Puzzling accretion onto a black hole in the ultraluminous X-ray source M 101 ULX-1

@article{Liu2013PuzzlingAO,
  title={Puzzling accretion onto a black hole in the ultraluminous X-ray source M 101 ULX-1},
  author={Jifeng Liu and Joel N. Bregman and Yu Bai and Stephen Justham and Paul A. Crowther},
  journal={Nature},
  year={2013},
  volume={503},
  pages={500-503}
}
There are two proposed explanations for ultraluminous X-ray sources (ULXs) with luminosities in excess of 1039 erg s−1. They could be intermediate-mass black holes (more than 100–1,000 solar masses, ) radiating at sub-maximal (sub-Eddington) rates, as in Galactic black-hole X-ray binaries but with larger, cooler accretion disks. Alternatively, they could be stellar-mass black holes radiating at Eddington or super-Eddington rates. On its discovery, M 101 ULX-1 had a luminosity of 3 × 1039 erg s… 
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