Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...223..293s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 223, no. 1-2, Oct. 1989, p. 293-303. Research supported by the Naturvetenskapl
Astronomy and Astrophysics
Astronomy
15
Formaldehyde, Milky Way Galaxy, Molecular Clouds, Radio Sources (Astronomy), Sagittarius Constellation, Absorption Spectra, Astronomical Spectroscopy, Emission Spectra, Spectral Line Width, Star Formation, Temperature Distribution
Scientific paper
The 2-mm transition of orthoformaldehyde at 140.8 GHz was used to map a 6x13-arcmin region around Sgr A with an angular resolution of 1 arcmin. Sgr A West and the peaks of the +20 and +40 km/s molecular clouds in the Sgr A complex were also observed in the 244.9-GHz J=5-4CS emission line with an angular resolution of 1.2 arcmin. The 2-mm H2CO and 1-mm CS observations support the conclusion that the +20 and +40 km/s molecular clouds are condensations in a molecular belt lying parallel to the Galactic plane. There seems to be no star formation activity in the inner cores of the two molecular clouds. However, some signs of star formation are observed near the edges of the cloud cores.
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