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• W2008991502 endingPage "92" @default.
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• W2008991502 abstract "We present a comprehensive analysis of the damped Lyα (DLA) abundance database presented in the first paper of this series. This database provides a homogeneous set of abundance measurements for many elements including Si, Cr, Ni, Zn, Fe, Al, S, Co, O, and Ar from 38 DLA systems with zabs > 1.5. With little exception, these DLA systems exhibit very similar relative abundances. There is no significant correlation in X/Fe with [Fe/H] metallicity, and the dispersion in X/Fe is small at all metallicity. We search the database for trends indicative of dust depletion and in a few cases find strong evidence. Specifically, we identify a correlation between [Si/Ti] and [Zn/Fe] which is unambiguous evidence for depletion. Following Hou and colleagues, we present [X/Si] abundances against [Si/H] + log N(H ) and note trends of decreasing X/Si with increasing [Si/H] + log N(H ) which argue for dust depletion. Similarly, comparisons of [Si/Fe] and [Si/Cr] against [Si/H] indicate significant depletion at [Si/H] > -1 but suggest essentially dust-free damped systems at [Si/H] 3.5, where small number statistics dominate the N(H I)-weighted mean; and (2) there is no evolution in the mean [Fe/H] metallicity from z = 1.7 to 3.5 but possibly a marked drop at higher redshift. We conclude with a general discussion on the physical nature of the DLA systems. We stress the uniformity of the DLA chemical abundances which indicates that the protogalaxies identified with DLA systems have very similar enrichment histories, i.e., a nearly constant relative contribution from Type Ia and Type II supernovae. The DLA systems also show constant relative abundances within a given system, which places strict constraints on the mixing timescales of the damped systems and may pose a great challenge to the protogalactic clump scenarios favored by hierarchical galaxy formation." @default.
• W2008991502 created "2016-06-24" @default.
• W2008991502 creator A5037615659 @default.
• W2008991502 creator A5085250575 @default.
• W2008991502 date "2002-02-10" @default.
• W2008991502 modified "2023-09-25" @default.
• W2008991502 title "The UCSD HIRES/Keck I Damped Lyα Abundance Database. II. The Implications" @default.
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• W2008991502 doi "https://doi.org/10.1086/338080" @default.
• W2008991502 hasPublicationYear "2002" @default.
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