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Herschel/HIFI obser...
Herschel/HIFI observations of interstellar OH+ and H2O+ towards W49N: a probe of diffuse clouds with a small molecular fraction
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- Neufeld, D. A. (author)
- Johns Hopkins University
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- Goicoechea, J. R. (author)
- Centro de Astrobiologia (CAB)
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- Sonnentrucker, P. (author)
- Johns Hopkins University
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- Black, John H, 1949 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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Pearson, J. C. (author)
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Yu, S. (author)
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- Phillips, T. G. (author)
- California Institute of Technology (Caltech)
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- Lis, D. C. (author)
- California Institute of Technology (Caltech)
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- de Luca, M. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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- Herbst, E. (author)
- Ohio State University
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- Rimmer, P. B. (author)
- Ohio State University
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- Gerin, M. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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- Bell, T. A. (author)
- California Institute of Technology (Caltech)
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- Boulanger, F. (author)
- Institut d'Astrophysique Spatiale
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- Cernicharo, J. (author)
- Centro de Astrobiologia (CAB)
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- Coutens, A. (author)
- Université de Toulouse,University of Toulouse
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- Dartois, E. (author)
- Institut d'Astrophysique Spatiale
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- Kazmierczak, M. (author)
- Uniwersytet Mikolaja Kopernika w Toruniu,Nicolaus Copernicus University
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- Encrenaz, P. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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- Falgarone, E. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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- Geballe, T. R. (author)
- Gemini Observatory North
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- Giesen, T. (author)
- Universität zu Köln,University of Cologne
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- Godard, B. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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Goldsmith, P. F. (author)
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- Gry, C. (author)
- Laboratoire d'Astrophysique de Marseille
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Gupta, H. (author)
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- Hennebelle, P. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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Hily-Blant, P. (author)
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- Joblin, C. (author)
- Université de Toulouse,University of Toulouse
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- Kolos, R. (author)
- Polish Academy of Sciences
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- Krelowski, J. (author)
- Uniwersytet Mikolaja Kopernika w Toruniu,Nicolaus Copernicus University
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- Martin-Pintado, J. (author)
- Centro de Astrobiologia (CAB)
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- Menten, K. M. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Monje, Raquel, 1979 (author)
- California Institute of Technology (Caltech)
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- Mookerjea, B. (author)
- Tata Institute of Fundamental Research
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- Perault, M. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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- Persson, Carina, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Plume, R. (author)
- University of Calgary
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- Salez, M. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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- Schlemmer, S. (author)
- Universität zu Köln,University of Cologne
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- Schmidt, M. (author)
- Polish Academy of Sciences
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- Stutzki, J. (author)
- Universität zu Köln,University of Cologne
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- Teyssier, D. (author)
- European Space Astronomy Centre (ESAC)
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- Vastel, C. (author)
- Université de Toulouse,University of Toulouse
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- Cros, A. (author)
- Université de Toulouse,University of Toulouse
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- Klein, K. (author)
- University of Waterloo
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- Lorenzani, A. (author)
- Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory
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- Philipp, S. (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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Samoska, A. (author)
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- Shipman, R. (author)
- Netherlands Institute for Space Research (SRON)
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- Tielens, Aggm (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Szczerba, R. (author)
- Polish Academy of Sciences
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- Zmuidzinas, J. (author)
- California Institute of Technology (Caltech)
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(creator_code:org_t)
- 2010-10-01
- 2010
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 521:1, s. Article Number: L10-
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Abstract
Subject headings
Close
- We report the detection of absorption by interstellar hydroxyl cations and water cations, along the sight-line to the bright continuum source W49N. We have used Herschel's HIFI instrument, in dual beam switch mode, to observe the 972 GHz N = 1-0 transition of OH+ and the 1115 GHz 1(11)-0(00) transition of ortho-H2O+. The resultant spectra show absorption by ortho-H2O+, and strong absorption by OH+, in foreground material at velocities in the range 0 to 70 km s(-1) with respect to the local standard of rest. The inferred OH+/H2O+ abundance ratio ranges from similar to 3 to similar to 15, implying that the observed OH+ arises in clouds of small molecular fraction, in the 2-8% range. This conclusion is confirmed by the distribution of OH+ and H2O+ in Doppler velocity space, which is similar to that of atomic hydrogen, as observed by means of 21 cm absorption measurements, and dissimilar from that typical of other molecular tracers. The observed OH+/H abundance ratio of a few x10(-8) suggests a cosmic ray ionization rate for atomic hydrogen of 0.6-2.4 x 10(-16) s(-1), in good agreement with estimates inferred previously for diffuse clouds in the Galactic disk from observations of interstellar H-3(+) and other species.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- model
- line
- astrochemistry
- laser magnetic-resonance
- cation
- gas
- star-forming regions
- ISM: molecules
- submillimeter: ISM
- h-3(+)
- molecular processes
- absorption
Publication and Content Type
- art (subject category)
- ref (subject category)
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To the university's database
- By the author/editor
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Neufeld, D. A.
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Goicoechea, J. R ...
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Sonnentrucker, P ...
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Black, John H, 1 ...
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Pearson, J. C.
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Yu, S.
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show more...
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Phillips, T. G.
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Lis, D. C.
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de Luca, M.
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Herbst, E.
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Rimmer, P. B.
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Gerin, M.
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Bell, T. A.
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Boulanger, F.
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Cernicharo, J.
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Coutens, A.
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Dartois, E.
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Kazmierczak, M.
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Encrenaz, P.
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Falgarone, E.
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Geballe, T. R.
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Giesen, T.
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Godard, B.
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Goldsmith, P. F.
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Gry, C.
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Gupta, H.
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Hennebelle, P.
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Hily-Blant, P.
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Joblin, C.
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Kolos, R.
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Krelowski, J.
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Martin-Pintado, ...
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Menten, K. M.
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Monje, Raquel, 1 ...
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Mookerjea, B.
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Perault, M.
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Persson, Carina, ...
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Plume, R.
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Salez, M.
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Schlemmer, S.
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Schmidt, M.
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Stutzki, J.
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Teyssier, D.
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Vastel, C.
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Cros, A.
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Klein, K.
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Lorenzani, A.
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Philipp, S.
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Samoska, A.
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Shipman, R.
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Tielens, Aggm
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Szczerba, R.
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Zmuidzinas, J.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Astronomy and As ...
- By the university
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Chalmers University of Technology