The Association of Neutral Hydrogen with HII Regions and Radio Sources

Details The Association of Neutral Hydrogen with HII Regions and Radio Sources The Association of Neutral Hydrogen with HII Regions and Radio Sources

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jkas...18..100m&link_type=abstract

Journal of Korean Astronomical Society, vol.18, p.100-110

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The HI features associated with HII regions and radio sources in the galactic plane are searched in the Maryland-Green Bank Galactic 21-cm Line Survey. Among the twenty-eight such objects, twenty-five show HI depression features, two no feature, and an emission feature with excess HI brightness temperature. Most of these feature are surrounded by strong HI emissions. The depth of the HI depression is proportional to the radio continuum brightness temperature. The angular dimensions of the HI feature and radio source are comparable. The small HI depressions shown at the positions of HII region located in the outer solar circle are considered to be HI self-absorption features of very cold HI gas.

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