Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.297.1182f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 297, Issue 4, pp. 1182-1188.
Astronomy and Astrophysics
Astronomy
49
Line: Profiles, Molecular Data, Shock Waves, Ism: Clouds
Scientific paper
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^+(H_2, H)CH^+. Whilst CH^+ flows at the ion speed, CH, which forms in the dissociative recombination reaction CH^+_3(e^-, H_2)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.
Flower David R.
Pineau des Forêts Guillaume
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