Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...253..541c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 253, no. 2, Jan. 1992, p. 541-556. Research supported by Max-Planck-Institut f
Astronomy and Astrophysics
Astrophysics
72
Gas Density, H Ii Regions, Interstellar Gas, Molecular Gases, Molecular Clouds, Radio Spectra
Scientific paper
The paper reports on new molecular line observations at 1.3 and 3.0 mm toward eleven UC H II regions, made using the IRAM 30-m telescope on Pico Veleta (Spain). The lines observed were (C-13)O (1-0 and 2-1), CS (2-1 and 5-4), and CH3CN (6-5 and 12-11). The data led to the following conclusions: (1) the peak line velocities of all three molecules agree for a given source to within about 2.5 km/sec, indicating that these molecules may probe the same gas; (2) the partial CS line maps indicate that this gas is centered on and confined to a radius smaller than 15 arcsec from the H II region; (3) both the CS and CH3CN line intensities imply densities above 10 exp 5/cu cm, and kinetic temperatures not lower than 100 K; and (4) CS and (C-13)O molecules are observed over about the same range in velocities and have similar line profiles.
Churchwell Edward
Walmsley Charles Malcolm
Wood Douglas O. S.
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