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H2CS ABUNDANCES AND ORTHO-TO-PARA RATIOS IN INTERSTELLAR CLOUDS
ASTRONOMY AND ASTROPHYSICS
  • YC MINH
  • William M. Irvine, University of Massachusetts - Amherst
  • MK BREWER
Publication Date
1991
Abstract
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.
Comments

The published version is located at http://adsabs.harvard.edu/full/1991A%26A...244..181M

Pages
181-189
Citation Information
YC MINH, William M. Irvine and MK BREWER. "H2CS ABUNDANCES AND ORTHO-TO-PARA RATIOS IN INTERSTELLAR CLOUDS" ASTRONOMY AND ASTROPHYSICS Vol. 244 Iss. 1 (1991)
Available at: http://works.bepress.com/wirvine/108/