J/AJ/125/2427ivo://CDS.VizieR/J/AJ/125/2427doi:10.26093/cds/vizier.51252427CDSMiller N.A.Owen F.N.2023-04-06T16:50:55Z2004-04-19T21:56:33ZCDS support team

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

cds-question@unistra.frgalaxy-clustersradio-galaxiesradial-velocityDeep VLA 1.4GHz radio continuum imaging of Abell 2255 is presented. This cluster is among the better nearby candidates for rich cluster-cluster merger systems, with evidence including an elongated X-ray morphology, the presence of a radio halo, and substructure present in its galaxy distribution. Our radio observations reach an rms sensitivity of ~40{mu}Jy/beam, enabling us to detect (at 5{sigma}) star formation rates as low as 1.4M_{sun}_/yr from the center of the cluster out to a radial distance of 3h^-1^_75_Mpc. The radio data are complemented by optical imaging and a large spectroscopic database, allowing us to separate all galaxies with M_Rc_<=-20 0 into cluster members and foreground/background galaxies. The spectra are also used to associate the galaxies' radio emission with either star formation or active galactic nuclei (AGNs). We compare the resulting cluster radio galaxy population with those of 19 other nearby Abell clusters and find strong evidence for an increase in the frequency of radio galaxies in Abell 2255. This increase is seen in two separate types of galaxies: powerful radio AGNs and optically faint star-forming galaxies. The optical spectra of the latter often indicate current or recent starbursts, and these galaxies appear to be distributed along an axis perpendicular to the probable merger axis. We assess these factors in light of models of galaxy evolution and suggest that the cluster-cluster merger is responsible for triggering galaxy activity in Abell 2255.2003AJ....125.2427Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/125/2427CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/123/567 : SDSS quasar catalog, I: Early Data Release (Schneider+, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/125/2427https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/125/2427http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/125/2427https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/125/2427https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/125/2427http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/125/2427GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/125/2427/table1 (Cluster radio galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/125/2427/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/125/2427/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/125/2427/table1?GETtext/xml+votable180.050000true257.23208363.6986110.005555555555555556Cone search capability for table J/AJ/125/2427/table2 (Additional radio galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/125/2427/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/125/2427/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/125/2427/table2?GETtext/xml+votable180.050000true256.59458364.0663890.0055555555555555566/11589-11591 11596-11597 11602https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/125/2427?format=asciiOpticalRadiodefaultJ/AJ/125/2427/table1Cluster radio galaxiesDistRadial distance (2)Mpcpos.distancefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0) (G1)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0) (G1)pos.eq.dec;meta.mainczHeliocentric radial velocity (1)km/sphys.veloc;pos.heliocentricinte_czrms uncertainty on czkm/sstat.errorintRcmagCousins R magnitude, calculated for the Gunn-Oke aperture, with an error of <~0.05magmagphot.mag;em.opt.RfloatS1.4GHzFlux density at 1.4GHzmJyphot.flux.density;em.radio.750-1500MHzfloate_S1.4GHzrms uncertainty on S1.4GHzmJystat.errorfloatSep? Separation betwen optical and radio emissionarcsecpos.angDistancefloatnullablen_Sep[c] Note on Sep (3)meta.notecharClassClassification (4)src.classcharn_Class[b] Note on Class (5)meta.notecharMorphMorphologysrc.morph.typecharn_MorphNote on Morph (6)meta.notecharJ/AJ/125/2427/table2Additional radio galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0) (G1)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0) (G1)pos.eq.dec;meta.mainczHeliocentric radial velocity (1)km/sphys.veloc;pos.heliocentricintn_czReference and notes for cz (2)meta.notechare_czrms uncertainty on czkm/sstat.errorintRcmag? Cousins R magnitude, calculated for the Gunn-Oke aperture, with an error of <~0.05magmagphot.mag;em.opt.RfloatnullableS1.4GHzFlux density at 1.4GHzmJyphot.flux.density;em.radio.750-1500MHzfloate_S1.4GHzrms uncertainty on S1.4GHzmJystat.errorfloatSep? Separationarcsecpos.angDistancefloatnullableClassClassification (3)src.classcharNotesNotes (4)meta.notechar