Cold gas, the HI 21cm line and evolving galactic potentials

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dc.creatorBriggs, F. H.
dc.date2000-01-05
dc.date.accessioned2026-07-07T01:51:34Z
dc.date.available2026-07-07T01:51:34Z
dc.descriptionNeutral hydrogen traces gravitational potentials. In the nearby universe, 21cm emission-line surveys show that the bulk of the HI resides in well-formed, optically-luminous galaxies. At high redshift, 21cm line absorption against background radio quasars occurs in gas-rich systems identified with the highest HI column densities -- the ``damped Lyman alpha'' quasar absorption-line systems. High spatial-resolution observations of the redshifted 21cm line absorbers measure sizes and kinematics of the neutral absorbers.
dc.description8 pages, 2 figures. Invited review to appear in Proceedings of the XIXth Recontres de Moriond, on "Building the Galaxies: from the Primordial Universe to the Present," Editors F. Hammer, T.X. Thuan, V. Cayatte, B. Guiderdoni and J. Tran Thanh Van, Editions Frontieres
dc.identifierhttps://arxiv.org/abs/astro-ph/0001070
dc.identifierhttp://arxiv.org/abs/astro-ph/0001070
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/335
dc.subjectAstrophysics
dc.titleCold gas, the HI 21cm line and evolving galactic potentials
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