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The slim-disk state of the ultraluminous X-ray source in M83

Soria, Roberto ; Kuntz, K ; Long, K ; Blair, W ; Plucinsky, P ; Winkler, P

2015

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  • Title:
    The slim-disk state of the ultraluminous X-ray source in M83
  • Author: Soria, Roberto ; Kuntz, K ; Long, K ; Blair, W ; Plucinsky, P ; Winkler, P
  • Description: The transient ULX in M83 that went into outburst in, or shortly before, 2010 is still active. Our new XMM-Newton spectra show that it has a curved spectrum typical of the upper end of the high/soft state or slim-disk state. It appears to be spanning the gap between Galactic stellar-mass black holes (BHs) and the ultraluminous state, at X-ray luminosities of ≈1-3 × 1039 erg s–1 (a factor of two lower than in the 2010 and 2011 Chandra observations). From its broadened disk-like spectral shape at that luminosity, and from the fitted inner-disk radius and temperature, we argue that the accreting object is an ordinary stellar-mass BH with M ~ 10-20 M ☉. We suggest that in the 2010 and 2011 Chandra observations, the source was seen at a higher accretion rate, resulting in a power-law-dominated spectrum with a soft excess at large radii.
  • Publication Date: 2015
  • Publisher: Institute of Physics Publishing
  • Identifier: DOI: 10.1088/0004-637X/799/2/140
  • Language: English
  • Source: espace

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