Observations of some oxygen-containing and sulfur-containing organic molecules in cold dark clouds

Details Observations of some oxygen-containing and sulfur-containing organic molecules in cold dark clouds Observations of some oxygen-containing and sulfur-containing organic molecules in cold dark clouds

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342..871i&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 15, 1989, p. 871-875. Research supported by the U.S.-Sweden Coope

Astronomy and Astrophysics

Astrophysics

44

Interstellar Chemistry, Interstellar Matter, Methyl Compounds, Molecular Clouds, Organic Sulfur Compounds, Formaldehyde, Formic Acid, Ketenes, Oxygen Compounds

Scientific paper

Observations of nine oxygen- and sulfur-containing organic molecules have been made toward the cold dark clouds TMC-1 and L134N. The presence of paraketene (H2C2O) in TMC-1 is confirmed for orthoketene, and has been observed for the first time and a total ketene column density of about 10 to the 13th/sq cm is found. Thioformaldehyde (H2CS) is easily detectable in both TMC-1 and L134N, with a column density about five times larger in the former source. The fractional abundance of ketene is comparable to the predictions of ion-molecule chemistry, while that of thioformaldehyde in TMC-1 is one to two orders of magnitude greater than that expected from such models at steady state. Interstellar sulfur chemistry thus continues to be poorly understood. Upper limits are set for the column densities of formic acid (HCOOH), vinyl alcohol (CH2CHOH), methyl formate (HCO2CH3), formamide (NH2CHO), methyl mercaptan (CH3SH), isothiocyanic acid (HNCS), and thioketene (H2C2S) in both sources.

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