ZHAO Xue-shan 1,2,3

    ZHAO Xue-shan

    National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101;Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012;School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049
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  • FENG Ye 1,2,3

    FENG Ye

    National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101;Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012;School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049
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  • JIA Nan 1,2,3

    JIA Nan

    National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101;Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012;School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049
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  • LIAO Zhen-xuan 1,2,3

    LIAO Zhen-xuan

    National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101;Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012;School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049
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  • LI Yu-feng 1,2,3

    LI Yu-feng

    National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101;Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012;School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049
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Affiliation:

1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101;2. Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012;3. School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049;

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    摘要:

    GRS 1915+105是银河系内的低质量黑洞X射线双星, 其能谱和黑洞自旋已经得到了广泛的研究. 自\lk 2018年6月开始, 其X射线流量下降到了低流量水平, 其间偶尔会产生多波段的耀发. 利用Insight-HXMT (Insight-Hard X-ray Modulation Telescope, 简称为慧眼)卫星在2020年8月30日到2020年10月13日之间对GRS 1915+105 的观测数据, 研究了其能谱特性, 发现在此次爆发过程中, X射线能谱可以用一个康普顿化的多温黑体谱很好地拟合. 整个爆发的硬度强度图(Hardness-Intensity Diagram, HID)一直处于软态. 采用GRS 1915+105的最新动力学参数M=12.4+2.01.8 M, i=60±5, D=8.6+2.01.6kpc (M、M、i和D分别表示黑洞质量、太阳质量、盘倾角和距离), 得到其无量纲黑洞自旋a的一个下限a>0.9990, 确认了GRS 1915+105是一个具有极端自旋的黑洞. 考虑本地吸收体的作用, 在模型中加入了吸收成分``tbpcf' (表示一个被部分遮蔽的吸收成分模型), 其等效氢柱密度高达1023cm-2, 与``康普顿厚"的特征一致.

    Abstract:

    GRS 1915+105 is a galactic low-mass X-ray binary. Its energy spectra and black hole spin have been extensively studied. Since 2018 July, it has declined into a low-flux X-ray level, occasionally interrupted by multi-wavelength flares. Using the data of Insight-HXMT (Insight-Hard X-ray Modulation Telescope) satellite from August 30 to Oct 13, 2020, the energy spectra characteristics of GRS 1915+105 is investigated. The results show that the energy spectra can be well fitted with a Comptonized multi-temperature blackbody model. The evolution of the hardness-intensity diagram during the outburst remains in the soft state. Adopting new dynamical parameters of GRS 1915+105 (including the black hole mass M, the Sun mass M, the inclination angle i, and the distance d): M=12.4+2.01.8 M, i=60±5, D=8.6+2.01.6 kpc, the group obtains a lower limit of the black hole spin, a>0.9990, confirming that GRS 1915+105 is an extremely-spinning black hole. Considering the effects of a local absorber, the group adds the absorption component ``tbpcf' into the model. Its equivalent hydrogen column density reaches 1023 cm2, which is consistent with the characteristics of ``Compton-thick'.

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王苑,苟利军,赵雪杉,冯叶,贾楠,廖振玄,李玉丰. GRS 1915+105的X射线能谱分析及黑洞自旋测量[J].天文学报,2023,64(2):15. WANG Yuan, GOU Li-jun, ZHAO Xue-shan, FENG Ye, JIA Nan, LIAO Zhen-xuan, LI Yu-feng. X-ray Energy Spectra Study and Black Hole Spin Estimate of GRS 1915+105[J]. Acta Astronomica Sinica,2023,64(2):15.

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  • 收稿日期:2022-03-09
  • 在线发布日期: 2023-03-26