Search for Lambda-Doubling Transitions of SiH in Orion KL

Details Search for Lambda-Doubling Transitions of SiH in Orion KL Search for Lambda-Doubling Transitions of SiH in Orion KL

2006-06-20

arxiv.org/abs/astro-ph/0606495v1

Astrophys.J.646:L57-L60,2006

Astronomy and Astrophysics

Astrophysics

4 pages, color, to appear in ApJL

Scientific paper

10.1086/507026

A recent submillimeter line survey of Orion KL claimed detection of SiH. This paper reports on GBT observations of the 5.7 GHz Lambda-doubling transitions of SiH in Orion. Many recombination lines, including C164-delta, are seen, but SiH is not detected. The nondetection corresponds to an upper limit of 1.5 x 10^15 cm^-2 (4 sigma) 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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