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

Author

Listed:
  • Ji-Feng Liu

    (Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, 100012 Beijing, China)

  • Joel N. Bregman

    (University of Michigan, 500 Church Street, Ann Arbor, Michigan 40185, USA)

  • Yu Bai

    (Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, 100012 Beijing, China)

  • Stephen Justham

    (Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, 100012 Beijing, China)

  • Paul Crowther

    (University of Sheffield, Hounsfield Road, Sheffield S3 7RH, UK)

Abstract

The ultraluminous X-ray source M 101 ULX-1 consists of a black hole orbiting a Wolf-Rayet star; optical spectroscopy now shows that the orbital period is 8.2 days, suggesting that the black hole has a mass in the range 5 to 30 solar masses, though the X-ray spectra are unlike what is expected from accretion onto a stellar-mass black hole—accretion must occur from captured stellar wind, which has hitherto been thought to be so inefficient that it could not power an ultraluminous source.

Suggested Citation

  • Ji-Feng Liu & Joel N. Bregman & Yu Bai & Stephen Justham & Paul Crowther, 2013. "Puzzling accretion onto a black hole in the ultraluminous X-ray source M 101 ULX-1," Nature, Nature, vol. 503(7477), pages 500-503, November.
    • Handle: RePEc:nat:nature:v:503:y:2013:i:7477:d:10.1038_nature12762
    DOI: 10.1038/nature12762
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