The impact of dust and ionization effects on abundance measurements of Damped Ly alpha systems

Details The impact of dust and ionization effects on abundance measurements of Damped Ly alpha systems The impact of dust and ionization effects on abundance measurements of Damped Ly alpha systems

2001-08-29

arxiv.org/abs/astro-ph/0108466v2

Astronomy and Astrophysics

Astrophysics

10 pages, LaTeX (macro newpasp.sty), 3 figures, one reference corrected; invited talk in "Chemical Enrichment of Intracluster

Scientific paper

Studies of elemental abundances are a fundamental tool for unveiling the nature of the high-redshift (proto-)galaxies associated to Damped Ly alpha systems (DLAs). The present contribution analyses the impact of dust and ionization effects on abundance measurements in DLAs. The behaviour of the alpha/Fe abundance ratio corrected for such effects is used to derive information on the chemical history and nature of DLA galaxies. The alpha/Fe data indicate that DLAs at z~2.5 do not represent a homogeneous class of objects. On average, DLAs show non-enhanced alpha/Fe ratios at low metallicity, suggesting an origin in galaxies with low or intermittent star formation rates.

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