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dc.contributor.authorRutkowski, Michael J.
dc.contributor.authorJeong, Hyunjin
dc.contributor.authorCohen, Seth H.
dc.contributor.authorKaviraj, S.
dc.contributor.authorWindhorst, Rogier A.
dc.contributor.authorRyan, Russell E.
dc.contributor.authorKoekemoer, Anton
dc.contributor.authorYi, Sukyoung K.
dc.contributor.authorHathi, Nimish P.
dc.contributor.authorDopita, Michael A.
dc.date.accessioned2016-03-21T09:35:36Z
dc.date.available2016-03-21T09:35:36Z
dc.date.issued2014-12-01
dc.identifier.citationRutkowski , M J , Jeong , H , Cohen , S H , Kaviraj , S , Windhorst , R A , Ryan , R E , Koekemoer , A , Yi , S K , Hathi , N P & Dopita , M A 2014 , ' Early-type galaxies at intermediate redshift observed with hubble space telescope WFC3 : Perspectives on recent star formation ' , The Astrophysical Journal , vol. 796 , no. 2 , 101 . https://doi.org/10.1088/0004-637X/796/2/101
dc.identifier.issn0004-637X
dc.identifier.otherPURE: 9608021
dc.identifier.otherPURE UUID: c157993e-6bf6-4ce7-8798-8b1023bc22c6
dc.identifier.otherScopus: 84911204151
dc.identifier.otherORCID: /0000-0002-5601-575X/work/77850146
dc.identifier.urihttp://hdl.handle.net/2299/16842
dc.description.abstractWe present an analysis of the stellar populations of 102 visually selected early-type galaxies (ETGs) with spectroscopic redshifts (0.35 ≲ z ≲ 1.5) from observations in the Early Release Science program with the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST). We fit one- and two-component synthetic stellar models to the ETGs UV-optical-near-IR spectral energy distributions and find that a large fraction (∼40%) are likely to have experienced a minor (fYC ≲ 10% of stellar mass) burst of recent (tYC ≲ 1 Gyr) star formation. The measured age and mass fraction of the young stellar populations do not strongly trend with measurements of galaxy morphology. We note that massive (M > 1010.5 M ) recent star-forming ETGs appear to have larger sizes. Furthermore, high-mass, quiescent ETGs identified with likely companions populate a distinct region in the size-mass parameter space, in comparison with the distribution of massive ETGs with evidence of recent star formation (RSF). We conclude that both mechanisms of quenching star formation in disk-like ETGs and (gas-rich, minor) merger activity contribute to the formation of young stars and the size-mass evolution of intermediate redshift ETGs. The number of ETGs for which we have both HST WFC3 panchromatic (especially UV) imaging and spectroscopically confirmed redshifts is relatively small, therefore, a conclusion about the relative roles of both of these mechanisms remains an open question.en
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.subjectgalaxies: elliptical and lenticular, cD
dc.subjectgalaxies: evolution
dc.subjectgalaxies: star formation
dc.subjectultraviolet: galaxies
dc.subjectNuclear and High Energy Physics
dc.titleEarly-type galaxies at intermediate redshift observed with hubble space telescope WFC3 : Perspectives on recent star formationen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1088/0004-637X/796/2/101
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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