Microwave observations of hydrogen sulfide and searches for other sulfur compounds in Comets Austin (1989c1) and Levy (1990c)

Details Microwave observations of hydrogen sulfide and searches for other sulfur compounds in Comets Austin (1989c1) and Levy (1990c) Microwave observations of hydrogen sulfide and searches for other sulfur compounds in Comets Austin (1989c1) and Levy (1990c)

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...93..246c&link_type=abstract

Icarus (ISSN 0019-1035), vol. 93, Oct. 1991, p. 246-258. Research supported by Instituto de Radioastronomia Milimetrica.

Astronomy and Astrophysics

Astronomy

25

Austin Comet, Comet Nuclei, Hydrogen Sulfide, Radio Telescopes, Molecular Collisions, Volatility, Wave Excitation

Scientific paper

The 2-mm 1(10)-1(01) rotational line of H2S has been detected in Comets Austin and Levy. While the 2(20)-2(11) line of this compound was also found, searches of Comet Levy for such molecular species as SO2, OCS, and H2CS were negative. An out-of-equilibrium excitation model is used to infer an H2S production rate that is about 0.002 that of water for both of the present comets. S appears to be depleted in cometary volatiles relative to cosmic abundance. The presence of so volatile a molecule as H2S in cometary nuclei is judged to indicate the formation and long persistence of these comets at very low temperatures.

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