Dust depletion and abundance pattern in damped Lyman-alpha systems: a sample of Mn and Ti abundances at z<2.2

Preprint

6 February 2002

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.astro-ph/0202134

Abstract

We analyse a sample of 24 damped Lyman-alpha (DLA)/moderate DLA systems at 0.3<z~-0.5, the intrinsic (dust-corrected) abundance pattern of Si, Ti, Cr and Mn in DLA absorbers closely follows the trends observed in Galactic stars and these absorbers should thus have a chemical evolution similar to that of our Galaxy. At lower metallicity, some absorbers do follow the trends present in Galactic stars but a substantial fraction of them have elemental ratios (in particular [Si/Fe]dc and [Mn/Fe]dc) closer to the solar values than Galactic stars. This could be explained by a larger contribution of type Ia supernovae to the chemical enrichment of these DLA absorbers than in Galactic stars of similar metallicity. This metal-poor DLA absorber population could trace HI-rich dwarf galaxies. (Abridged)

Keywords

All Related Versions

Version 1, 2002-02-06, ArXiv
Published version: Astronomy & Astrophysics, 385 (3), 802.

This publication has 0 references indexed in Scilit: