Interstellar sulfur chemistryThe results of a chemical model of SO, CS, and OCS chemistry in dense clouds are summarized. The results are obtained from a theoretical study of sulfur chemistry in dense interstellar clouds using a large-scale time-dependent model of gas-phase chemistry. Among the results are the following: (1) owing to activation energy, the reaction of CS with O atoms is efficient as a loss mechanism of CS during the early phases of cloud evolution or in hot and oxygen-rich sources such as the KL nebula; (2) if sulfur is not abnormally depleted in dense clouds, then the observed abundances of SO, SO2, H2S, CS, OCS, H2CS, and SiS indicate that sulfur is mostly atomic in dense clouds; and (3) OCS is stable against reactions with neutral atoms and radicals in dense clouds.
Document ID
19810043308
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Prasad, S. S. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Huntress, W. T., Jr. (California Institute of Technology, Jet Propulsion Laboratory, Pasadena Calif., United States)