{
  "id": "1002.3625",
  "version": "v1",
  "published": "2010-02-19T20:59:58.000Z",
  "updated": "2010-02-19T20:59:58.000Z",
  "title": "Chandra and Swift Follow-up Observations of the Intermediate Mass Black Hole in ESO243-49",
  "authors": [
    "N. A. Webb",
    "D. Barret",
    "O. Godet",
    "M. Servillat",
    "S. A. Farrell",
    "S. R. Oates"
  ],
  "comment": "10 pages, 3 figures, accepted for publication in ApJL on 12/02/2010",
  "journal": "2010, ApJ, 712, L107",
  "doi": "10.1088/2041-8205/712/1/L107",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "The brightest Ultra-Luminous X-ray source HLX-1 in the galaxy ESO 243-49 provides strong evidence for the existence of intermediate mass black holes. As the luminosity and thus the mass estimate depend on the association of HLX-1 with ESO 243-49, it is essential to confirm its affiliation. This requires follow-up investigations at wavelengths other than X-rays, which in-turn needs an improved source position. To further reinforce the intermediate mass black hole identification, it is necessary to determine HLX-1's environment to establish whether it could potentially form and nourish a black hole at the luminosities observed. Using the High Resolution Camera onboard Chandra, we determine a source position of RA=01h10m28.3s and Dec=-46d04'22.3\". A conservative 95% error of 0.3\" was found following a boresight correction by cross-matching the positions of 3 X-ray sources in the field with the 2MASS catalog. Combining all Swift UV/Optical Telescope uvw2 images, we failed to detect a UV source at the Chandra position down to a 3sigma limiting magnitude of 20.25 mag. However, there is evidence that the UV emission is elongated in the direction of HLX-1. This is supported by archival data from GALEX and suggests that the far-UV emission is stronger than the near-UV. This could imply that HLX-1 may be situated near the edge of a star forming region. Using the latest X-ray observations we deduce the mass accretion rate of a 500 Msun black hole with the observed luminosity and show that this is compatible with such an environment.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-02-19T20:59:58.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "intermediate mass black hole",
      "swift follow-up observations",
      "mass black hole identification",
      "uv/optical telescope uvw2 images",
      "high resolution camera onboard chandra"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "The Astrophysical Journal",
      "year": 2010,
      "month": "Mar",
      "volume": 712,
      "number": 1
    },
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 846213,
      "adsabs": "2010ApJ...712L.107W"
    }
  }
}