SEARCH FOR Λ-DOUBLING TRANSITIONS OF SiH IN ORION KL
نویسنده
چکیده
A recent submillimeter line survey of Orion KL claimed detection of SiH. This paper 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 (4σ) 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. Subject headings: ISM: molecules — ISM: individual (Orion KL) — radio lines: ISM
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