Abstract
Observations of the J=2-1 and J=1-0 rotational transitions of /sup 12/CO, /sup 13/CO, and C/sup 18/O are reported for 10 molecular clouds. An analysis of the data based on a large-velocity-gradient cloud model suggests that in most of these sources the average molecular hydrogen densities lie between 2000 and 8000 cm/sup -3/, while /sup 13/CO fractional abundances are approximately 3 x 10/sup -6/. These hydrogen densities are typically a factor of 10 lower than those inferred from observations of other molecules such as HCN, CS, or H/sub 2/CO; possible explanations for this discrepancy are discussed.
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