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dc.contributor.authorMcDermid, Richard M.
dc.contributor.authorAlatalo, Katherine
dc.contributor.authorBlitz, Leo
dc.contributor.authorBournaud, Frederic
dc.contributor.authorBureau, Martin
dc.contributor.authorCappellari, Michele
dc.contributor.authorCrocker, Alison F.
dc.contributor.authorDavies, Roger L.
dc.contributor.authorDavis, Timothy A.
dc.contributor.authorde Zeeuw, P. T.
dc.contributor.authorDuc, Pierre-Alain
dc.contributor.authorEmsellem, Eric
dc.contributor.authorKhochfar, Sadegh
dc.contributor.authorKrajnovic, Davor
dc.contributor.authorKuntschner, Harald
dc.contributor.authorMorganti, Raffaella
dc.contributor.authorNaab, Thorsten
dc.contributor.authorOosterloo, Tom
dc.contributor.authorSarzi, Marc
dc.contributor.authorScott, Nicholas
dc.contributor.authorSerra, Paolo
dc.contributor.authorWeijmans, Anne-Marie
dc.contributor.authorYoung, Lisa M.
dc.identifier.citationMcDermid , R M , Alatalo , K , Blitz , L , Bournaud , F , Bureau , M , Cappellari , M , Crocker , A F , Davies , R L , Davis , T A , de Zeeuw , P T , Duc , P-A , Emsellem , E , Khochfar , S , Krajnovic , D , Kuntschner , H , Morganti , R , Naab , T , Oosterloo , T , Sarzi , M , Scott , N , Serra , P , Weijmans , A-M & Young , L M 2015 , ' The Atlas 3D Project - XXX. Star formation histories and stellar population scaling relations of early-type galaxies ' , Monthly Notices of the Royal Astronomical Society , vol. 448 , no. 4 , pp. 3484-3513 .
dc.identifier.otherPURE: 162203979
dc.identifier.otherPURE UUID: 17c4c911-9d4a-483c-99b5-6248a9de6231
dc.identifier.otherBibCode: 2015arXiv150103723M
dc.identifier.otherWOS: 000351529500043
dc.identifier.otherORCID: /0000-0002-5908-6852/work/40233507
dc.identifier.otherScopus: 84930024376
dc.descriptionMC acknowledges support from a Royal Society University Research Fellowship. This work was supported by the rolling grants ‘Astrophysics at Oxford’ PP/E001114/1 and ST/H002456/1 and visitor grants PPA/V/S/2002/00553, PP/E001564/1, and ST/H504862/1 from the UK Research Councils. RLD acknowledges travel and computer grants from Christ Church, Oxford and support from the Royal Society in the form of a Wolfson Merit Award 502011.K502/jd. TN acknowledges support from the DFG Cluster of Excellence Origin and Structure of the Universe. MS acknowledges support from an STFC Advanced Fellowship ST/F009186/1. TAD acknowledges the support provided by an ESO fellowship. The research leading to these results has received funding from the European Community's Seventh Framework Programme (/FP7/2007-2013/) under grant agreement No. 229517. The authors acknowledge financial support from ESO. SK acknowledges support from the Royal Society Joint Projects Grant JP0869822. NS acknowledges support of Australian Research Council grant DP110103509en
dc.description.abstractWe present the stellar population content of early-type galaxies from the ATLAS3D survey. Using spectra integrated within apertures covering up to one effective radius, we apply two methods: one based on measuring line-strength indices and applying single stellar population (SSP) models to derive SSP-equivalent values of stellar age, metallicity, and alpha enhancement; and one based on spectral fitting to derive non-parametric star formation histories, mass-weighted average values of age, metallicity, and half-mass formation time-scales. Using homogeneously derived effective radii and dynamically determined galaxy masses, we present the distribution of stellar population parameters on the Mass Plane (MJAM, σe, Rmaje), showing that at fixed mass, compact early-type galaxies are on average older, more metal-rich, and more alpha-enhanced than their larger counterparts. From non-parametric star formation histories, we find that the duration of star formation is systematically more extended in lower mass objects. Assuming that our sample represents most of the stellar content of today's local Universe, approximately 50 per cent of all stars formed within the first 2 Gyr following the big bang. Most of these stars reside today in the most massive galaxies (>1010.5 M⊙), which themselves formed 90 per cent of their stars by z ∼ 2. The lower mass objects, in contrast, have formed barely half their stars in this time interval. Stellar population properties are independent of environment over two orders of magnitude in local density, varying only with galaxy mass. In the highest density regions of our volume (dominated by the Virgo cluster), galaxies are older, alpha-enhanced, and have shorter star formation histories with respect to lower density regions.
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.rightsThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, © 2015 The Authors, Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.en
dc.subjectGalaxies: abundancesen
dc.subjectGalaxies: elliptical and lenticular, cDen
dc.subjectGalaxies: evolutionen
dc.subjectGalaxies: stellar contenten
dc.subjectQC Physicsen
dc.subjectQB Astronomyen
dc.titleThe Atlas3D Project - XXX. Star formation histories and stellar population scaling relations of early-type galaxiesen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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