{
  "id": "0905.4297",
  "version": "v1",
  "published": "2009-05-26T23:51:46.000Z",
  "updated": "2009-05-26T23:51:46.000Z",
  "title": "Spatial variations of dust abundances across the Large Magellanic Cloud",
  "authors": [
    "Deborah Paradis",
    "William T. Reach",
    "Jean-Philippe Bernard",
    "Miwa Block",
    "Chad W. Engelbracht",
    "Karl Gordon",
    "Joseph L. Hora",
    "Remy Indebetouw",
    "Akiko Kawamura",
    "Marilyn Meade",
    "Margaret Meixner",
    "Marta Sewilo",
    "Uma P. Vijh",
    "Kevin Volk"
  ],
  "comment": "Received 2009 February 13; Accepted 2009 April 28",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "Using the data obtained with the Spitzer Space telescope as part of the Surveying the Agents of a Galaxy's Evolution (SAGE) legacy survey, we have studied the variations of the dust composition and abundance across the Large Magellanic Cloud (LMC). Such variations are expected, as the explosive events which have lead to the formation of the many HI shells observed should have affected the dust properties. Using a model and comparing with a reference spectral energy distribution from our Galaxy, we deduce the relative abundance variations of small dust grains across the LMC. We examined the infrared color ratios as well as the relative abundances of very small grains (VSGs) and polycyclic aromatic hydrocarbons (PAHs) relative to the big grain (BG) abundance. Results show that each dust component could have different origins or evolution in the interstellar medium (ISM). The VSG abundance traces the star formation activity and could result from shattering of larger grains, whereas the PAH abundance increases around molecular clouds as well as in the stellar bar, where they could have been injected into the ISM during mass loss from old stars.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-05-26T23:51:46.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "large magellanic cloud",
      "dust abundances",
      "spatial variations",
      "reference spectral energy distribution",
      "vsg abundance traces"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-6256/138/1/196",
      "journal": "The Astronomical Journal",
      "year": 2009,
      "month": "Jul",
      "volume": 138,
      "number": 1,
      "pages": 196
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 821396,
      "adsabs": "2009AJ....138..196P"
    }
  }
}