The evolution of the metallicity gradient and the star formation efficiency in disc galaxies

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dc.contributor.authorSillero, Emanuel
dc.contributor.authorTissera, Patricia B.
dc.contributor.authorLambas, Diego G.
dc.contributor.authorMichel-Dansac, Leo
dc.date.accessioned2023-09-27T15:35:50Z
dc.date.available2023-09-27T15:35:50Z
dc.date.issued2017-12
dc.descriptionIndexación: Scopuses
dc.description.abstractWe study the oxygen abundance profiles of the gas-phase components in hydrodynamical simulations of pre-prepared disc galaxies including major mergers, close encounters and isolated configurations. We analyse the evolution of the slope of oxygen abundance profiles and the specific star formation rate (sSFR) along their evolution. We find that galaxy-galaxy interactions could generate either positive or negative gas-phase oxygen profiles, depending on the state of evolution. Along the interaction, galaxies are found to have metallicity gradients and sSFR consistent with observations, on average. Strong gas inflows produced during galaxy- galaxy interactions or as a result of strong local instabilities in gas-rich discs are able to produce both a quick dilution of the central gas-phase metallicity and a sudden increase of the sSFR. Our simulations show that, during these events, a correlation between the metallicity gradients and the sSFR can be set up if strong gas inflows are triggered in the central regions in short time-scales. Simulated galaxies without experiencing strong disturbances evolve smoothly without modifying the metallicity gradients. Gas-rich systems show large dispersion along the correlation. The dispersion in the observed relation could be interpreted as produced by the combination of galaxies with different gas-richness and/or experiencing different types of interactions. Hence, our findings suggest that the observed relation might be the smoking gun of galaxies forming in a hierarchical clustering scenario. © 2017 The Authors.es
dc.description.urihttps://academic-oup-com.recursosbiblioteca.unab.cl/mnras/article/472/4/4404/4103564
dc.identifier.citationMonthly Notices of the Royal Astronomical Society Volume 472, Issue 4, Pages 4404 - 4413December 2017es
dc.identifier.doi10.1093/mnras/stx2265
dc.identifier.issn0035-8711
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/53343
dc.language.isoenes
dc.publisherOxford University Presses
dc.rights.licenseAtribución 4.0 Internacional (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.es
dc.subjectDark matteres
dc.subjectGalaxies: abundanceses
dc.subjectGalaxies: evolutiones
dc.titleThe evolution of the metallicity gradient and the star formation efficiency in disc galaxieses
dc.typeArtículoes
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