J/A+A/682/A105ivo://CDS.VizieR/J/A+A/682/A105doi:10.26093/cds/vizier.36820105CDSPignataro G.V.Bonafede A.Bernardi G.Riseley C.J.Dallacasa D.,Venturi T.2024-11-28T20:06:05Z2024-02-07T09:30:56ZCDS support team

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

cds-question@unistra.frgalaxy-clustersinteracting-galaxiesradio-sourcesThe main purpose of this work is to investigate the properties of the non-thermal emission in the interacting clusters pairs Abell 0399-Abell 0401 and Abell 21-PSZ2 G114.9, found in an interacting state. In both cases their connection along a filament is supported by SZ effect detected by the Planck satellite and, in the special case of Abell 0399-Abell 0401, the presence of a radio bridge has been already confirmed by LOFAR observations at 140MHz. Here, we analyse new high sensitivity wideband (250-500MHz) uGMRT data of these two systems and describe an injection procedure to place limits on the spectrum of Abell 0399-Abell 0401 and on the radio emission between Abell 21-PSZ2 G114.9. For the A399-A401 pair, we are able to constrain the steep spectral index of the bridge emission to be alpha>2.2 with a 95% confidence level between 140MHz and 400MHz. For the A21-PSZ2 G114.9 pair, we are able to place an upper limit on the flux density of the bridge emission with two different methods, finding at the central frequency of 383MHz a conservative value of fu_1_<260mJy at 95% confidence level, and a lower value of fu_2_<125mJy at 80% confidence level, based on visual inspection and a morphological criterion. Our work provides a constraint on the spectrum in the bridge A399-A401 which disfavours shock-acceleration as the main mechanism for the radio emission.2024A&A...682A.105Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/682/A105CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/682/A105https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/682/A105http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/682/A105https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/682/A105https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/682/A105http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/682/A105GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/682/A105/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/682/A105/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/682/A105/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/682/A105/list?GETtext/xml+votable180.050000true5.2576428.380140.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/682/A1056/206 20302https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/682/A105?format=asciiRadiodefaultJ/A+A/682/A105/listList of fits imagesrecnoRecord 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;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar