The molecular cloud Sagittarius B2
1975; IOP Publishing; Volume: 201; Linguagem: Inglês
10.1086/153892
ISSN1538-4357
AutoresN. Z. Scoville, P. M. Solomon, A. A. Penzias,
Tópico(s)High-pressure geophysics and materials
Resumoview Abstract Citations (165) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The molecular cloud Sagittarius B2. Scoville, N. Z. ; Solomon, P. M. ; Penzias, A. A. Abstract 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. Publication: The Astrophysical Journal Pub Date: October 1975 DOI: 10.1086/153892 Bibcode: 1975ApJ...201..352S Keywords: Far Infrared Radiation; Interstellar Gas; Molecular Gases; Nebulae; Astronomical Maps; Carbon Monoxide; Infrared Astronomy; Molecular Spectra; Sagittarius Constellation; Astrophysics full text sources ADS | data products SIMBAD (3)
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