{
  "id": "astro-ph/9704262",
  "version": "v1",
  "published": "1997-04-27T16:10:20.000Z",
  "updated": "1997-04-27T16:10:20.000Z",
  "title": "Do the Broad Emission Line Clouds See the Same Continuum that We See?",
  "authors": [
    "Kirk Korista",
    "Gary Ferland",
    "Jack Baldwin"
  ],
  "comment": "11 pages AAS-LATeX aaspp4.sty format, including 1 figure; accepted for publication in ApJ",
  "doi": "10.1086/304659",
  "categories": [
    "astro-ph"
  ],
  "abstract": "Recent observations of quasars, Mrk 335 and the HST quasar composite spectrum, have indicated that many of them have remarkably soft ionizing continua (fnu ~ nu^-2.0, 13.6 eV -- 100 eV). We point out that the number of E > 54.4 eV photons is insufficient to create the observed strengths of the He II emission lines. While the numbers of photons which energize C IV 1549 and O VI 1034 are sufficient, even the most efficiently emitting clouds for these two lines must each cover at least 20% -- 40% of the source. If the typical quasar ionizing continuum is indeed this soft, then we must conclude that the broad emission line clouds must see a very different (harder) continuum than we see. The other viable possibility is that the UV -- EUV SED is double-peaked, with the second peaking near 54 eV, its Wien tail the observed soft X-ray excess.",
  "revisions": [
    {
      "version": "v1",
      "updated": "1997-04-27T16:10:20.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "broad emission line clouds",
      "hst quasar composite spectrum",
      "soft x-ray excess",
      "wien tail",
      "quasar ionizing continuum"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "LaTeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 461224
    }
  }
}