White, Glenn J. and Phillips, J. P.
Observations of the 31,3-20,2 transition of SO2.
Monthly Notices of the Royal Astronomical Society, 203 pp. 661–666.
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We have measured the 31,3-20,2 transition of SO2 in W49, W51, OriA and Sgr B2, and found SO2 emission upper limits in a further seven sources. The total number of SO2 molecules in individual clouds is found to range from ~2×1051 to ~1053, implying a relative abundance X(SO2) ~ 10-6 in OriA, and lower limits varying from X(SO2) ~ 10-9 to ~10-8 in the remaining sources. These results are briefly discussed within the context of current models of interstellar cloud chemistry.
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