{
  "id": "astro-ph/0211512",
  "version": "v1",
  "published": "2002-11-22T21:41:23.000Z",
  "updated": "2002-11-22T21:41:23.000Z",
  "title": "On the Origin of Nitrogen in Damped Ly-alpha Systems",
  "authors": [
    "R. B. C. Henry",
    "Jason X. Prochaska"
  ],
  "comment": "7 pages, in ``CNO in the Universe,'' ASP Conference Series, in press edited by C. Charbonnel, D. Schaerer, and G. Meynet",
  "categories": [
    "astro-ph"
  ],
  "abstract": "Recent measurements of nitrogen and alpha elements in over 20 damped Ly-alpha systems (DLA) are compared with similar measurements for numerous emission line objects and stars. It is found that the DLA distribution in the N/alpha-alpha/H plane is bimodal, where most sample DLAs fall along the N/alpha plateau defined at low Z by dwarf irregulars, while a small group possesses N/alpha values roughly 0.7 dex less than those on the plateau at similar alpha/H values. We demonstrate with chemical evolution models that a top-heavy or truncated IMF can account for the low N in this second group.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2002-11-22T21:41:23.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "damped ly-alpha systems",
      "small group possesses n/alpha values",
      "sample dlas fall",
      "emission line objects"
    ],
    "tags": [
      "conference paper"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 602894
    }
  }
}