eCite Digital Repository
Reconciliation of damped Lyman α and H ιι region metallicities
Citation
O'Rourke, DJP and Shabala, SS and Alexander, P, Reconciliation of damped Lyman α and H ιι region metallicities, Monthly Notices of the Royal Astronomical Society, 418, (4) pp. 2113-2816. ISSN 1365-2966 (2011) [Refereed Article]
![]() | PDF Restricted - Request a copy 626Kb |
Copyright Statement
The definitive published version is available online at: http://www3.interscience.wiley.com/
DOI: doi:10.1111/j.1365-2966.2011.19343.x
Abstract
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.
Item Details
Item Type: | Refereed Article |
---|---|
Keywords: | galaxies, chemical evolution, DLA |
Research Division: | Physical Sciences |
Research Group: | Astronomical sciences |
Research Field: | Astronomical sciences not elsewhere classified |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the physical sciences |
UTAS Author: | Shabala, SS (Associate Professor Stas Shabala) |
ID Code: | 72585 |
Year Published: | 2011 |
Web of Science® Times Cited: | 3 |
Deposited By: | Mathematics and Physics |
Deposited On: | 2011-08-29 |
Last Modified: | 2017-11-03 |
Downloads: | 0 |
Repository Staff Only: item control page