Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...260..381g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 260, no. 1-2, p. 381-390.
Astronomy and Astrophysics
Astrophysics
29
Galactic Structure, Interstellar Matter, Massive Stars, Molecular Clouds, Star Formation, Continuous Radiation, Relic Radiation, Rotational Spectra
Scientific paper
The Sgr B2 star-formation region was used as a source of background continuum emission to detect seven diffuse molecular clouds. Clouds detected in absorption include the 'nuclear disk', the 3-kpc expanding arm, spiral arms in the Galactic plane, and two unidentified regions. The nuclear disk line profile was found to be inconsistent with homogeneous disk or bar models, instead suggesting irregular perturbation of the gas within a few hundred pc of the Galactic center. Absorption in CS was detected in two different rotational transitions, leading to reliable estimates of the physical parameters of the clouds. Results from an LTE analysis and from LVG modeling show that the absorption lines are mostly optically thin, with molecular densities about 10 exp 12 to 10 exp 14/sq cm per cloud.
Greaves Jane S.
Hasegawa Takuya
Ohishi Masaki
Sunada Kazuyoshi
White Glenn J.
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