A study of interstellar carbonyl sulfide

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Abundance, Carbonyl Compounds, Interstellar Gas, Molecular Clouds, Stellar Envelopes, Sulfides, Electron Transitions, Gas Density, Isotopes, Line Spectra, Microwave Spectra, Molecular Excitation, Molecular Spectra, Spectrum Analysis

Scientific paper

The OCS molecule has been studied in 24 interstellar and circumstellar molecular clouds and detected in a total of 10 sources and seven different transitions. Analysis of the data using hydrogen densities derived from a study of CS and assuming that the OCS lines are optically thin, yields a mean column density of 3 x 10 to the 14th per sq cm in 10 interstellar clouds, while the average fractional abundance of N(OCS)/N(H2) = 1.6 x 10 to the -9th. The results of maps and analyses of multiple transitions in several sources suggest that the regions responsible for the OCS emission are only marginally resolved with a beamsize of about 2 arcmin.

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