{
  "id": "1007.2550",
  "version": "v1",
  "published": "2010-07-15T13:11:46.000Z",
  "updated": "2010-07-15T13:11:46.000Z",
  "title": "Nitrogen hydrides in interstellar gas: Herschel/HIFI observations towards G10.6-0.4 (W31C)",
  "authors": [
    "C. M. Persson",
    "J. H. Black",
    "J. Cernicharo",
    "J. R. Goicoechea",
    "G. E. Hassel",
    "E. Herbst",
    "M. Gerin",
    "M. De Luca",
    "T. A. Bell",
    "A. Coutens",
    "E. Falgarone",
    "P. F. Goldsmith",
    "H. Gupta",
    "M. Kazmierczak",
    "D. C. Lis",
    "B. Mookerjea",
    "D. A. Neufeld",
    "J. Pearson",
    "T. G. Phillips",
    "P. Sonnentrucker",
    "J. Stutzki",
    "C. Vastel",
    "S. Yu",
    "F. Boulanger",
    "E. Dartois",
    "P. Encrenaz",
    "T. R. Geballe",
    "T. Giesen",
    "B. Godard",
    "C. Gry",
    "P. Hennebelle",
    "P. Hily-Blant",
    "C. Joblin",
    "R. Kolos",
    "J. Krelowski",
    "J. Martin-Pintado",
    "K. Menten",
    "R. Monje",
    "M. Perault",
    "R. Plume",
    "M. Salez",
    "S. Schlemmer",
    "M. Schmidt",
    "D. Teyssier",
    "I. Peron",
    "P. Cais",
    "P. Gaufre",
    "A. Cros",
    "L. Ravera",
    "P. Morris",
    "S. Lord",
    "P. Planesas"
  ],
  "comment": "5 pages, 3 figures, 2 online pages with 2 figures. Accepted for publication in A&A July 6 (Herschel/HIFI special issue)",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "The HIFI instrument on board the Herschel Space Observatory has been used to observe interstellar nitrogen hydrides along the sight-line towards G10.6-0.4 in order to improve our understanding of the interstellar chemistry of nitrogen. We report observations of absorption in NH N=1-0, J=2-1 and ortho-NH2 1_1,1-0_0,0. We also observed ortho-NH3 1_0-0_0, and 2_0-1_0, para-NH3 2_1-1_1, and searched unsuccessfully for NH+. All detections show emission and absorption associated directly with the hot-core source itself as well as absorption by foreground material over a wide range of velocities. All spectra show similar, non-saturated, absorption features, which we attribute to diffuse molecular gas. Total column densities over the velocity range 11-54 km/s are estimated. The similar profiles suggest fairly uniform abundances relative to hydrogen, approximately 6*10^-9, 3*10^-9, and 3*10^-9 for NH, NH2, and NH3, respectively. These abundances are discussed with reference to models of gas-phase and surface chemistry.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-07-15T13:11:46.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "interstellar gas",
      "herschel/hifi observations",
      "absorption",
      "total column densities",
      "interstellar nitrogen hydrides"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1051/0004-6361/201015105",
      "journal": "Astronomy and Astrophysics",
      "year": 2010,
      "month": "Oct",
      "volume": 521
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 861374,
      "adsabs": "2010A&A...521L..45P"
    }
  }
}