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

Ji-Feng Liu (), Joel N. Bregman, Yu Bai, Stephen Justham and Paul Crowther
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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

Nature, 2013, vol. 503, issue 7477, 500-503

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.

Date: 2013
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DOI: 10.1038/nature12762

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