{
  "id": "1501.05048",
  "version": "v1",
  "published": "2015-01-21T04:16:25.000Z",
  "updated": "2015-01-21T04:16:25.000Z",
  "title": "\"Dust, Ice, and Gas In Time\" (DIGIT) Herschel Observations of GSS30-IRS1 in Ophiuchus",
  "authors": [
    "Hyerin Je",
    "Jeong-Eun Lee",
    "Seokho Lee",
    "Joel D. Green",
    "Neal J. Evans II"
  ],
  "comment": "63 pages, 25 figures, accepted for publication in ApJS",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "As a part of the \"Dust, Ice, and Gas In Time\" (DIGIT) key program on Herschel, we observed GSS30-IRS1, a Class I protostar located in Ophiuchus (d = 120 pc), with Herschel/Photodetector Array Camera and Spectrometer (PACS). More than 70 lines were detected within a wavelength range from 50 micron to 200 micron, including CO, H2O, OH, and two atomic [O I] lines at 63 and 145 micron. The [C II] line, known as a tracer of externally heated gas by the interstellar radiation field, is also detected at 158 micron. All lines, except [O I] and [C II], are detected only at the central spaxel of 9.4\" X 9.4\". The [O I] emissions are extended along a NE-SW orientation, and the [C II] line is detected over all spaxels, indicative of external PDR. The total [C II] intensity around GSS30 reveals that the far-ultraviolet radiation field is in the range of 3 to 20 G0, where G0 is in units of the Habing Field, 1.6 X 10^{-3} erg cm^{-2} s^{-1}. This enhanced external radiation field heats the envelope of GSS30-IRS1, causing the continuum emission to be extended, unlike the molecular emission. The best-fit continuum model of GSS30-IRS1 with the physical structure including flared disk, envelope, and outflow shows that the internal luminosity is 10 Lsun, and the region is externally heated by a radiation field enhanced by a factor of 130 compared to the standard local interstellar radiation field.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-01-21T04:16:25.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "herschel observations",
      "gss30-irs1",
      "standard local interstellar radiation field",
      "enhanced external radiation field heats"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 63,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}