Watt, G. D.; White, G. J.; Millar, T. J. and van Ardenne, A.
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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|
|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)|
|Depositing User:||G. J. White|
|Date Deposited:||18 Apr 2012 14:49|
|Last Modified:||22 Jan 2016 14:03|
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