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Metallicity gradients in local field star-forming galaxies: Insights on inflows, outflows, and the coevolution of gas, stars and metals

Ho, I-Ting; Kudritzki, Rolf-Peter; Kewley, Lisa; Zahid, H.Jabran; Dopita, Michael; Bresolin, F; Rupke, D

Description

We present metallicity gradients in 49 local field star-forming galaxies. We derive gasphase oxygen abundances using two widely adopted metallicity calibrations based on the [O III]/Hβ, [NII]/Hα, and [N II]/[O II] line ratios. The two derived metallicity gradients are usually in good agreement within ±0.14 dexR25 -1 (R25 is the B-band iso-photoal radius), but the metallicity gradients can differ significantly when the ionization parameters change systematically with radius. We investigate the...[Show more]

dc.contributor.authorHo, I-Ting
dc.contributor.authorKudritzki, Rolf-Peter
dc.contributor.authorKewley, Lisa
dc.contributor.authorZahid, H.Jabran
dc.contributor.authorDopita, Michael
dc.contributor.authorBresolin, F
dc.contributor.authorRupke, D
dc.date.accessioned2018-11-29T22:53:33Z
dc.date.available2018-11-29T22:53:33Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/152505
dc.description.abstractWe present metallicity gradients in 49 local field star-forming galaxies. We derive gasphase oxygen abundances using two widely adopted metallicity calibrations based on the [O III]/Hβ, [NII]/Hα, and [N II]/[O II] line ratios. The two derived metallicity gradients are usually in good agreement within ±0.14 dexR25 -1 (R25 is the B-band iso-photoal radius), but the metallicity gradients can differ significantly when the ionization parameters change systematically with radius. We investigate the metallicity gradients as a function of stellar mass (8 < log (M*/M⊙) < 11) and absolute B-band luminosity (-16 > MB > -22). When the metallicity gradients are expressed in dex kpc-1, we show that galaxies with lower mass and luminosity, on average, have steeper metallicity gradients. When the metallicity gradients are expressed in dexR25 -1 (R25, we find no correlation between the metallicity gradients, and stellar mass and luminosity. We provide a local benchmark metallicity gradient of field star-forming galaxies useful for comparison with studies at high redshifts. We investigate the origin of the local benchmark gradient using simple chemical evolution models and observed gas and stellar surface density profiles in nearby field spiral galaxies. Our models suggest that the local benchmark gradient is a direct result of the coevolution of gas and stellar disc under virtually closed-box chemical evolution when the stellar-to-gas mass ratio becomes high (≫0.3). These models imply low current mass accretion rates (≲0.3 × SFR), and low-mass outflow rates (≲3 × SFR) in local field star-forming galaxies
dc.format.mimetypeapplication/pdf
dc.publisherBlackwell Publishing Ltd
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.titleMetallicity gradients in local field star-forming galaxies: Insights on inflows, outflows, and the coevolution of gas, stars and metals
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume448
dc.date.issued2015
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.ariespublicationa383154xPUB8604
local.type.statusPublished Version
local.contributor.affiliationHo, I-Ting, College of Science, ANU
local.contributor.affiliationKudritzki, Rolf-Peter, University of Hawaii
local.contributor.affiliationKewley, Lisa, College of Science, ANU
local.contributor.affiliationZahid, H.Jabran, Smithsonian Astrophysical Observatory
local.contributor.affiliationDopita, Michael, College of Science, ANU
local.contributor.affiliationBresolin, F, University of Hawaii
local.contributor.affiliationRupke, D, Rhodes College
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage2030
local.bibliographicCitation.lastpage2054
local.identifier.doi10.1093/mnras/stv067
dc.date.updated2018-11-29T07:53:23Z
local.identifier.scopusID2-s2.0-84929772715
local.identifier.thomsonID000351507000005
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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