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The time evolution of the Milky Way’s oxygen abundance gradient

Mollá, M; Díaz, Á I; Cavichia, O; Gibson, B K; Maciel, W J; Costa, R D D; Ascasibar, Y; Few, C G


M Mollá

Á I Díaz

O Cavichia

W J Maciel

R D D Costa

Y Ascasibar


We study the evolution of oxygen abundance radial gradients as a function of time for the Milky Way Galaxy obtained with our Mulchem chemical evolution model. We review the recent data of abundances for different objects observed in our Galactic disc. We analyse with our models the role of the growth of the stellar disc, as well as the effect of infall rate and star formation prescriptions, or the pre-enrichment of the infall gas, on the time evolution of the oxygen abundance radial distribution. We compute the radial gradient of abundances within the disk, and its corresponding evolution, taking into account the disk growth along time. We compare our predictions with the data compilation, showing a good agreement. Our models predict a very smooth evolution when the radial gradient is measured within the optical disc with a slight flattening of the gradient from ∼ −0.057 dex kpc −1 at z = 4 until values around ∼ −0.015 dex kpc −1 at z = 1 and basically the same gradient until the present, with small differences between models. Moreover, some models show a steepening at the last times, from z = 1 until z = 0 in agreement with data which give a variation of the gradient in a range from −0.02 to −0.04 dex kpc −1 from t = 10 Gyr until now. The gradient measured as a function of the normalized radius R/R eff is in good agreement with findings by CALIFA and MUSE, and its evolution with redshift falls within the error bars of cosmological simulations.

Journal Article Type Article
Publication Date Jan 21, 2019
Journal Mon. Not. R. Astron. Soc
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 482
Issue 3
Pages 3071–3088
Institution Citation Mollá, M., Díaz, Á. I., Cavichia, O., Gibson, B. K., Maciel, W. J., Costa, R. D. D., …Few, C. G. (2019). The time evolution of the Milky Way’s oxygen abundance gradient. Monthly notices, containing papers, abstracts of papers, and reports of the proceedings of the Society, 482(3), 3071–3088. doi:10.1093/mnras/sty2877
Keywords Galaxy: abundances; Galaxy: evolution; Galaxy: formation; Galaxy: disc
Publisher URL


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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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