J/MNRAS/419/687ivo://CDS.VizieR/J/MNRAS/419/687doi:10.26093/cds/vizier.74190687CDSRamos Almeida C.Bessiere P.S.Tadhunter C.N.Perez-Gonzalez P.G.,Barro G.Inskip K.J.Morganti R.Holt J.Dicken D.2024-07-16T20:12:24Z2016-02-10T14:46:40ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleigalaxy-classification-systemsWe present the results of a comparison between the optical morphologies of a complete sample of 46 southern 2Jy radio galaxies at intermediate redshifts (0.05<z<0.7) and those of two control samples of quiescent early-type galaxies: 55 ellipticals at redshifts z<=0.01 from the Observations of Bright Ellipticals at Yale (OBEY) survey, and 107 early-type galaxies at redshifts 0.2<z<0.7 in the Extended Groth Strip (EGS). Based on these comparisons, we discuss the role of galaxy interactions in the triggering of powerful radio galaxies (PRGs). We find that a significant fraction of quiescent ellipticals at low and intermediate redshifts show evidence for disturbed morphologies at relatively high surface brightness levels, which are likely the result of past or on-going galaxy interactions. However, the morphological features detected in the galaxy hosts of the PRGs (e.g. tidal tails, shells, bridges, etc.) are up to 2mag brighter than those present in their quiescent counterparts. Indeed, if we consider the same surface brightness limits, the fraction of disturbed morphologies is considerably smaller in the quiescent population (53% at z<0.2 and 48% at 0.2<=z<0.7) than in the PRGs (93% at z<0.2 and 95% at 0.2<=z<0.7 considering strong-line radio galaxies only). This supports a scenario in which PRGs represent a fleeting active phase of a subset of the elliptical galaxies that have recently undergone mergers/interactions. However, we demonstrate that only a small proportion (<~20%) of disturbed early-type galaxies are capable of hosting powerful radio sources.2012MNRAS.419..687Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/419/687CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/419/687https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/419/687http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/419/687https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/419/687https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/419/687http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/419/687GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/419/687/table1 (Full classification of the OBEY survey ordered by RA)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/419/687/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/419/687/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/419/687/table1?GETtext/xml+votable180.050000true22.83625-6.8680560.005555555555555556Cone search capability for table J/MNRAS/419/687/table2 (Full classification of the EGS sample ordered by Infrared Array Camera (IRAC) ID)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/419/687/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/419/687/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/419/687/table2?GETtext/xml+votable180.050000true215.37333352.9763890.0055555555555555566/8195-8196 11424-11425 11428 16898 17472 17606 17612 24681 24732-24733 24920 24951 25100 25383 25647 26055 26065 26125 26313 27079 27186 27714 27718-27719 34535 36152 36247 36621 36632 38347 38356 38693 38704 38842 40252 40321 43602 43626 43630 43669 43700 44000 44247 44995 45469 46035 46568 46608 46618 47190 47253 47386 47397 48160https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/419/687?format=asciiOpticaldefaultJ/MNRAS/419/687/table1Full classification of the OBEY survey ordered by RArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainzNED spectroscopic redshiftsrc.redshiftfloatBMAGAbsolute B magnitude (1)magphys.magAbs;em.opt.BfloatB-VB-V colour index (Vega) (2)magphot.color;em.opt.B;em.opt.VfloatObs.dateObservation datetime.epoch;obsnullableTcTidal parameter (3)src.morph.paramfloatMorphMorphological classification (G1)src.morphcharGroupGroup(s) (G2)meta.idcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/419/687/table2Full classification of the EGS sample ordered by Infrared Array Camera (IRAC) IDrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIRACIRAC ID (Rainbow data base identifier)meta.idintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainzphotPhotometric redshiftsrc.redshiftfloatBMAGAbsolute B magnitudemagphys.magAbs;em.opt.BfloatMu-MgRest-frame Mu-Mg colour from the Rainbow data basemagphot.color;em.opt;em.optfloatTypeIndicates whether a galaxy has been visually classified as an elliptical (E) or as a possible disc (PD)src.classcharMorphMorphological classification (G1)src.morphcharGroupGroup(s) (G2)meta.idcharSimbadNameSimbad column added by the CDSmeta.idchar