Journal Article

C-type shocks in the interstellar medium: profiles of CH<sup>+</sup> and CH absorption lines

D. R. Flower and G. Pineau des Forêts

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 297, issue 4, pages 1182-1188
Published in print July 1998 | ISSN: 0035-8711
Published online July 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1046/j.1365-8711.1998.01574.x
C-type shocks in the interstellar medium: profiles of CH+ and CH absorption lines

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We have computed optical absorption-line profiles of CH+ and CH, as predicted by a model of a C-type shock propagating in a diffuse interstellar cloud. Both these species are produced in the shock wave in the reaction sequence that is initiated by C+(H2, H)CH+. Whilst CH+ flows at the ion speed, CH, which forms in the dissociative recombination reaction CH+3(e, H2)CH, flows at a speed which is intermediate between those of the ions and the neutrals. The predicted velocity shift between the CH+ and CH line profiles is found to be no more than approximately 2 km s−1, which is smaller than has previously been assumed. We also investigate OH and HCO+, finding that the correlation between their column densities, recently observed in the diffuse interstellar medium, can be reproduced by the model.

Keywords: line: profiles; molecular data; shock waves; ISM: clouds

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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