Computer Science
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980stin...8130064g&link_type=abstract
Unknown
Computer Science
Atmospheric Chemistry, Emission Spectra, Interstellar Matter, Molecular Clouds, Carbonyl Compounds, Reaction Kinetics, Spectrum Analysis, Sulfides
Scientific paper
We have carried out a study of the carbonyl sulfide (OCS) molecule in 24 interstellar and circumstellar molecular clouds, and detected it in a total of 10 sources and 7 different transitions. Analysis of the data using hydrogen densities derived from a study of CS (Linke and Goldsmith 1980), and assuming that the OCS lines are optically thin, yields a mean column density N(OCS)= 3 x 10 to the 14th power/sq cm in ten interstellar clouds while the average fractional abundance N(OCS)/N(H2)= 1.6 x 10 to the minus 9th power, consistent with the theoretical prediction of Oppenheimer and Dalgarno (1974). The results of maps and analysis of multiple transitions in several sources suggest that the regions responsible for the OCS emission are only marginally resolved with a beamsize of approx. 2'. Direct measurements yield (OCS/O13CS) = 21 and (OCS/OC34S) = 16 in SGR B2, compared to terrestrial values of 89 and 23, respectively.
Goldsmith Paul F.
Linke Richard A.
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