{
  "id": "1704.06671",
  "version": "v1",
  "published": "2017-04-21T18:21:41.000Z",
  "updated": "2017-04-21T18:21:41.000Z",
  "title": "Extreme CO Isotopic Abundances in the ULIRG IRAS 13120-5453: An Extremely Young Starburst or Top-Heavy Initial Mass Function",
  "authors": [
    "Kazimierz Sliwa",
    "Christine D. Wilson",
    "Susanne Aalto",
    "George C. Privon"
  ],
  "comment": "7 pages, 3 figures, accepted for publication in ApJL",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We present ALMA $^{12}$CO (J=1-0, 3-2 and 6-5), $^{13}$CO (J=1-0) and C$^{18}$O (J=1-0) observations of the local Ultra Luminous Infrared Galaxy, IRAS 13120-5453 (dubbed \"The Yo-yo\"). The morphologies of the three isotopic species differ, where $^{13}$CO shows a hole in emission towards the center. We measure integrated brightness temperature line ratios of $^{12}$CO/$^{13}$CO $\\geq$ 60 (exceeding 200) and $^{13}$CO/C$^{18}$O $\\leq$ 1 in the central region. Assuming optical thin emission, C$^{18}$O is more abundant than $^{13}$CO in several regions. The abundances within the central 500 pc are consistent with enrichment of the ISM via a young starburst ($<$7Myr), a top-heavy initial mass function or a combination of both.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-04-21T18:21:41.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "top-heavy initial mass function",
      "extremely young starburst",
      "brightness temperature line ratios",
      "ulirg iras",
      "isotopic abundances"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}