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 and Astrophysics, 195(1-2), pp. 257–262.

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Abstract

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:	0004-6361
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:	Glenn White
Date Deposited:	18 Apr 2012 14:49
Last Modified:	19 Apr 2012 03:04
URI:	http://oro.open.ac.uk/id/eprint/33349

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