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The oxygen abundance gradients in the gas discs of galaxies in the EAGLE simulation

Tissera, PB, Rosas-Guevara, Y, Bower, RG, Crain, RA, Lagos, CDP, Schaller, M, Schaye, J and Theuns, T (2018) The oxygen abundance gradients in the gas discs of galaxies in the EAGLE simulation. Monthly Notices of the Royal Astronomical Society, 482 (2). pp. 2208-2221. ISSN 0035-8711

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Abstract

We use the EAGLE simulations to study the oxygen abundance gradients of gas discs in galaxies within the stellar mass range [109.5, 1010.8] ∼M at z = 0. The estimated median oxygen gradient is −0.011 ± 0.002 dex kpc−1, which is shallower than observed. No clear trend between simulated disc oxygen gradient and galaxy stellar mass is found when all galaxies are considered. However, the oxygen gradient shows a clear correlation with gas disc size so that shallower abundance slopes are found for increasing gas disc sizes. Positive oxygen gradients are detected for ≈40 per cent of the analysed gas discs, with a slight higher frequency in low-mass galaxies. Galaxies that have quiet merger histories show a positive correlation between oxygen gradient and stellar mass, so that more massive galaxies tend to have shallowermetallicity gradients. At high stellarmass, there is a larger fraction of rotationaldominated galaxies in low-density regions. At low stellar mass, non-merger galaxies show a large variety of oxygen gradients and morphologies. The normalization of the disc oxygen gradients in non-merger galaxies by the effective radius removes the trend with stellar mass. Conversely, galaxies that experienced mergers show a weak relation between oxygen gradient and stellar mass. Additionally, the analysed EAGLE discs show no clear dependence of the oxygen gradients on local environment, in agreement with current observational findings.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 16 Jan 2019 11:26
Last Modified: 17 Jan 2019 21:31
DOI or Identification number: 10.1093/mnras/sty2817
URI: http://researchonline.ljmu.ac.uk/id/eprint/9955

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