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.

URL: http://adsabs.harvard.edu/abs/1988A%26A...195..257...

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.

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