Abstract
Surveys for damped Lyα absorption systems indicate that the neutral gas content of the universe increases with redshift at z < 3.3. The evolution may be due to gas consumption by star formation in protogalaxies. The redshift dependence of the neutral gas content at z > 3.3 places restrictions on various models for structure formation. The metal content of the damped Lyα systems is discussed. Accurate spectra obtained with the HIRES echelle spectrograph on the Keck 10 m telescope are used to obtain accurate metallicities of damped Lyα systems for the first time. The small sample reveals a wide range of metallicities. The kinematic structure of the gas is consistent with a thick, rapidly rotating disk.KeywordsStar FormationColumn DensityHigh RedshiftDwarf GalaxyNearby GalaxyThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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