SiS in Orion-KL - Evidence for 'outflow' chemistry

Details SiS in Orion-KL - Evidence for 'outflow' chemistry SiS in Orion-KL - Evidence for 'outflow' chemistry

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324..544z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 324, Jan. 1, 1988, p. 544-552.

Astronomy and Astrophysics

Astrophysics

16

Emission Spectra, Interstellar Chemistry, Molecular Rotation, Orion Nebula, Silicon Compounds, Sulfides, Abundance, Astronomical Spectroscopy, Bandpass Filters, Line Spectra, Spectrum Analysis

Scientific paper

SiS has been conclusively detected toward Orion-KL via its J = 6 - 5 and J = 5 - 4 rotational transitions at 91 and 109 GHz. Line profiles indicate that SiS is associated with the moderate velocity outflow (V ≡ 18 km s-1) centered on IRc2 and observed in thermal SiO, the NH3 "plateau", and OH, H2O, and SiO masers. An SiO/SiS ratio of ≡60 is estimated for the outflow material, remarkably close to the cosmic O/S ratio of ≡40 and contrasting with the SiO/SiS value of ⪆103 predicted by ion-molecule models. In addition to SiS, some twenty new unidentified lines near 91 and 109 GHz were detected toward KL.

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