{
  "id": "1101.0414",
  "version": "v2",
  "published": "2011-01-02T16:30:54.000Z",
  "updated": "2011-02-03T14:51:45.000Z",
  "title": "The Long-term Variability of the X-ray Sources in M82",
  "authors": [
    "Yi-Kuan Chiang",
    "Albert K. H. Kong"
  ],
  "comment": "Accepted for publication in MNRAS",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We investigate the long-term variability exhibited by the X-ray point sources in the starburst galaxy M82. By combining 9 Chandra observations taken between 1999 and 2007, we detect 58 X-ray point sources within the D25 isophote of M82 down to a luminosity of ~ 10^37 ergs/s. Of these 58 sources, we identify 3 supernova remnant candidates and one supersoft source. Twenty-six sources in M82 exhibit long-term (i.e., days to years) flux variability and 3 show long-term spectral variability. Furthermore, we classify 26 sources as variables and 10 as persistent sources. Among the total 26 variables, 17 varied by a flux ratio of > 3 and 6 are transient candidates. By comparing with other nearby galaxies, M82 shows extremely strong long-term X-ray variability that 47% of the X-ray sources are variables with a flux ratio of > 3. The strong X-ray variability of M82 suggests that the population is dominated by X-ray binaries.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2011-02-03T14:51:45.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "x-ray sources",
      "long-term variability",
      "x-ray point sources",
      "extremely strong long-term x-ray variability",
      "flux ratio"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1111/j.1365-2966.2011.18466.x",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2011,
      "month": "Jun",
      "volume": 414,
      "number": 2,
      "pages": 1329
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 883232,
      "adsabs": "2011MNRAS.414.1329C"
    }
  }
}