University of Tasmania
Browse

File(s) under permanent embargo

Reconciliation of damped Lyman α and H ιι region metallicities

journal contribution
posted on 2023-05-17, 07:49 authored by O'Rourke, DJP, Stanislav ShabalaStanislav Shabala, Alexander, P
We present a model of chemical evolution in disc galaxies, which extends our semi-analytic model for galaxy evolution. This semi-analytic framework has already been shown to reproduce the observed star formation histories. We take an open box approach which tracks the metallicity of two phases, the hot coronal gas and the cold gas making up the disc. Gaseous infall at primordial metallicities is constrained by analytic fits to N-body simulations and the model includes supernova and active galactic nuclei feedback.We address the differences between observedmetallicities obtained from H II data and fromdamped Lyman alpha absorbers and show that they may be explained by observational selection effects resulting from radial metallicity gradients, without having to resort to a separate population of galaxies. Within the framework describing these selection effects the cold disc gas of our chemical evolution model is shown to reproduce the metallicities of both the H II regions and the damped Lyman alpha absorbers. DLA metallicities are shown to be largely determined by dwarf galaxies especially at high redshifts.

History

Publication title

Monthly Notices of the Royal Astronomical Society

Volume

418

Issue

4

Pagination

2113-2816

ISSN

1365-2966

Department/School

School of Natural Sciences

Publisher

Wiley-Blackwell Publishing Ltd

Place of publication

United Kingdom

Rights statement

The definitive published version is available online at: http://www3.interscience.wiley.com/

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the physical sciences

Usage metrics

    University Of Tasmania

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC