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Effects of shocks on the sulfur chemistry of a dense interstellar cloud
Mitchell, G. F.
AA(Saint Mary's University, Halifax, Canada)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 287, Dec. 15, 1984, p. 665-670. Research supported by the Natural Sciences and Engineering Research Council of Canada. (ApJ Homepage)
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NASA/STI Keywords:
Interstellar Chemistry, Molecular Clouds, Shock Wave Interaction, Sulfur Compounds, Carbon Compounds, Chemical Reactions, Interstellar Gas, Nitrogen Compounds, Propagation Velocity, Reaction Kinetics
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Time-dependent kinetic calculations are carried out to follow the postshock abundances of sulfur molecules after the passage of shocks with speeds in the range of 5-15 km/s. The preshock gas density is 10,000 per cu cm. Abundances are followed for 100,000 yr after the shock. A comparison to a previous work (Mitchell, 1984) which used 8 km/s speed and 1,000,000 per cu cm density shows quantitative agreement for the SO species and qualitative agreement for HS, H2S, and CS species. For these species, as well as for S, S2, and H2CS, abundance profiles behind shocks of speed 5, 10, and 15 km/s and postshock column abundances are presented. It is shown that the major result of shocks is the conversion of atomic O, N, C, and S into various molecules. Tables and a block diagram of definitive chemical reactions are given.

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