Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...195..257w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 195, no. 1-2, April 1988, p. 257-262. SERC-supported research.
Astronomy and Astrophysics
Astronomy
4
Abundance, Hydrocarbons, Interstellar Matter, Molecular Clouds, Molecular Rotation, Hydrogen, Infrared Astronomy, Optical Thickness, Stellar Envelopes
Scientific paper
The authors have searched for N = 4 - 3 rotational line emission from the ethynyl radical CCH, at 349 GHz toward a number of galactic molecular clouds. They have detected emission from ten giant molecular clouds and have derived CCH column densities on the order of 1014 - 1015cm-2. They find that CCH emission arises from dense gas, n(H2) ≡ 104 - 105cm-3, but not from very dense material, n(H2) > 106cm-3, nor from hot gas such as the "hot core" region in Orion.
Millar Thomas J.
van Ardenne Arnold
Watt Graeme D.
White Glen J.
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