H2CS abundances and ortho-to-para ratios in interstellar clouds

Details H2CS abundances and ortho-to-para ratios in interstellar clouds H2CS abundances and ortho-to-para ratios in interstellar clouds

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244..181m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 1, April 1991, p. 181-189.

Astronomy and Astrophysics

Astrophysics

24

Formaldehyde, Interstellar Matter, Molecular Clouds, Ortho Hydrogen, Para Hydrogen, Sulfur Compounds, Abundance, Interstellar Gas, Star Formation

Scientific paper

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.

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