Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...201..352s&link_type=abstract
Astrophysical Journal, vol. 201, Oct. 15, 1975, pt. 1, p. 352-365.
Astronomy and Astrophysics
Astronomy
149
Far Infrared Radiation, Interstellar Gas, Molecular Gases, Nebulae, Astronomical Maps, Carbon Monoxide, Infrared Astronomy, Molecular Spectra, Sagittarius Constellation
Scientific paper
The structure of the Sgr B2 molecular cloud has been studied by detailed and extensive mappings of the CO, (C-13)O, CS, and H2CO (2-cm) transitions. The cloud consists of a dense core at the OH maser position plus a very large envelope 45 pc across. Sagittarius B2 is one of the most massive objects in the Galaxy, containing about 3 million solar masses - an estimate arrived at independently from calculated (C-13)O column densities, from application of the virial theorem, and from far-infrared measurements. The molecular gas has an average temperature of approximately 20 K; 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 is found to be dominated by large-scale systematic motions with velocity not a monotonic function of radius.
Penzias Arno A.
Scoville Nicholas Z.
Solomon Philip M.
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