J/AJ/125/2393ivo://CDS.VizieR/J/AJ/125/2393doi:10.26093/cds/vizier.51252393CDSMiller N.A.Owen F.N.Hill J.M.2023-04-06T16:50:55Z2005-12-20T20:49:55ZCDS support team

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

cds-question@unistra.frgalaxy-clustersradio-galaxiesredshiftedapparent-magnitudeAbell 2256 is a nearby (z~0.06), rich cluster of galaxies with fascinating observed properties across a range of wavelengths. Long believed to represent a cluster merger, recent X-ray and optical results have suggested that in addition to the primary cluster and subcluster there is evidence for a third, poorer system. We present wide-field high-sensitivity 1.4GHz VLA radio observations of Abell 2256 in conjunction with optical imaging and additional spectroscopy. Over 40 cluster radio galaxies are identified, with optical spectroscopy indicating the emission source (star formation or active galactic nucleus) for most of them. While the overall fraction of galaxies exhibiting radio emission is consistent with a large sample of other nearby clusters, we find an increase in the activity level of galaxies belonging to the third system (hereafter "the Group"). Specifically, the Group has relatively more star formation than both the primary cluster and main subcluster. The position of the Group is also coincident with the observed cluster radio relic. We suggest that the Group recently (0.3Gyr) merged with the primary cluster and that this merger, not the ongoing merger of the primary and the main subcluster, might be responsible for many of the unusual radio properties of Abell 2256. Furthermore, the greater star formation activity of the Group suggests that the infall of groups is an important driver of galaxy evolution in clusters.2003AJ....125.2393Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/125/2393CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/99 : Radial Velocities of Galaxies (Palumbo+ 1986)VII/193 : The CfA Redshift Catalogue, Version June 1995 (Huchra+ 1995)J/AJ/123/2261 : Radial velocities in A2256 (Berrington+, 2002)J/A+AS/127/117 : Kinematics of galaxies (Prugniel+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/125/2393https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/125/2393http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/125/2393https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/125/2393https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/125/2393http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/125/2393GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/125/2393/table1 (Galaxy Velocity Measurements)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/125/2393/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/125/2393/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/125/2393/table1?GETtext/xml+votable180.050000true251.9912578.8686110.005555555555555556Cone search capability for table J/AJ/125/2393/radio (Radio galaxies })https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/125/2393/radio?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/125/2393/radio?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/125/2393/radio?GETtext/xml+votable180.050000true253.2278.7747220.0055555555555555566/12115 12118 12121-12124 12145https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/125/2393?format=asciiOpticalRadiodefaultJ/AJ/125/2393/table1Galaxy Velocity MeasurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainczVelocity measurement from this studykm/sinte_czError in czkm/sintn_czComment on cz (1)charB02cz? Velocity measurement from Berrington et al., 2002, Cat. <J/AJ/123/2261>km/sintnullablee_B02cz? Error in czkm/sintnullableJ/AJ/125/2393/radioRadio galaxies }recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintaSimbad column added by the CDScharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.maincz? Velocity measurementkm/sintnullablee_cz? Error in czkm/sintnullabler_czReference for cz (1)charRcmagCousins R band magnitude (2)magfloatS1.4GHzThe 1.4GHz flux densitymJyfloatf_S1.4GHz[c] Flag on S1.4GHz (3)chare_S1.4GHzError in S1.4GHzmJyfloatSep? Angular separation with associated galaxyarcsecfloatnullablef_Sep[a] Indicates extended radio galaxy (ID = A, B, C, I; see Figs. 2-5)charIDIdentification (4)charClassClassification (5)charf_Class[a-f, ] Flag on Class (6)char