Metal-rich damped Ly{alpha} systems at z~2 Virtual Observatory Resource

Authors
  1. Berg T.A.M.
  2. Ellison S.L.
  3. Prochaska J.X.
  4. Venn K.A.
  5. Dessauges-Zavadsky M.
  6. Published by
    CDS
Abstract

Using our sample of the most metal-rich damped Lyman {alpha} systems (DLAs) at z_abs_~2, and two literature compilations of chemical abundances in 341 DLAs and 2818 stars, we present an analysis of the chemical composition of DLAs in the context of the Local Group. The metal-rich sample of DLAs at z_abs~2 probes metallicities as high as the Galactic disc and the most metal-rich dwarf spheroidals (dSphs), permitting an analysis of many elements typically observed in DLAs (Fe, Zn, Cr, Mn, Si, and S) in comparison to stellar abundances observed in the Galaxy and its satellites (in particular dSphs). Our main conclusions are: (1) non-solar [Zn/Fe] abundances in metal-poor Galactic stars and in dSphs over the full metallicity range probed by DLAs, suggest that Zn is not a simple proxy for Fe in DLAs and therefore not a suitable indicator of dust depletion. After correcting for dust depletion, the majority of DLAs have subsolar [Zn/Fe] similar to dSphs; (2) at [Fe/H]~-0.5, a constant [Mn/Fe]~-0.5 and near-solar [{alpha}/Fe] (requiring an assumption about dust depletion) are in better agreement with dwarf galaxies than Galactic disc stars; (3) [{alpha}/Zn] is usually solar or subsolar in DLAs. However, although low ratios of [{alpha}/Fe] are usually considered more 'dwarf-like' than `Milky Way-like', subsolar [Zn/Fe] in Local Group dwarfs leads to supersolar [{alpha}/Zn] in the dSphs, in contrast with the DLAs. Therefore, whilst DLAs exhibit some similarities with the Local Group dwarf population, there are also notable differences.

Keywords
  1. galaxies
  2. quasars
  3. chemical-abundances
Bibliographic source Bibcode
2015MNRAS.452.4326B
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/452/4326
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/452/4326
Document Object Identifer DOI
doi:10.26093/cds/vizier.74524326

Access

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http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/452/4326
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/452/4326
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/452/4326
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http://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/452/4326/tablea1?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/452/4326/tablea1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/452/4326/tablea1?

History

2016-06-22T16:02:47Z
Resource record created
2016-06-22T16:02:47Z
Created
2024-08-15T20:14:43Z
Updated

Contact

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CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
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