OBSERVATIONS OF SOME OXYGEN-CONTAINING AND SULFUR-CONTAINING ORGANIC-MOLECULES IN COLD DARK CLOUDS
Journal or Book Title
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.
Irvine, William M.; FRIBERG, P; KAIFU, N; KAWAGUCHI, K; KITAMURA, Y; MATTHEWS, HE; MINH, Y; SAITO, S; UKITA, N; and YAMAMOTO, S, "OBSERVATIONS OF SOME OXYGEN-CONTAINING AND SULFUR-CONTAINING ORGANIC-MOLECULES IN COLD DARK CLOUDS" (1989). ASTROPHYSICAL JOURNAL. 255.