The Molecular Cloud Sgr B2 (10),
OWENS VALLEY RADIO OBSERVATORY PASADENA CALIF
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The structure of the Sgr B2 molecular cloud has been studied by detailed and extensive mappings of the CO, 13CO, CS and H2CO 20cm transitions. The cloud consists of a dense core at the OH maser position plus a very large r 45 pc envelope. The total mass of the cloud is estimated independently from calculated 13CO column densities, from application of the virial theorem, and from far infrared measurements. The molecular gas has an average temperature of about 20K that this is similar to the temperature of grains emitting far infrared radiation is taken as evidence of near thermal equilibrium between dust grains and H2. The dynamics of the gas in the cloud are found to be dominated by large scale systematic motions with velocity not a monotonic function of radius.