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Abundances of Heavy Elements and CO Molecules in High Redshift Damped Lyman-alpha Galaxies
Limin Lu, Wallace L. W. Sargent, Thomas A. Barlow
Damped Lyman-alpha systems seen in spectra of background quasars are generally thought to represent high redshift counterparts of present-day galaxies. We summarize observations of…
Abundances in Damped Lyman-alpha Systems and Chemical Evolution of High Redshift Galaxies
Limin Lu, Wallace L. W. Sargent, Thomas A. Barlow
Recent abundance measurements in damped Lyman-alpha galaxies, supplemented with unpublished Keck observations, are discussed. The metallicity distribution with cosmic time is exami…
Partial Coverage and Time Variability of Narrow-Line Intrinsic QSO Absorption Systems
Thomas A. Barlow, F. Hamann, W. L. W. Sargent
It is possible to distinguish ``intrinsic'' absorption systems (gas clouds within the quasar environment) from ``intervening'' systems (gas clouds unrelated to the quasar phenomeno…
Initial Chemical Enrichment in Galaxies
Limin Lu, Wallace L. W. Sargent, Thomas A. Barlow
We present evidence that damped Lyman-alpha galaxies detected in spectra of quasars may not have started forming stars until the redshift z~3. If damped Lyman-alpha absorbers are t…