SDSS-IV MaNGA: environmental dependence of gas metallicity gradients in local star-forming galaxies

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dc.contributor.authorLian, Jianhui
dc.contributor.authorThomas, Daniel
dc.contributor.authorLi, Cheng
dc.contributor.authorZheng, Zheng
dc.contributor.authorMaraston, Claudia
dc.contributor.authorBizyaev, Dmitry
dc.contributor.authorLane, Richard R.
dc.contributor.authorYan, Renbin
dc.date.accessioned2025-01-23T21:10:43Z
dc.date.available2025-01-23T21:10:43Z
dc.date.issued2019
dc.description.abstractWithin the standard model of hierarchical galaxy formation in a Lambda cold dark matter universe, the environment of galaxies is expected to play a key role in driving galaxy formation and evolution. In this paper, we investigate whether and how the gas metallicity and the star formation surface density (Sigma(SFR)) depend on galaxy environment. To this end, we analyse a sample of 1162 local, star-forming galaxies from the galaxy survey Mapping Nearby Galaxies at APO (MaNGA). Generally, both parameters do not show any significant dependence on environment. However, in agreement with previous studies, we find that low-mass satellite galaxies are an exception to this rule. The gas metallicity in these objects increases while their Sigma(SFR) decreases slightly with environmental density. The present analysis of MaNGA data allows us to extend this to spatially resolved properties. Our study reveals that the gas metallicity gradients of low-mass satellites flatten and their Sigma(SFR) gradients steepen with increasing environmental density. By extensively exploring a chemical evolution model, we identify two scenarios that are able to explain this pattern: metal-enriched gas accretion or pristine gas inflow with varying accretion time-scales. The latter scenario better matches the observed Sigma(SFR) gradients, and is therefore our preferred solution. In this model, a shorter gas accretion time-scale at larger radii is required. This suggests that 'outside-in quenching' governs the star formation processes of low-mass satellite galaxies in dense environments.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stz2218
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stz2218
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/100855
dc.identifier.wosidWOS:000489292800108
dc.issue.numero1
dc.language.isoen
dc.pagina.final1450
dc.pagina.inicio1436
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectgalaxies: evolution
dc.subjectgalaxies: fundamental parameters
dc.subjectgalaxies: star formation
dc.titleSDSS-IV MaNGA: environmental dependence of gas metallicity gradients in local star-forming galaxies
dc.typeartículo
dc.volumen489
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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