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Title:
Search for Λ-doubling Transitions of SiH in Orion Kleinmann-Low
Authors:
Fish, Vincent L.
Affiliation:
AA(National Radio Astronomy Observatory, P. O. Box O, 1003 Lopezville Road, Socorro, NM 87801; )
Publication:
The Astrophysical Journal, Volume 646, Issue 1, pp. L57-L60. (ApJL Homepage)
Publication Date:
07/2006
Origin:
UCP
ApJ Keywords:
ISM: Individual: Name: Orion Kleinmann-Low, ISM: Molecules, Radio Lines: ISM
DOI:
10.1086/507026
Bibliographic Code:
2006ApJ...646L..57F

Abstract

A recent submillimeter line survey of Orion KL claimed detection of SiH. This Letter reports on GBT observations of the 5.7 GHz Λ-doubling transitions of SiH in Orion. Many recombination lines, including C164δ, are seen, but SiH is not detected. The nondetection corresponds to an upper limit of 1.5×1015 cm-2 (4 σ) for the beam-averaged column density of SiH. This suggests that the fractional abundance of SiH in the extended ridge is no more than twice that in the hot core.
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