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Interstellar CH abs...
Interstellar CH absorption in the diffuse interstellar medium along the sight-lines to G10.6-0.4 (W31C), W49N, and W51
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- Gerin, M. (author)
- Ecole Normale Superieure (ENS)
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- de Luca, M. (author)
- Ecole Normale Superieure (ENS)
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- Goicoechea, J. R. (author)
- Centro de Astrobiologia (CAB)
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- Herbst, E. (author)
- Ohio State University
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- Falgarone, E. (author)
- Ecole Normale Superieure (ENS)
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- Godard, B. (author)
- Ecole Normale Superieure (ENS),Institut d'Astrophysique Spatiale
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- Bell, T. A. (author)
- California Institute of Technology (Caltech)
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- Coutens, A. (author)
- Centre national de la recherche scientifique (CNRS),Université de Toulouse,University of Toulouse
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- Kazmierczak, M. (author)
- Uniwersytet Mikolaja Kopernika w Toruniu,Nicolaus Copernicus University
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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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- Neufeld, D. A. (author)
- Johns Hopkins University
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- Phillips, T. G. (author)
- California Institute of Technology (Caltech)
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Pearson, J. C. (author)
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- Rimmer, P. B. (author)
- Ohio State University
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- Hassel, G.E. (author)
- Ohio State University
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- Lis, D. C. (author)
- California Institute of Technology (Caltech)
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- Vastel, C. (author)
- Université de Toulouse,University of Toulouse,Centre national de la recherche scientifique (CNRS)
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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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- Dartois, E. (author)
- Institut d'Astrophysique Spatiale
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- Encrenaz, P. (author)
- Ecole Normale Superieure (ENS)
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- Giesen, T. (author)
- Universität zu Köln,University of Cologne
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Goldsmith, P. F. (author)
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Gupta, H. (author)
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- Gry, C. (author)
- Laboratoire d'Astrophysique de Marseille
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- Hennebelle, P. (author)
- Ecole Normale Superieure (ENS)
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Hily-Blant, P. (author)
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- Joblin, C. (author)
- Université de Toulouse,University of Toulouse,Centre national de la recherche scientifique (CNRS)
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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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- 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)
- Ecole Normale Superieure (ENS)
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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)
- Ecole Normale Superieure (ENS)
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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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Yu, S. (author)
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- Contursi, A. (author)
- MPI fur Extraterrestrische Physik
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- Menten, K. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Geballe, T. R. (author)
- Gemini Observatory North
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- Schlemmer, S. (author)
- Universität zu Köln,University of Cologne
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- Morris, P. (author)
- California Institute of Technology (Caltech)
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Hatch, W. A. (author)
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Imram, M. (author)
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Ward, J. S. (author)
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- Caux, E. (author)
- Université de Toulouse,University of Toulouse,Centre national de la recherche scientifique (CNRS)
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- Güsten, R. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Klein, T. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Roelfsema, P. (author)
- Netherlands Institute for Space Research (SRON)
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- Dieleman, P. (author)
- Netherlands Institute for Space Research (SRON)
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- Schieder, R. (author)
- Universität zu Köln,University of Cologne
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- Honingh, N. (author)
- Universität zu Köln,University of Cologne
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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: L16-
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Abstract
Subject headings
Close
- We report the detection of the ground state N, J = 1, 3/2 -> 1, 1/2 doublet of the methylidyne radical CH at similar to 532 GHz and similar to 536 GHz with the Herschel/ HIFI instrument along the sight-line to the massive star-forming regions G10.6-0.4 (W31C), W49N, and W51. While the molecular cores associated with these massive star-forming regions show emission lines, clouds in the diffuse interstellar medium are detected in absorption against the strong submillimeter background. The combination of hyperfine structure with emission and absorption results in complex profiles, with overlap of the different hyperfine components. The opacities of most of the CH absorption features are linearly correlated with those of CCH, CN, and HCO+ in the same velocity intervals. In specific narrow velocity intervals, the opacities of CN and HCO+ deviate from the mean trends, giving rise to more opaque absorption features. We propose that CCH can be used as another tracer of the molecular gas in the absence of better tracers, with [CCH]/[H2] similar to 3.2 +/- 1.1 x 10-8. The observed [CN]/[CH], [CCH]/[CH] abundance ratios suggest that the bulk of the diffuse matter along the lines of sight has gas densities nH = n(H) + 2n(H2) ranging between 100 and 1000 cm-3).
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- ISM: individual
- molecular absorption
- cn
- ISM: individual objects: W49N
- submillimeter: ISM
- objects: W51
- objects: G10.6-0.4
- ISM: molecules
- ISM: individual
- clouds
- comparative chemistry
- h-2
- ISM: clouds
- star-forming regions
Publication and Content Type
- art (subject category)
- ref (subject category)
Find in a library
To the university's database
- By the author/editor
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Gerin, M.
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de Luca, M.
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Goicoechea, J. R ...
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Herbst, E.
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Falgarone, E.
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Godard, B.
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show more...
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Bell, T. A.
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Coutens, A.
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Kazmierczak, M.
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Sonnentrucker, P ...
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Black, John H, 1 ...
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Neufeld, D. A.
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Phillips, T. G.
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Pearson, J. C.
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Rimmer, P. B.
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Hassel, G.E.
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Lis, D. C.
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Vastel, C.
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Boulanger, F.
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Cernicharo, J.
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Dartois, E.
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Encrenaz, P.
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Giesen, T.
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Goldsmith, P. F.
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Gupta, H.
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Gry, C.
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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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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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Schmidt, M.
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Stutzki, J.
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Teyssier, D.
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Yu, S.
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Contursi, A.
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Menten, K.
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Geballe, T. R.
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Schlemmer, S.
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Morris, P.
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Hatch, W. A.
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Imram, M.
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Ward, J. S.
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Caux, E.
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Güsten, R.
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Klein, T.
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Roelfsema, P.
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Dieleman, P.
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Schieder, R.
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Honingh, N.
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Zmuidzinas, J.
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show less...
- About the subject
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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 ...
- Articles in the publication
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Astronomy and As ...
- By the university
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Chalmers University of Technology