{
  "id": "1411.7212",
  "version": "v1",
  "published": "2014-11-26T12:58:22.000Z",
  "updated": "2014-11-26T12:58:22.000Z",
  "title": "The slim-disk state of the ultraluminous X-ray source in M83",
  "authors": [
    "Roberto Soria",
    "K. D. Kuntz",
    "Knox S. Long",
    "William P. Blair",
    "Paul P. Plucinsky",
    "P. Frank Winkler"
  ],
  "comment": "11 pages, accepted by the Astrophysical Journal",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "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 and the ultraluminous state, at X-ray luminosities $\\approx (1$-$3) \\times 10^{39}$ erg s$^{-1}$ (a factor of two lower than in the 2010-2011 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 black hole with $M \\sim$$10$-$20 M_{\\odot}$. We suggest that in the 2010-2011 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.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-11-26T12:58:22.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "ultraluminous x-ray source",
      "slim-disk state",
      "chandra observations",
      "galactic stellar-mass black holes",
      "ordinary stellar-mass black hole"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/799/2/140",
      "journal": "The Astrophysical Journal",
      "year": 2015,
      "month": "Feb",
      "volume": 799,
      "number": 2,
      "pages": 140
    },
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1330260,
      "adsabs": "2015ApJ...799..140S"
    }
  }
}