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dc.contributor.authorKaviraj, S.
dc.contributor.authorSchawinski, K.
dc.contributor.authorDevriendt, J.E.G.
dc.contributor.authorFerreras, I.
dc.contributor.authorKhochfar, S.
dc.contributor.authorYoon, S.-J.
dc.contributor.authorYi, S.K.
dc.contributor.authorLee, Y.-W.
dc.contributor.authorDeharveng, J.-M.
dc.contributor.authorBoselli, A.
dc.contributor.authorDonas, J.
dc.contributor.authorMilliard, B.
dc.contributor.authorBarlow, T.
dc.contributor.authorConrow, T.
dc.contributor.authorForster, K.
dc.contributor.authorFriedman, P.G.
dc.contributor.authorMartin, D.C.
dc.contributor.authorMorrissey, P.
dc.contributor.authorSeibert, M.
dc.contributor.authorSmall, T.
dc.contributor.authorWyder, T.
dc.contributor.authorNeff, S.
dc.contributor.authorSchiminovich, D.
dc.contributor.authorBianchi, L.
dc.contributor.authorHeckman, T.
dc.contributor.authorSzalay, A.
dc.contributor.authorMadore, B.
dc.contributor.authorRich, R.M.
dc.date.accessioned2013-10-30T11:30:57Z
dc.date.available2013-10-30T11:30:57Z
dc.date.issued2007-12-01
dc.identifier.citationKaviraj , S , Schawinski , K , Devriendt , J E G , Ferreras , I , Khochfar , S , Yoon , S-J , Yi , S K , Lee , Y-W , Deharveng , J-M , Boselli , A , Donas , J , Milliard , B , Barlow , T , Conrow , T , Forster , K , Friedman , P G , Martin , D C , Morrissey , P , Seibert , M , Small , T , Wyder , T , Neff , S , Schiminovich , D , Bianchi , L , Heckman , T , Szalay , A , Madore , B & Rich , R M 2007 , ' UV-optical colors as probes of early-type galaxy evolution ' , Astrophysical Journal, Supplement Series , vol. 173 , no. 2 , pp. 619-642 . https://doi.org/10.1086/516633
dc.identifier.issn0067-0049
dc.identifier.otherPURE: 2065324
dc.identifier.otherPURE UUID: 659629c0-ad7c-4fd0-ac89-6699d58d57e1
dc.identifier.otherScopus: 39449090424
dc.identifier.urihttp://hdl.handle.net/2299/11922
dc.description.abstractWe have studied ∼2100 early-type galaxies in the SDSS DR3 which have been detected by the GALEX Medium Imaging Survey (MIS), in the redshift range O <z <0.1.1. Combining GALEXUV photometry with corollary optical data from the SDSS, we find that, at a 95% confidence level, at least ∼30% of galaxies in this sample have UV to optical colors consistent with some recent star formation within the last Gyr. In particular, galaxies with an NUV - r color less than 5.5 are very likely to have experienced such recent star formation, taking into account the possibility of a contribution to NUV flux from the UV upturn phenomenon. We find quantitative agreement between the observations and the predictions of a semianalytical ACDM hierarchical merger model and deduce that early-type galaxies in the redshift range 0 <z <0.11 have ∼ 1 % -3 % of their stellar mass in stars less than 1 Gyr old. The average age of this recently formed population is ∼300-500 Myr. We also find that "monolithically" evolving galaxies, where recent star formation can be driven solely by recycled gas from stellar mass loss, cannot exhibit the blue colors (NUV - r <5.5) seen in a significant fraction (∼30%) of our observed sample.en
dc.format.extent24
dc.language.isoeng
dc.relation.ispartofAstrophysical Journal, Supplement Series
dc.rightsOpen
dc.titleUV-optical colors as probes of early-type galaxy evolutionen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=39449090424&partnerID=8YFLogxK
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeSubmitted Version
dcterms.dateAccepted2007-12-01
rioxxterms.versionSMUR
rioxxterms.versionofrecordhttps://doi.org/10.1086/516633
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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