The correlation of spiral arm molecular clouds with cold atomic hydrogen

Details The correlation of spiral arm molecular clouds with cold atomic hydrogen The correlation of spiral arm molecular clouds with cold atomic hydrogen

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317..646p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 317, June 15, 1987, p. 646-652.

Other

19

Carbon Monoxide, Emission Spectra, Hydrogen Atoms, Molecular Clouds, Spiral Galaxies, Absorption Spectra, Interstellar Gas, Interstellar Radiation

Scientific paper

The relationship between molecular clouds and the cold atomic hydrogen gas seen in self-absorption has been examined in the longitude range l = 36°-40°. The results confirm those of an earlier study in another region of the Galaxy. By reanalyzing both sets of data, the authors show that those cold clouds which are detected both in H I self-absorption at λ = 21 cm against a hotter background and in CO emission at λ = 2.6 mm are confined to the Sagittarius spiral arm feature in velocity-longitude space. Outside of this arm feature, clouds which show both H I absorption and CO emission are very rare.

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