A 15.65-solar-mass black hole in an eclipsing binary in the nearby spiral galaxy M 33

@article{Orosz2007A1B,
  title={A 15.65-solar-mass black hole in an eclipsing binary in the nearby spiral galaxy M 33},
  author={Jerome A. Orosz and Jeffrey E. McClintock and Ramesh Narayan and Charles D. Bailyn and Joel D. Hartman and Lucas M. Macri and Jiefeng Liu and Wolfgang Pietsch and Ronald A. Remillard and Avi Shporer and Tsevi Mazeh},
  journal={Nature},
  year={2007},
  volume={449},
  pages={872-875}
}
Stellar-mass black holes are found in X-ray-emitting binary systems, where their mass can be determined from the dynamics of their companion stars. Models of stellar evolution have difficulty producing black holes in close binaries with masses more than ten times that of the Sun (>10; ref. 4), which is consistent with the fact that the most massive stellar black holes known so far all have masses within one standard deviation of 10. Here we report a mass of (15.65 ± 1.45) for the black hole in… 
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