Statistics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.0309p&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #03.09; Bulletin of the American Astronomical Society, Vol. 32, p.1386
Statistics
1
Scientific paper
In a previous paper we demonstrated that the mean metallicity of damped Lyα systems exhibits no significant evolution from z=2-4. This result is surprising because it contradicts nearly every model of chemical evolution in the early universe. At z>3, however, the analysis was based on only ~ 10 systems and suffered from small number statistics. To address this concern we have initiated a survey of z>3 damped Lyα systems with the new Echellette Spectrograph and Imager (ESI) on the Keck II telescope. By taking advantage of the unique capabilities of ESI, we are efficiently discovering and measuring the metallicity of many new z>3 damped systems. This paper presents the first results of the survey including [Fe/H] measurements of more than 10 new systems. The combined sample still indicates minimal evolution in the mean metallicity from z=2-4 but at higher statistical significance. In the next few years we expect to identify N ~ 40 new systems and robustly examine the chemical enrichment history of galaxies in the early universe.
Gawiser Eric J.
Prochaska Jason Xavier
Wolfe Arthur M.
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