Observations of H2S toward OMC-1

Y. C. Minh, L. M. Ziurys, W. M. Irvine, D. McGonagle

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Abstract

Interstellar hydrogen sulfide (H2S) and its isotopic variant (H234S) have been observed toward several positions in OMC-1 via their 110-101 transitions near 168 GHz using the FCRAO 14 m telescope. We derive total column densities toward Orion(KL) for the extended ridge, for the plateau, and for the hot core, in addition to values for other positions in OMC-1. The fractional abundance of H2S (∼ 10-9) in the quiescent regions of OMC-1 seems to be difficult to explain by currently known ion-molecule reactions. The fractional abundance of H2S relative to H2 is enhanced by a factor of 1000 in the hot core and the plateau relative to the quiescent clouds. This enhancement may be a result of grain surface chemistry and/or of high-temperature gas-phase chemistry. From the nondetection of HDS in its 211-212 transition, we estimate the abundance ratio [HDS]/[H2S] ≤ 0.02 in the hot core.

Original languageEnglish (US)
Pages (from-to)136-141
Number of pages6
JournalAstrophysical Journal
Volume360
Issue number1
DOIs
StatePublished - Sep 1 1990

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Keywords

  • Interstellar: molecules
  • Molecular processes
  • Nebulae: abundances
  • Nebulae: individual (OMC-1)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Minh, Y. C., Ziurys, L. M., Irvine, W. M., & McGonagle, D. (1990). Observations of H2S toward OMC-1. Astrophysical Journal, 360(1), 136-141. https://doi.org/10.1086/169103