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In Search of ≲ 5 K Galactic Molecular Gas

Published online by Cambridge University Press:  14 August 2015

R. H. Rubin ,
Neal J. Evans II  and
B. Zuckerman
R. H. Rubin
Affiliation:
∗ California State University, Fullerton.
Neal J. Evans II
Affiliation:
∗∗ Department of Astronomy and Electrical Engineering Research Laboratory, the University of Texas at Austin.
B. Zuckerman
Affiliation:
† University of Maryland.

Abstract

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Existing surveys of our galaxy are able to detect CO clouds with an excitation temperature Tex ≳ 5 K. We have made observations to determine if a substantial molecular component is colder than ∼ 5 K. We compared CO emission features with H2CO absorption against 17 continuum sources near the galactic plane. After elimination of features in the spectra that are probably associated with known H II regions, there were 39 clouds remaining, most of which show an excellent kinematic agreement between H2CO and CO. The results do not suggest the existence of a large amount of mass in ultra-cold molecular clouds.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 87: Interstellar Molecules , 1980 , pp. 113 - 114
Copyright
Copyright © Reidel 1980