The gas metallicity gradient and the star formation activity of disc galaxies

Authors
Tissera, Patricia Beatriz; Pedrosa, Susana Elizabeth; Sillero, Emanuel; Vilchez, José M.
Publication Year
2016
Language
English
Format
article
Status
Published version
Description
We study oxygen abundance profiles of the gaseous disc components in simulatedgalaxies in a hierarchical universe. We analyse the disc metallicity gradients in relationto the stellar masses and star formation rates of the simulated galaxies. We find a trendfor galaxies with low stellar masses to have steeper metallicity gradients than galaxieswith high stellar masses at z ∼ 0. We also detect that the gas-phase metallicityslopes and the specific star formation rate (sSFR) of our simulated disc galaxies areconsistent with recently reported observations at z ∼ 0. Simulated galaxies with highstellar masses reproduce the observed relationship at all analysed redshifts and have anincreasing contribution of discs with positive metallicity slopes with increasing redshift.Simulated galaxies with low stellar masses a have larger fraction of negative metallicitygradients with increasing redshift. Simulated galaxies with positive or very negativemetallicity slopes exhibit disturbed morphologies and/or have a close neighbour. Weanalyse the evolution of the slope of the oxygen profile and sSFR for a gas-rich galaxygalaxyencounter, finding that this kind of events could generate either positive andnegative gas-phase oxygen profiles depending on their state of evolution. Our resultssupport claims that the determination of reliable metallicity gradients as a function ofredshift is a key piece of information to understand galaxy formation and set constrainson the subgrid physics.
Fil: Tissera, Patricia Beatriz. Universidad Andres Bello; Chile. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Pedrosa, Susana Elizabeth. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Sillero, Emanuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomia Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomia Teórica y Experimental; Argentina
Fil: Vilchez, José M.. Instituto de Astrofísica de Andalucía; España
Subject
GALAXIES ABUNDANCES
GALAXIES EVOLUTION
COSMOLOGY DARK MATTER
Astronomía
Ciencias Físicas
CIENCIAS NATURALES Y EXACTAS
Access level
Open access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/24180