Title

THE C3H2220-211 TRANSITION - ABSORPTION IN COLD DARK CLOUDS

Publication Date

1986

Journal or Book Title

ASTROPHYSICAL JOURNAL

Abstract

The first observations of the 2(20)-2(11) transition of cyclopropenylidene (C3H2) at 21.6 GHz are described. The most significant finding is that the 2(20)-2(11) transition line is always seen in absorption, in contrast to the 18.3-GHz 1(10)-1(01) resonance line of the ortho species which always appears in emission in cold dust clouds. Thus the former must have an excitation temperature less than the brightness temperature of the universal microwave background and becomes only the second molecule to exhibit such 'refrigeration' below this temperature in cold, dark dust clouds.

Comments

The published version is located at http://adsabs.harvard.edu/doi/10.1086/184730

Volume

307

Pages

L69-L73

Issue

2

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