{
  "id": "1302.6616",
  "version": "v1",
  "published": "2013-02-26T22:31:39.000Z",
  "updated": "2013-02-26T22:31:39.000Z",
  "title": "Hydrogen chloride in diffuse interstellar clouds along the line of sight to W31C (G10.6-0.4)",
  "authors": [
    "R. R. Monje",
    "D. C. Lis",
    "E. Roueff",
    "M. Gerin",
    "M. De Luca",
    "D. A. Neufeld",
    "B. Godard",
    "T. G. Phillips"
  ],
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We report the detection of hydrogen chloride, HCl, in diffuse molecular clouds on the line of sight towards the star-forming region W31C (G10.6-0.4). The J = 1-0 lines of the two stable HCl isotopologues, H35Cl and H37Cl, are observed using the 1b receiver of the Heterodyne Instrument for the Far-Infrared (HIFI) aboard the Herschel Space Observatory. The HCl line is detected in absorption, over a wide range of velocities associated with di?use clouds along the line of sight to W31C. The analysis of the absorption strength yields a total HCl column density of few 10^13 cm^-2, implying that HCl accounts for ~0.6 % of the total gasphase chlorine, which exceeds by a factor of ~6 the theoretical model predictions. This result is comparable to those obtained from the chemically-related species H2Cl+ and HCl+, for which large column densities have also been reported on the same line of sight. The source of discrepancy between models and observations is still unknown; however, the detection of these Cl-bearing molecules, provides key constraints for the chlorine chemistry in the diffuse gas.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-02-26T22:31:39.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "diffuse interstellar clouds",
      "hydrogen chloride",
      "total hcl column density",
      "herschel space observatory",
      "diffuse molecular clouds"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/767/1/81",
      "journal": "The Astrophysical Journal",
      "year": 2013,
      "month": "Apr",
      "volume": 767,
      "number": 1,
      "pages": 81
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1221456,
      "adsabs": "2013ApJ...767...81M"
    }
  }
}