Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980rspta.296..407d&link_type=abstract
(Royal Society, Discussion on the Origin and Early Evolution of the Galaxies, London, England, Feb. 14, 15, 1979.) Royal Society
Astronomy and Astrophysics
Astronomy
Hydrogen Clouds, Intergalactic Media, Nebulae, Radio Sources (Astronomy), Centimeter Waves, Galactic Evolution, Hydrogen Atoms, Neutral Gases, Red Shift
Scientific paper
No evidence has been found for distributed H I at red shifts less than 2, although clumped H I is found in the absorption spectra of quasars. Observations of nearby groups of galaxies indicate the presence of substantial amounts of H I lying outside the optical confines of the galaxies. Some of this material is in the form of tidal bridges and tails and some is condensed into discrete intergalactic clouds. H I observations have also been used to investigate with higher precision than hitherto the virial mass of groups of galaxies. Two such groups have a lower mass and a lower mass light ratio than obtained from equivalent optical studies. The orgin of this difference is not fully understood, but it may have consequences for the conventional methods of determining the mass density of the Universe. Finally, searches for H I in the epoch of galaxy formation are described. Limits have been set on the masses and the volume density of protoclusters at z = 3.3 and 4.9. This appears to be an important area for further observational and theoretical study.
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