J/A+A/599/A95ivo://CDS.VizieR/J/A+A/599/A95doi:10.26093/cds/vizier.35990095CDSGobat R.Daddi E.Strazzullo V.Garilli B.Mignoli M.Ma Z.Jin S.,Maraston C.Bethermin M.Cappellari M.Carollo M.Cimatti A.,Feruglio C.Moresco M.Onodera M.Pozzetti L.Renzini A.Valentino F.,Zanella A.2017-06-21T08:22:38Z2017-03-06T07:37:55ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyWe present a sample of 34 spectroscopically confirmed BzK-selected ~10^11^M_{sun}_ quiescent galaxies (pBzK) in the COSMOS field. The targets were initially observed with VIMOS on the VLT to facilitate the calibration of the photometric redshifts of massive galaxies at z>~1.5. Here we describe the reduction and analysis of the data, and the spectrophotometric properties of these pBzK galaxies. In particular, using a spatially resolved median 2D spectrum, we find that the fraction of stellar populations with ages <1Gyr is at least 3 times higher in the outer regions of the pBzK galaxies than in their cores. This results in a mild age gradient of {DELTA}age<=0.4Gyr over ~6kpc and suggests either the occurrence of widespread rejuvenation episodes or that inside-out quenching played a role in the passivization of this galaxy population. We also report on low-level star formation rates derived from the [OII]3727{AA} emission line, with SFR_OII_~3.7-4.5M_{sun}_/yr. This estimate is confirmed by an independent measurement on a separate sample of similarly-selected quiescent galaxies in the COSMOS field, using stacked far-infrared data (SFR_FIR_~2-4M_{sun}_/yr). This second, photometric sample also displays significant excess at 1.4GHz, suggestive of the presence of radio-mode AGN activity.2017A&A...599A..95Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/599/A95CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/599/A95https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/599/A95http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/599/A95https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/599/A95https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/599/A95http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/599/A95GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/599/A95/table1Median 1D VIMOS spectrum of z~1.5 ETGsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaRest-frame wavelength0.1nmem.wlfloatFluxFlux, F(lambda) (1)phot.fluxfloate_FluxStandard error on Flux (1)stat.error;phot.fluxfloat