Atomic hydrogen in galactic molecular clouds

Details Atomic hydrogen in galactic molecular clouds Atomic hydrogen in galactic molecular clouds

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219l..67b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 219, Jan. 15, 1978, p. L67-L72.

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56

Carbon Monoxide, Cosmic Dust, Hydrogen Atoms, Interstellar Gas, Microwave Spectra, Absorption Spectra, Astronomical Maps, Emission Spectra, Hydrogen Clouds

Scientific paper

By comparing observations of galactic carbon monoxide clouds with high-resolution (FWHP equals 3 arcmin) observations of atomic hydrogen, it is found that the molecular emission is strongly correlated with the appearance of narrow minima in the H I profiles. The steep wings of these minima suggest that they are due to self-absorption. Similarities of the spatial and kinematic behavior in the molecular and atomic observations lead to the attribution of these features to a residual amount of very cold (temperature less than 20 K) H I in molecular clouds. The correlations suggest the plausibility of studying the statistics and intrinsic physical characteristics of cold star-forming regions throughout the galactic disk by using high-resolution observations of H I.

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