Cygnus X-1 contains a 21–solar mass black hole—Implications for massive star winds

@article{MillerJones2021CygnusXC,
  title={Cygnus X-1 contains a 21–solar mass black hole—Implications for massive star winds},
  author={James C. A. Miller-Jones and Arash Bahramian and Jerome A. Orosz and Ilya Mandel and Lijun Gou and Thomas J. Maccarone and Coenraad J. Neijssel and Xueshan Zhao and Jan M. Ziolkowski and Mark J. Reid and Phil Uttley and Xueying Zheng and Do-young Byun and Richard Dodson and Victoria Grinberg and Taehyun Jung and Jeong-Sook Kim and Benito Marcote and Sera B. Markoff and Mar{\'i}a J. Rioja and Anthony P. Rushton and David M. Russell and Gregory R. Sivakoff and Alexandra J. Tetarenko and Valeriu Tudose and Joern Wilms},
  journal={Science},
  year={2021},
  volume={371},
  pages={1046 - 1049}
}
A heavy black hole in an x-ray binary If a black hole interacts with a binary companion star, the system emits x-rays and can form a radio jet. The masses of black holes in these x-ray binaries are all lower than those detected using gravitational waves, challenging models of black hole formation from massive stars. Miller-Jones et al. used radio astrometry to refine the distance to Cygnus X-1, a well-studied x-ray binary. They found a larger distance than previous estimates, raising the mass… 

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