A search for ultracold molecular gas in our Galaxy

Details A search for ultracold molecular gas in our Galaxy A search for ultracold molecular gas in our Galaxy

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...239..839e&link_type=abstract

Astrophysical Journal, Part 1, vol. 239, Aug. 1, 1980, p. 839-843.

Astronomy and Astrophysics

Astrophysics

6

Carbon Monoxide, Cold Gas, Formaldehyde, Interstellar Gas, Milky Way Galaxy, Molecular Excitation, Molecular Gases, Absorption Spectra, Spectral Emission

Scientific paper

Existing galactic plane CO surveys are able to detect molecular clouds which contain substantial CO with an excitation temperature exceeding 5 K. The possibility that substantial numbers of molecular clouds exist where the excitation temperature is less than 5 K was tested. CO observations were obtained in the direction of 17 continuum sources which showed multiple H2CO absorption features at a wavelength of 6 cm. The H2CO features were taken as evidence of a molecular cloud, and CO observations were used to determine excitation temperature of that cloud. Although a few clouds may have excitation temperature slightly less than 5 K, a large amount of mass does not appear to be hidden in such ultracold molecular clouds with detectable H2CO absorption.

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