Falgarone, E., Godard, B., Cernicharo, J., De Luca, M., Gerin, M., Phillips, T. G., Black, J. H., Lis, D. C., Bell, T. A., Boulanger, F., Coutens, A., Dartois, E., Encrenaz, P., Giesen, T., Goicoechea, J. R., Goldsmith, P. F., Gupta, H., Gry, C., Hennebelle, P., Herbst, E., Hily-Blant, P., Joblin, C., Kazmierczak, M., Kolos, R., Krelowski, J., Martin-Pintado, J., Monje, R., Mookerjea, B., Neufeld, D. A., Perault, M., Pearson, J. C., Persson, C., Plume, R., Salez, M., Schmidt, M., Sonnentrucker, P., Stutzki, J., Teyssier, D., Vastel, C., Yu, S., Menten, K., Geballe, T. R., Schlemmer, S., Shipman, R., Tielens, A. G. G. M., Philipp, S., Cros, A., Zmuidzinas, J., Samoska, L. A., Klein, K., Lorenzani, A., Szczerba, R. ORCID: 0000-0003-2886-4460, Peron, I., Cais, P., Gaufre, P., Cros, A., Ravera, L., Morris, P., Lord, S. and Planesas, P. (2010). CH+(1-0) and (CH+)-C-13(1-0) absorption lines in the direction of massive star-forming regions. 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 rotational transition of the methylidyne cation CH+ and its isotopologue (CH+)-C-13 toward the remote massive star-forming regions W33A, W49N, and W51 with the HIFI instrument onboard the Herschel satellite. Both lines are seen only in absorption against the dust continuum emission of the star-forming regions. The CH+ absorption is saturated over almost the entire velocity ranges sampled by the lines-of-sight that include gas associated with the star-forming regions (SFR) and Galactic foreground material. The CH+ column densities are inferred from the optically thin components. A lower limit of the isotopic ratio [(CH+)-C-12]/[(CH+)-C-13]> 35.5 is derived from the absorptions of foreground material toward W49N. The column density ratio, N(CH+)/N(HCO+), is found to vary by at least a factor 10, between 4 and > 40, in the Galactic foreground material. Line-of-sight 12CH+ average abundances relative to total hydrogen are estimated. Their average value, N(CH+)/NH > 2.6 x 10(-8), is higher than that observed in the solar neighborhood and confirms the high abundances of CH+ in the Galactic interstellar medium. We compare this result to the predictions of turbulent dissipation regions (TDR) models and find that these high abundances can be reproduced for the inner Galaxy conditions. It is remarkable that the range of predicted N(CH+)/ N(HCO+) ratios, from 1 to similar to 50, is comparable to that observed.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Falgarone, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Godard, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cernicharo, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
De Luca, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gerin, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Phillips, T. G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Black, J. H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lis, D. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bell, T. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Boulanger, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Coutens, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dartois, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Encrenaz, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Giesen, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goicoechea, J. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goldsmith, P. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gupta, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gry, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hennebelle, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Herbst, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hily-Blant, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Joblin, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kazmierczak, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kolos, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Krelowski, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Martin-Pintado, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Monje, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mookerjea, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Neufeld, D. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Perault, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pearson, J. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Persson, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Plume, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Salez, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schmidt, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sonnentrucker, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stutzki, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Teyssier, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vastel, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yu, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Menten, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Geballe, T. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schlemmer, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shipman, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tielens, A. G. G. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Philipp, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cros, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zmuidzinas, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Samoska, L. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klein, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lorenzani, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Szczerba, R.UNSPECIFIEDorcid.org/0000-0003-2886-4460UNSPECIFIED
Peron, I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cais, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gaufre, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cros, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ravera, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Morris, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lord, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Planesas, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-494806
DOI: 10.1051/0004-6361/201015109
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
DIFFUSE INTERSTELLAR-MEDIUM; G10.6-0.4 W31C; CH ABSORPTION; J=1-0; HERSCHEL/HIFI; CHEMISTRY; HYDROGEN; CLOUDS; TRANSITIONS; INSTRUMENTMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/49480

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