{
  "id": "1209.2780",
  "version": "v2",
  "published": "2012-09-13T04:59:55.000Z",
  "updated": "2013-08-13T20:19:36.000Z",
  "title": "XMM-Newton discovery of transient 285.4 s X-ray pulsar XMMU J013359.5+303634 in M33",
  "authors": [
    "Sergey Trudolyubov"
  ],
  "comment": "7 pages, 6 figures. Accepted for publication in MNRAS. Updated to match the accepted version",
  "categories": [
    "astro-ph.HE",
    "astro-ph.GA",
    "astro-ph.SR"
  ],
  "abstract": "I report on the discovery and analysis of the first transient X-ray pulsar detected in the Local Group galaxy M33. The 2010 July-August deep XMM-Newton observations of M33 fields revealed a new bright X-ray source XMMU J013359.5+303634 exhibiting pulsations with a period P~285.4 s and pulsed fraction ~47 per cent in the 0.3-10 keV energy range. The pulse phase averaged spectrum of XMMU J013359.5+303634 is typical of X-ray pulsars and can be fit with an absorbed simple power law model of photon index Gamma~1.2 in the 0.3-10 keV energy band. The search for an optical counterpart did not yield any stellar object brighter than 20 mag, suggesting that XMMU J013359.5+303634 is not a Galactic foreground object and almost certainly belongs to M33. Assuming the distance of 817 kpc, the maximum observed luminosity of the source in the 0.3-10 keV energy range is ~1.4e37 ergs/s, at least 20 times higher than quiescent luminosity. The brightest optical object inside the error circle of XMMU J013359.5+303634 has a visual magnitude of 20.9 and properties consistent with being an early B V star when placed at a distance of M33. Based on the X-ray pulsations and spectrum, transient behavior and possible early B class optical counterpart, XMMU J013359.5+303634 can be classified as another extragalactic Be/X-ray binary candidate.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2013-08-13T20:19:36.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "x-ray pulsar xmmu",
      "xmm-newton discovery",
      "transient x-ray pulsar",
      "kev energy range",
      "absorbed simple power law model"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/mnras/stt1518",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2013,
      "month": "Nov",
      "volume": 435,
      "number": 4,
      "pages": 3326
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1185359,
      "adsabs": "2013MNRAS.435.3326T"
    }
  }
}