J/A+A/666/A8ivo://CDS.VizieR/J/A+A/666/A8doi:10.26093/cds/vizier.36660008CDSStuardi C.Bonafede A.Rajpurohit K.Brueggen M.de Gasperin F.,Hoang D.van Weeren R.J.. Vazza F.2023-07-03T14:12:01Z2022-09-27T10:56:54ZCDS support team

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

cds-question@unistra.frgalaxy-clustersradio-sourcespolarimetryRadio relics are Mpc-size synchrotron sources located in the outskirts of some merging galaxy clusters. Binary-merging systems with favorable orientation may host two almost symmetric relics, named double radio relics. Double radio relics are seen preferentially edge-on and, thus, constitute a privileged sample for statistical studies. Their polarization and Faraday rotation properties give direct access to the relics origin and magnetic fields. In this paper, we present a polarization and Rotation Measure (RM) synthesis study of four clusters hosting double radio relics, namely 8C 0212+703, Abell 3365, PLCK G287.0+32.9, previously missing polarization studies, and ZwCl 2341+0000, for which conflicting results have been reported. We used 1-2GHz Karl G. Jansky Very Large Array observations. We also provide an updated compilation of known double radio relics with important observed quantities. We studied their polarization and Faraday rotation properties at 1.4GHz and we searched for correlations between fractional polarization and physical resolution, distance from the cluster center, and shock Mach number. The weak correlations found between these quantities are well reproduced by state-of-the-art magneto-hydrodynamical simulations of radio relics, confirming that merger shock waves propagate in a turbulent medium with tangled magnetic fields. Both external and internal Faraday depolarization should play a fundamental role in determining the polarization properties of radio relics at 1.4GHz. Although the number of double radio relics with RM information is still low, their Faraday rotation properties (i.e., rest-frame RM and RM dispersion below 40rad/m^2^ and non-Gaussian RM distribution) can be explained in the scenario in which shock waves with Mach numbers larger than 2.5 propagate along the plane of the sky and compress the turbulent intra-cluster medium.2022A&A...666A...8Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/666/A8CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/666/A8https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/666/A8http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/666/A8https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/666/A8https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/666/A8http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/666/A8GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/666/A8/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/666/A8/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/666/A8/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/666/A8/list?GETtext/xml+votable180.050000true34.7079270.459580.0055555555555555566/3703 3709 18779 21061 21072 24733https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/666/A8?format=asciiRadiodefaultJ/A+A/666/A8/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;obsnullableFreq? Observed frequencyGHzem.freqfloatnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar