{
  "id": "astro-ph/0105307",
  "version": "v1",
  "published": "2001-05-17T15:38:43.000Z",
  "updated": "2001-05-17T15:38:43.000Z",
  "title": "The identification of an optical counterpart to the super-Eddington X-ray source, NGC 5204 X-1",
  "authors": [
    "T. P. Roberts",
    "M. R. Goad",
    "M. J. Ward",
    "R. S. Warwick",
    "P. T. O'Brien",
    "P. Lira",
    "A. D. P. Hands"
  ],
  "comment": "5 pages including 4 figures; accepted for publication as a letter in MNRAS",
  "journal": "Mon.Not.Roy.Astron.Soc. 325 (2001) L7",
  "doi": "10.1046/j.1365-8711.2001.04659.x",
  "categories": [
    "astro-ph"
  ],
  "abstract": "We report the identification of a possible optical counterpart to the super-Eddington X-ray source NGC 5204 X-1. New Chandra data shows that the X-ray source is point-like, with a luminosity of 5.2 x 10^39 erg/s (0.5 - 8 keV). It displays medium- and long-term X-ray variability in observations spanning a period of 20 years. The accurate Chandra position allows us to identify a blue optical continuum source (m_v = 19.7) at the position of NGC 5204 X-1, using newly-obtained optical data from the INTEGRAL instrument on the William Herschel Telescope. The X-ray and optical source properties are consistent with the scenario in which we are observing the beamed X-ray emission of a high-mass X-ray binary in NGC 5204, composed of an O star with either a black hole or neutron star companion.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2001-05-17T15:38:43.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "optical counterpart",
      "identification",
      "super-eddington x-ray source ngc",
      "neutron star companion",
      "long-term x-ray variability"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 574953
    }
  }
}