HI lambda 21 CM observations of low ionization absorption systems

Details HI lambda 21 CM observations of low ionization absorption systems HI lambda 21 CM observations of low ionization absorption systems

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983liaco..24..586b&link_type=abstract

IN: Quasars and gravitational lenses; Proceedings of the Twenty-fourth Liege International Astrophysical Colloquium, Cointe-Ougr

Astronomy and Astrophysics

Astronomy

Absorption Spectra, Centimeter Waves, H Lines, Hydrogen Clouds, Radio Astronomy, Galactic Structure, Magnesium, Red Shift

Scientific paper

A description is presented of two radio frequency studies with results which are related to the nature of the narrow-line low-ionization QSO absorption systems. One of the studies involved a search for lambda 21 cm absorption in redshifted systems selected for Mg II absorption. It was found that 21 cm absorption is rare, occurring in 2 out of 18 systems. The second study included a search for HI emission from the halo regions of nearby (z less than 2000 km/s) galaxies. The picture which emerges in connection with the first study is consistent with a disk-halo configuration, in which the line of sight to QSOs occasionally encounters a high column density cloud in a galactic disk.

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