CO J = 3-2 observations of the neutral disk in Sagittarius A West

Details CO J = 3-2 observations of the neutral disk in Sagittarius A West CO J = 3-2 observations of the neutral disk in Sagittarius A West

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348..503s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 10, 1990, p. 503-514.

Astronomy and Astrophysics

Astronomy

34

Carbon Monoxide, Milky Way Galaxy, Radio Sources (Astronomy), Sagittarius Constellation, Thermal Radiation, Electron Transitions, Fine Structure, Galactic Nuclei, Molecular Excitation, Spectral Emission

Scientific paper

Emission has been observed from the J = 3-2 rotational transition of CO over a substantial region in Sgr A West. The mapped region encompasses the dense rotating neutral disk, a structure which extends out to a radius of about 8 pc from the Galactic center. The observations show significant differences from previous CO J = 1-0 observations of Serabyn et al. (1986). In particular, the J = 3-2 emission is more centrally concentrated, and there are differences in the relative strengths of emission peaks in the two sets of maps. The derived picture is one of a disk with a significant excitation gradient, since the emission from high-excitation species declines as one moves out from the center. Typical values of the physical conditions present are density n = 20,000-200,000/cu cm and temperature T = 100-200 K. Antenna temperatures indicate optical depths greater than unity. A CO column density along a line of sight through a clump of roughly 2 x 10 to the 19th/sq cm is inferred.

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