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A wide star-black-hole binary system from radial-velocity measurements

机译：通过径向速度测量获得的宽星黑洞双星系统

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摘要

All stellar-mass black holes have hitherto been identified by X-rays emitted from gas that is accreting onto the black hole from a companion star. These systems are all binaries with a black-hole mass that is less than 30 times that of the Sun(1-4). Theory predicts, however, that X-ray-emitting systems form a minority of the total population of star-black-hole binaries(5,6). When the black hole is not accreting gas, it can be found through radial-velocity measurements of the motion of the companion star. Here we report radial-velocity measurements taken over two years of the Galactic B-type star, LB-1. We find that the motion of the B star and an accompanying Ha emission line require the presence of a dark companion with a mass of 68(+11)(-13) solar masses, which can only be a black hole. The long orbital period of 78.9 days shows that this is a wide binary system. Gravitational-wave experiments have detected black holes of similar mass, but the formation of such massive ones in a high-metallicity environment would be extremely challenging within current stellar evolution theories.
机译：迄今为止，所有恒星质量的黑洞都由伴随同伴恒星吸积到黑洞的气体发出的X射线所识别。这些系统都是二进制文件，其黑洞质量小于太阳（1-4）质量的30倍。然而，理论预测，X射线发射系统仅占星黑洞双星总数的一小部分（5,6）。当黑洞不吸收气体时，可以通过对伴星的运动进行径向速度测量来发现黑洞。在这里，我们报告了银河B型恒星LB-1进行了两年的径向速度测量。我们发现，B星的运动和伴随的Ha发射线需要存在质量为68（+11）（-13）太阳质量的暗伴星，这只能是一个黑洞。 78.9天的长轨道周期表明，这是一个宽二进制系统。引力波实验已经检测到质量相似的黑洞，但是在目前的恒星演化理论中，在高金属性环境中形成如此巨大的黑洞将极具挑战性。

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  • 来源
    《Nature》 |2019年第7784期|618-621|共4页
  • 作者

    Liu Jifeng; Zhang Haotong; Howard Andrew W.; Bai Zhongrui; Lu Youjun; Soria Roberto; Justham Stephen; Li Xiangdong; Zheng Zheng; Wang Tinggui; Belczynski Krzysztof; Casares Jorge; Zhang Wei; Yuan Hailong; Dong Yiqiao; Lei Yajuan; Isaacson Howard; Wang Song; Bai Yu; Shao Yong; Gao Qing; Wang Yilun; Niu Zexi; Cui Kaiming; Zheng Chuanjie; Mu Xiaoyong; Zhang Lan; Wang Wei; Heger Alexander; Qi Zhaoxiang; Liao Shilong; Lattanzi Mario; Gu Wei-Min; Wang Junfeng; Wu Jianfeng; Shao Lijing; Shen Rongfeng; Wang Xiaofeng; Bregman Joel; Di Stefano Rosanne; Liu Qingzhong; Han Zhanwen; Zhang Tianmeng; Wang Huijuan; Ren Juanjuan; Zhang Junbo; Zhang Jujia; Wang Xiaoli; Cabrera-Lavers Antonio; Corradi Romano; Rebolo Rafael; Zhao Yongheng; Zhao Gang; Chu Yaoquan; Cui Xiangqun;

  • 作者单位

    Chinese Acad Sci Key Lab Opt Astron Natl Astron Observ Beijing Peoples R China|Univ Chinese Acad Sci Sch Astron & Space Sci Beijing Peoples R China|Wuhan Univ WHU NAOC Joint Ctr Astron Wuhan Hubei Peoples R China;

    Chinese Acad Sci Key Lab Opt Astron Natl Astron Observ Beijing Peoples R China;

    CALTECH Dept Astron Pasadena CA 91125 USA;

    Chinese Acad Sci Key Lab Opt Astron Natl Astron Observ Beijing Peoples R China|Univ Chinese Acad Sci Sch Astron & Space Sci Beijing Peoples R China;

    Univ Chinese Acad Sci Sch Astron & Space Sci Beijing Peoples R China|Univ Sydney Sydney Inst Astron Sydney NSW Australia;

    Chinese Acad Sci Key Lab Opt Astron Natl Astron Observ Beijing Peoples R China|Univ Chinese Acad Sci Sch Astron & Space Sci Beijing Peoples R China|Univ Amsterdam Astron Inst Anton Pannekoek Amsterdam Netherlands;

    Nanjing Univ Sch Astron & Space Sci Nanjing Jiangsu Peoples R China|Nanjing Univ Key Lab Modern Astron & Astrophys Minist Educ Nanjing Jiangsu Peoples R China;

    Univ Utah Dept Phys & Astron Salt Lake City UT USA;

    Univ Sci & Technol China Dept Astron CAS Key Lab Res Galaxies & Cosmol Hefei Anhui Peoples R China;

    Polish Acad Sci Nicolaus Copernicus Astron Ctr Warsaw Poland;

    Inst Astrofis Canarias San Cristobal la Laguna Spain|Univ La Laguna Dept Astrofis Santa Cruz De Tenerife Spain;

    Univ Calif Berkeley Dept Astron 601 Campbell Hall Berkeley CA 94720 USA;

    Univ Chinese Acad Sci Sch Astron & Space Sci Beijing Peoples R China;

    Wuhan Univ WHU NAOC Joint Ctr Astron Wuhan Hubei Peoples R China|Wuhan Univ Sch Phys & Technol Wuhan Hubei Peoples R China;

    Monash Univ Sch Phys & Astron Monash Ctr Astrophys Clayton Vic Australia;

    Chinese Acad Sci Key Lab Opt Astron Natl Astron Observ Beijing Peoples R China|Chinese Acad Sci Shanghai Astron Observ Shanghai Peoples R China;

    Chinese Acad Sci Shanghai Astron Observ Shanghai Peoples R China;

    INAF Osservatorio Astrofis Torino Pino Torinese Italy;

    Xiamen Univ Dept Astron Xiamen Fujian Peoples R China;

    Peking Univ Kavli Inst Astron & Astrophys Beijing Peoples R China;

    Sun Yat Sen Univ Sch Phys & Astron Zhuhai Peoples R China;

    Tsinghua Univ Dept Phys Beijing Peoples R China|Tsinghua Univ Tsinghua Ctr Astrophys Beijing Peoples R China;

    Univ Michigan Dept Astron Ann Arbor MI 48109 USA;

    Harvard Smithsonian Ctr Astrophys 60 Garden St Cambridge MA 02138 USA;

    Chinese Acad Sci Key Lab Dark Matter & Space Astron Purple Mt Observ Nanjing Jiangsu Peoples R China;

    Chinese Acad Sci Key Lab Struct & Evolut Celestial Objects Yunnan Observ Kunming Yunnan Peoples R China;

    Inst Astrofis Canarias San Cristobal la Laguna Spain|GRANTECAN Brena Baja Spain;

    Univ La Laguna Dept Astrofis Santa Cruz De Tenerife Spain|GRANTECAN Brena Baja Spain;

    Chinese Acad Sci Nanjing Inst Astron Opt & Technol Nanjing Jiangsu Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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