Other
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223..743p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 223, Dec. 15, 1986, p. 743-756.
Other
35
Cosmochemistry, Interstellar Matter, Molecular Clouds, Photochemical Reactions, Shock Heating, Sulfur, Abundance, Hydrodynamics, Magnetohydrodynamics, Reaction Kinetics
Scientific paper
The column densities of sulphur-bearing molecules in diffuse clouds subject to shock heating have been calculated. Both one-fluid hydrodynamic and three-fluid magnetohydrodynamic models have been considered. It is found that observable colum densities of SH(+) and possibly other sulphur-bearing species should be present in MHD shocks with velocities of about 12 km/s and transverse magnetic field strengths of about 5 microG. On the other hand, the predicted column densities of SH(+) in one-fluid hydrodynamic shocks are below the limit of detectability. It follows that the observation of SH(+) along lines of sight where CH(+) is already observed, with column densities N(CH+) of about 10 to the 13th/sq cm, should provide discrimination between possible modes of shock propagation. Photoionization and photodissociation reactions are found to have a profound influence on the column densities of sulphur-bearing molecular species. Many of the rates of the photoprocesses are poorly known or estimated, and calculations or measurements of the relevant cross-sections are required.
Flower David R.
Pineau des Forêts Guillaume
Roueff Evelyne
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