J/MNRAS/509/550ivo://CDS.VizieR/J/MNRAS/509/550doi:10.26093/cds/vizier.75090550CDSJeong H.Oh K.Joo S.-J.Yi S.K.2025-04-16T20:15:04Z2024-10-23T09:31:31ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxiesvisible-astronomyultraviolet-photometryredshiftedspectroscopyOn the basis of the Galaxy Evolution Explore (GALEX) ultraviolet (UV) data, many studies have demonstrated that recent star formation (RSF) is common in early-type galaxies. In particular, near-ultraviolet (NUV) light is used to investigate star formation activity in early-type galaxies, owing to its high sensitivity to the presence of young stars. This study characterized the stellar population properties of luminous early-type galaxies (Mr<=-20.65mag) in the redshift range 0.005>=z<=0.09 on the basis of the Sloan Digital Sky Survey (SDSS) data. Initially, the most frequently used criterion of NUV-r<=5.4 was applied to identify early-type galaxies with RSF, and 19 per cent (172/913) of the sample galaxies met this criterion, in agreement with previous studies. A more robust sample of galaxies with RSF along with a stricter criterion (70 galaxies with NUV-r<=5.0) were then used for further analysis, and consequently 7.7 per cent (70/913; lower limit of the RSF fraction) of the sample galaxies were classified as early-type galaxies with RSF. These galaxies tended to exhibit higher H{beta} absorption-line strengths and stronger emission lines than quiescent (QST, NUVr>5.4) early-type galaxies. The most prominent feature of early-type galaxies with RSF identified in this study was that they were more metal-poor than QST galaxies owing to metal-poor stellar populations that were possibly formed from materials accreted from gas-rich satellites during (minor) mergers or interactions. The results strongly indicate that the observed RSF in the sample galaxies at the present epoch is mainly driven by external processes (i.e. mergers or interactions).2022MNRAS.509..550Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/509/550CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/509/550https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/509/550http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/509/550https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/509/550https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/509/550http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/509/550GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/509/550/table2 (Properties of our recent star formation (RSF) early-type galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/509/550/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/509/550/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/509/550/table2?GETtext/xml+votable180.050000true358.966491940.55790.0055555555555555566/4122-4123 4236 4299 4312 5029 6209 7229 7314 7363 7509 7511 8203 8207 8220 8228 8330 9508 10105 10120 10221 17215 17251 17315 17317 17554 17665 17761 18003 18006 18075 18411 18524 18583 18611 18618 18775 18946 18948 19051 19417 19458 19704 25595 25913 25919 25952 25970 25972 26049 26068-26069 26099 26322 26384 27059 27225 27236 27339 27359 27378 27399 27402 31404 31423 31651 49120https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/509/550?format=asciiUVOpticaldefaultJ/MNRAS/509/550/table2Properties of our recent star formation (RSF) early-type galaxiesSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintobjIDSDSS object IDmeta.id;meta.mainRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainzRedshiftsrc.redshiftfloatrMAGAbsolute r magnitudemagphys.magAbsfloatu-ru-r colour indexmagphot.colorfloatFUV-rFUV-r colour indexmagphot.color;em.UV.100-200nm;em.opt.RfloatNUV-rNUV-r colour indexmagphot.color;em.UV.200-300nm;em.opt.RfloatHbH{beta} index0.1nmspect.indexfloat[MgFe]'Metallicity Index [MgFe]' (1)spect.indexfloatAgeAgeGyrtime.agefloat[Z/H]Abundance [Z/H]phys.abund.ZfloatSloanDisplay the online SDSS data for this objectmeta.ref.urlchar