dc.contributor.author | Rutkowski, Michael J. | |
dc.contributor.author | Jeong, Hyunjin | |
dc.contributor.author | Cohen, Seth H. | |
dc.contributor.author | Kaviraj, S. | |
dc.contributor.author | Windhorst, Rogier A. | |
dc.contributor.author | Ryan, Russell E. | |
dc.contributor.author | Koekemoer, Anton | |
dc.contributor.author | Yi, Sukyoung K. | |
dc.contributor.author | Hathi, Nimish P. | |
dc.contributor.author | Dopita, Michael A. | |
dc.date.accessioned | 2016-03-21T09:35:36Z | |
dc.date.available | 2016-03-21T09:35:36Z | |
dc.date.issued | 2014-12-01 | |
dc.identifier.citation | Rutkowski , 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.issn | 0004-637X | |
dc.identifier.other | ORCID: /0000-0002-5601-575X/work/77850146 | |
dc.identifier.uri | http://hdl.handle.net/2299/16842 | |
dc.description.abstract | We 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.format.extent | 668498 | |
dc.language.iso | eng | |
dc.relation.ispartof | The Astrophysical Journal | |
dc.subject | galaxies: elliptical and lenticular, cD | |
dc.subject | galaxies: evolution | |
dc.subject | galaxies: star formation | |
dc.subject | ultraviolet: galaxies | |
dc.subject | Nuclear and High Energy Physics | |
dc.title | Early-type galaxies at intermediate redshift observed with hubble space telescope WFC3 : Perspectives on recent star formation | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.contributor.institution | Centre for Astrophysics Research | |
dc.contributor.institution | Science & Technology Research Institute | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.1088/0004-637X/796/2/101 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |