H2CS ABUNDANCES AND ORTHO-TO-PARA RATIOS IN INTERSTELLAR CLOUDS
Journal or Book Title
ASTRONOMY AND ASTROPHYSICS
Several H2CS ortho and para transitions have been observed toward interstellar molecular clouds, including cold, dark clouds and star-forming regions. H2CS fractional abundances f(H2CS) about 1-2 10 to the -9th relative to molecular hydrogen toward TMC-1, Orion A, and NGC 7538, and about 5 10 to the -10th for L134N are derived. The H2CS ortho-to-para ratios in TMC-1 are about 1.8 toward the cyanopolyyne peak and the ammonia peak, which may indicate the thermalization of H2CS on 10 K grains. A ratio of about 3, the statistical value, for Orion (3N, 1E) and NGC 7538 is derived, while a value of about 2 for Orion (KL) is found.
MINH, YC; Irvine, William M.; and BREWER, MK, "H2CS ABUNDANCES AND ORTHO-TO-PARA RATIOS IN INTERSTELLAR CLOUDS" (1991). ASTRONOMY AND ASTROPHYSICS. 239.
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