The evolution of the oxygen abundance radial gradient in the Milky Way Galaxy disk

Mollá, M.; Cavichia, O.; Costa, R. D. D.; Maciel, W. J.; Gibson, Brad K.; Díaz, Ángeles I.

doi:10.1017/s1743921317001697

Cited by 1 publication

(2 citation statements)

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“…This trend suggests that the oxygen content in the ISM is built up quickly, resulting in flat oxygen profiles (e.g. Pilkington et al 2012;Mollá et al 2017). This efficient star formation activity provides an interpretation to the overall weak (negative/positive) metallicity gradients found in the EAGLE discs.…”

Section: Disc Assembly and Merger Historymentioning

confidence: 99%

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

Tissera

Rosas-Guevara

Bower

et al. 2018

Monthly Notices of the Royal Astronomical Society

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We use the EAGLE simulations to study the oxygen abundance gradients of gas discs in galaxies within the stellar mass range [10 9.5 , 10 10.8 ] 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 shallower metallicity gradients. At high stellar mass, there is a larger fraction of rotational-dominated 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.

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Section: Disc Assembly and Merger Historymentioning

confidence: 99%

“…Cora 2006;De Lucia et al 2014). These approaches yield negative metallicity gradients in discs if the gas cools and collapses while conserving the angular momentum (Calura et al 2012;Mollá et al 2017).…”

Section: Introductionmentioning

confidence: 99%