Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...88..615c&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 88, no. 3, June 1991, p. 615-624.
Astronomy and Astrophysics
Astronomy
12
Hydrogen Atoms, Hydroxyl Emission, Interstellar Gas, Molecular Clouds, Radio Astronomy, Star Formation
Scientific paper
This paper presents OH 1667-MHz observations covering the CrA dark cloud complex, as well as HI 21-cm observations in a large region around the complex. The OH profiles are of simple structure indicating the presence of only one component with a mean velocity V(OH) about +5.5 km/s. Three OH clumps are apparent, which are coincident with regions of high photographic extinction. The gas to dust ratio derived from these observations is similar to the average value obtained for other dark clouds and shows that OH and dust are well mixed in the CrA dark cloud complex. The total mass estimated for the molecular cloud amounts to M(T) about 7000 solar masses. The HI observations show the well-known ridge of local gas of low positive velocities. The accordance between the velocities of molecular and atomic gas in the region suggests that the molecular complex is embedded in the local HI-ridge. It is suggested that they both are related to Lindblad's feature A (i.e., to Gould's belt).
Cappa de Nicolau C. E.
Poppel W. G. L.
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