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dc.contributor.authorStott, John P.
dc.contributor.authorSobral, David
dc.contributor.authorSwinbank, A. M.
dc.contributor.authorSmail, Ian
dc.contributor.authorBower, Richard
dc.contributor.authorBest, Philip N.
dc.contributor.authorSharples, Ray M.
dc.contributor.authorGeach, James E.
dc.contributor.authorMatthee, Jorryt
dc.date.accessioned2017-09-15T14:09:51Z
dc.date.available2017-09-15T14:09:51Z
dc.date.issued2014-09-21
dc.identifier.citationStott , J P , Sobral , D , Swinbank , A M , Smail , I , Bower , R , Best , P N , Sharples , R M , Geach , J E & Matthee , J 2014 , ' A relationship between specific star formation rate and metallicity gradient within z ~ 1 galaxies from KMOS-HiZELS ' , Monthly Notices of the Royal Astronomical Society , vol. 443 , no. 3 , pp. 2695-2704 . https://doi.org/10.1093/mnras/stu1343
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 11127063
dc.identifier.otherPURE UUID: fd4310cb-e977-4df2-925a-be6943449163
dc.identifier.otherScopus: 84906061756
dc.identifier.urihttp://hdl.handle.net/2299/19423
dc.descriptionThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Author (s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
dc.description.abstractWe have observed a sample of typical z ~ 1 star-forming galaxies, selected from the HiZELS survey, with the new K-band Multi-Object Spectrograph (KMOS) near-infrared, multi-integral field unit instrument on the Very Large Telescope (VLT), in order to obtain their dynamics and metallicity gradients. The majority of our galaxies have a metallicity gradient consistent with being flat or negative (i.e. higher metallicity cores than outskirts). Intriguingly, we find a trend between metallicity gradient and specific star formation rate (sSFR), such that galaxies with a high sSFR tend to have relatively metal poor centres, a result which is strengthened when combined with data sets from the literature. This result appears to explain the discrepancies reported between different high-redshift studies and varying claims for evolution. From a galaxy evolution perspective, the trend we see would mean that a galaxy's sSFR is governed by the amount of metal-poor gas that can be funnelled into its core, triggered either by merging or through efficient accretion. In fact, merging may play a significant role as it is the starburst galaxies at all epochs, which have the more positive metallicity gradients. Our results may help to explain the origin of the fundamental metallicity relation, in which galaxies at a fixed mass are observed to have lower metallicities at higher star formation rates, especially if the metallicity is measured in an aperture encompassing only the central regions of the galaxy. Finally, we note that this study demonstrates the power of KMOS as an efficient instrument for large-scale resolved galaxy surveys.en
dc.format.extent10
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.subjectGalaxies: abundances
dc.subjectGalaxies: evolution
dc.subjectGalaxies: kinematics and dynamics
dc.subjectAstronomy and Astrophysics
dc.subjectSpace and Planetary Science
dc.titleA relationship between specific star formation rate and metallicity gradient within z ~ 1 galaxies from KMOS-HiZELSen
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionUniversity of Hertfordshire
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=84906061756&partnerID=8YFLogxK
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2014-09-21
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stu1343
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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