A search for SH(+) and CH(+) in diffuse and translucent clouds

Details A search for SH(+) and CH(+) in diffuse and translucent clouds A search for SH(+) and CH(+) in diffuse and translucent clouds

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98..926m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Sept. 1989, p. 926-930.

Other

8

Hydrides, Interstellar Chemistry, Molecular Ions, Shock Wave Propagation, Abundance, Endothermic Reactions, Hydrocarbons, Magnetohydrodynamic Waves, Positive Ions, Sulfur Compounds

Scientific paper

Results are reported from a search for SH(+) absorption at about 336 nm from diffuse interstellar clouds and high-latitude molecular clouds in the direction of nine early-type stars. Two of the lines of sight in the direction of translucent high-latitude molecular clouds were also searched for CH(+) absorption at 4232 nm. Both CH(+) and SH(+) are believed to be formed by endothermic reactions which require the passage of a shock through the diffuse cloud. SH(+), in particular, is thought to form as a consequence of an MHD shock. SH(+) was not detected from any of the lines of sight, nor was CH(+) detected from either of the high-latitude clouds. The N(SH+) upper limits obtained are marginally inconsistent with the presence of MHD shocks with velocities greater than 14 km/s, and the nondetections of CH(+) for the high-latitude clouds are inconsistent with current shock-chemistry models.

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