Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989azh....66.1142z&link_type=abstract
Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 66, Nov.-Dec. 1989, p. 1142-1153. In Russian.
Astronomy and Astrophysics
Astronomy
11
Astronomical Spectroscopy, H Ii Regions, Molecular Clouds, Carbon Monoxide, Gas Density, Hydrocyanic Acid, Infrared Sources (Astronomy), Milky Way Galaxy, Spectral Line Width
Scientific paper
The results of a survey of molecular clouds associated with Sharpless H II regions in the J=1-0 HCN and H13CN lines are analyzed. Comparison is made with CO and IR observational data. The relative number of clouds with noticeable HCN emission decreases as the distance to the center of the Galaxy increases. There is a correlation between the HCN and CO radiation temperatures. The HCN line widths are close to the CO widths. The upper limit for the gas density in clouds for homogeneous models is about 30,000 per cubic cm. It is preferable to explain some HCN emission features in the framework of models that assume a clump structure on the beamsize scale. The gas density in the clumps should be about 300,000 per cubic cm.
Lapinov Alexander V.
Pirogov Lev E.
Zinchenko I. I.
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