J/A+A/647/A3ivo://CDS.VizieR/J/A+A/647/A3doi:10.26093/cds/vizier.36470003CDSBrueggen M.Reiprich T.H.Bulbul E.Koribalski B.S.Andernach H.,Rudnick L.Hoang D.N.Wilber A.G.Duchesne S.W.Veronica A.,Pacaud F.Hopkins A.M.Norris R.P.Johnston-Hollitt M.Brown M.J.I.,Bonafede A.Brunetti G.Collier J.D.Sanders J.S.Vardoulaki E.,Venturi T.Kapinska A.D.Marvil J.2021-04-27T11:42:17Z2021-02-26T08:08:06ZCDS support team

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

cds-question@unistra.frgalaxy-clustersradio-sourcesThe pre-merging system of galaxy clusters Abell 3391-Abell 3395 located at a mean redshift of 0.053 has been observed at 1GHz in an ASKAP/EMU Early Science observation as well as in X-rays with eROSITA. The projected separation of the X-ray peaks of the two clusters is ~50{deg} or ~3.1Mpc. Here we present an inventory of interesting radio sources in this field around this cluster merger. While the eROSITA observations provide clear indications of a bridge of thermal gas between the clusters, neither ASKAP nor MWA observations show any diffuse radio emission coinciding with the X-ray bridge. We derive an upper limit on the radio emissivity in the bridge region of <J>_1GHz_<1.2x10^-44^W/H/m3. A non-detection of diffuse radio emission in the X-ray bridge between these two clusters has implications for particle-acceleration mechanisms in cosmological large-scale structure. We also report extended or otherwise noteworthy radio sources in the 30deg^2^ field around Abell 3391-Abell 3395. We identified 20 Giant Radio Galaxies, plus 7 candidates, with linear projected sizes greater than 1Mpc. The sky density of field radio galaxies with largest linear sizes of >0.7Mpc is ~1.7deg^2^, three times higher than previously reported. We find no evidence for a cosmological evolution of the population of Giant Radio Galaxies. Moreover, we find seven candidates for cluster radio relics and radio halos.2021A&A...647A...3Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/647/A3CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/647/A3https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/647/A3http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/647/A3https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/647/A3https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/647/A3http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/647/A3GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/647/A3/list (Information of fits image)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/647/A3/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/647/A3/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/647/A3/list?GETtext/xml+votable180.050000true89.6053-54.24090.0055555555555555566/33877https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/647/A3?format=asciiRadiodefaultJ/A+A/647/A3/listInformation of fits imagerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datestime.epoch;obsnullableFreqObserved frequencyGHzem.freqdoublesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar