Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aipc...83...12s&link_type=abstract
IN: The galactic center; Proceedings of the Workshop, Pasadena, CA, January 7, 8, 1982 (A83-40676 19-90). New York, American Ins
Astronomy and Astrophysics
Astronomy
5
Formaldehyde, Galactic Nuclei, Milky Way Galaxy, Molecular Clouds, Radio Sources (Astronomy), Centimeter Waves, Continuous Radiation, Optical Thickness, Radial Velocity
Scientific paper
Observations of the molecular cloud complex H2CO emission around Sgr A at 140.8 GHz during two sessions at Kitt Peak are analyzed. A region 6 x 13 arcmin was mapped, showing half power velocity widths ranging from 30-50 km/sec. Formaldehyde was found towards Sgr West, and featured a radial velocity of about 40 km/sec. A significant velocity gradient was present across the complex, with largest values in the NE and lowest values in the SW. It was assumed that the clouds were a continuous belt of molecular gas and the total optical depth across the cloud was calculated based on the observed absorptions. The 6 mm features were similar to the 2 mm features, but fell where the 2 mm line reached a maximum. Sgr A E is concluded to be on the near side of the molecular cloud and Sgr A W on the far side. The molecular clouds would thereby have a velocity component directed toward the galactic center.
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