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  • Sonnentrucker, P.Johns Hopkins University (author)

Detection of hydrogen fluoride absorption in diffuse molecular clouds with Herschel/HIFI: an ubiquitous tracer of molecular gas

  • Article/chapterEnglish2010

Publisher, publication year, extent ...

  • 2010-10-01
  • EDP Sciences,2010
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:fac96824-3166-481c-abd5-c64f4bfe40b6
  • https://doi.org/10.1051/0004-6361/201015082DOI
  • https://research.chalmers.se/publication/131845URI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • We discuss the detection of absorption by interstellar hydrogen fluoride (HF) along the sight line to the submillimeter continuum sources W49N and W51. We have used Herschel's HIFI instrument in dual beam switch mode to observe the 1232.4762 GHz J = 1-0 HF transition in the upper sideband of the band 5a receiver. We detected foreground absorption by HF toward both sources over a wide range of velocities. Optically thin absorption components were detected on both sight lines, allowing us to measure - as opposed to obtain a lower limit on - the column density of HF for the first time. As in previous observations of HF toward the source G10.6-0.4, the derived HF column density is typically comparable to that of water vapor, even though the elemental abundance of oxygen is greater than that of fluorine by four orders of magnitude. We used the rather uncertain N(CH) - N(H-2) relationship derived previously toward diffuse molecular clouds to infer the molecular hydrogen column density in the clouds exhibiting HF absorption. Within the uncertainties, we find that the abundance of HF with respect to H-2 is consistent with the theoretical prediction that HF is the main reservoir of gas-phase fluorine for these clouds. Thus, hydrogen fluoride has the potential to become an excellent tracer of molecular hydrogen, and provides a sensitive probe of clouds of small H-2 column density. Indeed, the observations of hydrogen fluoride reported here reveal the presence of a low column density diffuse molecular cloud along the W51 sight line, at an LSR velocity of similar to 24 km s(-1), that had not been identified in molecular absorption line studies prior to the launch of Herschel.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Neufeld, D. A.Johns Hopkins University (author)
  • Phillips, T. G.California Institute of Technology (Caltech) (author)
  • Gerin, M.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
  • Lis, D. C.California Institute of Technology (Caltech) (author)
  • de Luca, M.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
  • Goicoechea, J. R.Centro de Astrobiologia (CAB) (author)
  • Black, John H,1949Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jblack (author)
  • Bell, T. A.California Institute of Technology (Caltech) (author)
  • Boulanger, F.Institut d'Astrophysique Spatiale (author)
  • Cernicharo, J.Centro de Astrobiologia (CAB) (author)
  • Coutens, A.Université de Toulouse,University of Toulouse (author)
  • Dartois, E.Institut d'Astrophysique Spatiale (author)
  • Kazmierczak, M.Uniwersytet Mikolaja Kopernika w Toruniu,Nicolaus Copernicus University (author)
  • Encrenaz, P.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
  • Falgarone, E.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
  • Geballe, T. R.Gemini Observatory North (author)
  • Giesen, T.Universität zu Köln,University of Cologne (author)
  • Godard, B.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
  • Goldsmith, P. F. (author)
  • Gry, C.Laboratoire d'Astrophysique de Marseille (author)
  • Gupta, H. (author)
  • Hennebelle, P.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
  • Herbst, E.Ohio State University (author)
  • Hily-Blant, P. (author)
  • Joblin, C.Université de Toulouse,University of Toulouse (author)
  • Kolos, R.Polish Academy of Sciences (author)
  • Krelowski, J.Uniwersytet Mikolaja Kopernika w Toruniu,Nicolaus Copernicus University (author)
  • Martin-Pintado, J.Centro de Astrobiologia (CAB) (author)
  • Menten, K. M.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Monje, Raquel,1979California Institute of Technology (Caltech)(Swepub:cth)em1raque (author)
  • Mookerjea, B.Tata Institute of Fundamental Research (author)
  • Pearson, J. C. (author)
  • Perault, M.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
  • Persson, Carina,1964Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)carina64 (author)
  • Plume, R.University of Calgary (author)
  • Salez, M.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
  • Schlemmer, S.Universität zu Köln,University of Cologne (author)
  • Schmidt, M.Polish Academy of Sciences (author)
  • Stutzki, J.Universität zu Köln,University of Cologne (author)
  • Teyssier, D.European Space Astronomy Centre (ESAC) (author)
  • Vastel, C.Université de Toulouse,University of Toulouse (author)
  • Yu, S. (author)
  • Caux, E.Université de Toulouse,University of Toulouse (author)
  • Güsten, R.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Hatch, W. A. (author)
  • Klein, T.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Mehdi, Imran (author)
  • Morris, P.California Institute of Technology (Caltech) (author)
  • Ward, J. S. (author)
  • Johns Hopkins UniversityCalifornia Institute of Technology (Caltech) (creator_code:org_t)

Related titles

  • In:Astronomy and Astrophysics: EDP Sciences521:1, s. Article Number: L12-0004-63611432-0746

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