The origin of dispersion in DLA metallicities

Irina Dvorkin, Joseph Silk, Elisabeth Vangioni, Patrick Petitjean, Keith A. Olive

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Recent chemical abundance measurements of damped Ly α absorbers (DLAs) revealed an intrinsic scatter in their metallicity of ~0.5 dex out to z ~ 5. In order to explore the origin of this scatter, we build a semi-analytic model which traces the chemical evolution of the interstellar matter in small regions of the Universe with different mean density, from over-to underdense regions. We showthat the different histories of structure formation in these regions, namely halo abundance, mass and stellar content, are reflected in the chemical properties of the protogalaxies, and in particular of DLAs. We calculate mean metallicity-redshift relations and show that the metallicity dispersion arising from this environmental effect amounts to ~0.25 dex and is an important contributor to the observed overall intrinsic scatter.

Original languageEnglish (US)
Pages (from-to)L36-L40
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume452
Issue number1
DOIs
StatePublished - Jun 26 2015

Keywords

  • Galaxies: star formation
  • ISM: abundances
  • Quasars: absorption lines

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