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CCH N = 4-3 emission from dense interstellar clouds

Watt, G. D.; White, G. J.; Millar, T. J. and van Ardenne, A. (1988). CCH N = 4-3 emission from dense interstellar clouds. Astronomy & Astrophysics, 195(1-2) pp. 257–262.

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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.

Item Type: Journal Article
Copyright Holders: 1988 European Southern Observatory
ISSN: 1432-0746
Keywords: abundance; hydrocarbons; interstellar matter; molecular clouds; molecular rotation; hydrogen; infrared astronomy; optical thickness; stellar envelopes
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 33349
Depositing User: G. J. White
Date Deposited: 18 Apr 2012 14:49
Last Modified: 24 Feb 2016 06:42
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