Gerin, M., De Luca, M., Goicoechea, J. R., Herbst, E., Falgarone, E., Godard, B., Bell, T. A., Coutens, A., Kazmierczak, M., Sonnentrucker, P., Black, J. H., Neufeld, D. A., Phillips, T. G., Pearson, J., Rimmer, P. B., Hassel, G., Lis, D. C., Vastel, C., Boulanger, F., Cernicharo, J., Dartois, E., Encrenaz, P., Giesen, T., Goldsmith, P. F., Gupta, H., Gry, C., Hennebelle, P., Hily-Blant, P., Joblin, C., Kolos, R., Krelowski, J., Martin-Pintado, J., Monje, R., Mookerjea, B., Perault, M., Persson, C., Plume, R., Salez, M., Schmidt, M., Stutzki, J., Teyssier, D., Yu, S., Contursi, A., Menten, K., Geballe, T. R., Schlemmer, S., Morris, P., Hatch, W. A., Imram, M., Ward, J. S., Caux, E., Guesten, R., Klein, T., Roelfsema, P., Dieleman, P., Schieder, R., Honingh, N. and Zmuidzinas, J. (2010). Interstellar CH absorption in the diffuse interstellar medium along the sight-lines to G10.6-0.4 (W31C), W49N, and W51. Astron. Astrophys., 521. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 0004-6361

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Abstract

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]/[H-2] 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(H-2) ranging between 100 and 1000 cm(-3).

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Gerin, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
De Luca, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goicoechea, J. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Herbst, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Falgarone, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Godard, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bell, T. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Coutens, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kazmierczak, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sonnentrucker, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Black, J. H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Neufeld, D. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Phillips, T. G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pearson, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rimmer, P. B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hassel, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lis, D. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vastel, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Boulanger, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cernicharo, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dartois, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Encrenaz, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Giesen, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goldsmith, P. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gupta, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gry, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hennebelle, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hily-Blant, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Joblin, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kolos, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Krelowski, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Martin-Pintado, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Monje, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mookerjea, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Perault, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Persson, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Plume, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Salez, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schmidt, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stutzki, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Teyssier, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yu, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Contursi, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Menten, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Geballe, T. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schlemmer, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Morris, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hatch, W. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Imram, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ward, J. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Caux, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guesten, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klein, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Roelfsema, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dieleman, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schieder, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Honingh, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zmuidzinas, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-494822
DOI: 10.1051/0004-6361/201015115
Journal or Publication Title: Astron. Astrophys.
Volume: 521
Date: 2010
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 0004-6361
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
STAR-FORMING REGIONS; MOLECULAR CLOUDS; HERSCHEL/HIFI OBSERVATIONS; COMPARATIVE CHEMISTRY; CN; H2O+; GAS; OH+; H-2Multiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/49482

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