H2 densities and masses of the molecular clouds close to the galactic center

Details H2 densities and masses of the molecular clouds close to the galactic center H2 densities and masses of the molecular clouds close to the galactic center

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...125..136g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 125, no. 1, Aug. 1983, p. 136-145.

Astronomy and Astrophysics

Astrophysics

41

Astronomical Maps, Density Distribution, Formaldehyde, Galactic Nuclei, Molecular Clouds, Absorption Spectra, Electron Transitions, Interstellar Matter, Line Spectra

Scientific paper

Summer 1981 observations at 14.5 GHz (the 2/11-2/12 absorption line of H2CO) toward the molecular clouds at the galactic center, obtained with the 100-m Effelsberg telescope, are reported. Further observations at 4.8 GHz of the 1/10-1/11 lines of H2(C-12)O and H2(C-13)O in the cloud M-0.13-0.08 were made in 1981 and 1982. Maps of line intensity and optical depth are presented and discussed in terms of cloud locations. A large-velocity-gradient radiative-transfer model is used to estimate H2 densities (100,000/cu cm), H2CO abundances (10 to the -10th sec pc/km), H2 column densities (10 to the 24th/sq cm), and stable high-density core masses (10 to the 6th - 10 to the 7th solar mass). Comparison of maps of 14.5-GHz, 140-GHz, and NH3 emissions places the '20-km/sec' cloud M-0.13-0.08 in front of most of the Sgr A continuum and the '40-km/sec' cloud M-0.02-0.07 between Sgr A West and the nonthermal ridge of Sgr A East, and hence beyond the galactic center. The (C-12)/(C-13) ratio toward M-0.13-0.08 is found to be 20 + or - 5, consistent with the carbon enrichment of the inner region of the galactic center.

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