Abstract
Millimeter-wave emission in the 1/sub 0/..-->..0/sub 1/, 2/sub 2/..-->..1/sub 1/, 3/sub 2/..-->..2/sub 1/, 2/sub 3/..-->..1/sub 2/, 4/sub 5/..-->..4/sub 4/, and 4/sub 3/..-->..3/sub 2/ transitions of /sup 32/SO and in the 3/sub 2/..-->..2/sub 1/ and 2/sub 3/..-->..1/sub 2/ transitions of /sup 34/SO is reported. A survey toward 18 sources shows that the galactic distribution of SO is similar to that of CS and H/sub 2/S. Declination-versus-velocity maps of the 2/sub 2/..-->..1/sub 1/, 3/sub 2/..-->..2/sub 1/, and 4/sub 3/..-->..3/sub 2/ transitions are used to study the anomalously large line widths near the Kleinmann-Low nebula. The /sup 34/SO lines are about as strong as predicted from the terrestrial abundance ratio /sup 34/S//sup 32/S. A map of the 3/sub 2/..-->..2/sub 1/ transition toward more than 100 points in rho Ophiuchi reveals two SO peaks of comparable intensity (one is approx.3'.5 northeast and the other is 15' southeast of the central peak in /sup 12/CO). SO emission in rho Ophiuchi occurs in a region where 6 cm H/sub 2/CO absorption is at a minimum. Predictions of line intensities are used to derive SO abundances in Orion A, NGC 2264, W49, and eight other sources. The SO column density is 9 or approx. =2 x 10/supmore » 14/ cm/sup -2/, except toward the Kleinmann-Low nebula, where the value is approx.10/sup 16/ cm/sup -2/. The H/sub 2/S to SO ratio agrees well with predictions based on an ion-molecule reaction scheme, but the CS to SO ratio may be higher than predicted by an order of magnitude.« less
Published Version
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