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

@article{Liu2019AWS,
title={A wide star–black-hole binary system from radial-velocity measurements},
author={Jifeng Liu and Haotong Zhang and Andrew W. Howard and Zhongrui Bai and Youjun Lu and Roberto Soria and Stephen Justham and Xiangdong Li and Zheng Zheng and Tinggui Wang and Krzysztof Belczyński and Jorge Casares and Wei Zhang and Hailong Yuan and Yi-Ze Dong and Yajuan Lei and Howard T. Isaacson and Song-Yun Wang and Yu Bai and Yong Shao and Qi Gao and Yilun Wang and Zexi Niu and Kai-Ming Cui and Chuanjie Zheng and Xiaoyong Mu and Lan Zhang and Wenping Wang and Alexander Heger and Zhao-xiang Qi and Shi-long Liao and Mario Gilberto Lattanzi and Wei-Min Gu and Junfeng Wang and Jianfeng Wu and Lijing Shao and Rongfeng Shen and Xiaofeng Wang and Joel N. Bregman and Rosanne Di Stefano and Qing-zhong Liu and Zhan-wen Han and Tian-meng Zhang and Huijuan Wang and Juan-juan Ren and Junbo Zhang and Jujia Zhang and Xiao-Li Wang and Antonio Cabrera-Lavers and Romano L. M. Corradi and Rafael Rebolo and Yongheng Zhao and Gang Zhao and Yao-quan Chu and Xiang-qun Cui},
journal={Nature},
year={2019},
volume={575},
pages={618 - 621}
}
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 Sun1–4. Theory predicts, however, that X-ray-emitting systems form a minority of the total population of star–black-hole binaries5,6. When the black hole is not accreting gas, it can be found through radial-velocity measurements of the motion of the companion… Expand
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