J/A+A/659/A20ivo://CDS.VizieR/J/A+A/659/A20doi:10.26093/cds/vizier.36590020CDSIgnesti A.Brunetti G.Shimwell T.Gitti M.Birzan L.Botteon A.,Brueggen M.de Gasperin F.Di Gennaro G.Edge A.C.Riseley C.J.,Roettgering H.J.A.van Weeren R.J.2022-05-18T14:30:41Z2022-02-28T09:45:27ZCDS support team

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

cds-question@unistra.frgalaxy-clustersradio-sourcesRadio observations represent a powerful probe of the physics occurring in the intracluster medium (ICM) because they trace the relativistic cosmic rays in the cluster magnetic fields, or within galaxies themselves. By probing the low-energy cosmic rays, low-frequency radio observations are especially interesting because they unveil emission powered by low-efficiency particle acceleration processes, which are believed to play a crucial role in the origin of diffuse radio emission. We investigate the origin of the radio mini-halo at the center of the galaxy cluster 2A0335+096 and its connection to the central galaxy and the sloshing cool core. We also study the properties of the head-tail galaxy GB6 B0335+096 hosted in the cluster to explore the lifecycle of the relativistic electrons in its radio tails. We use new LOw Frequency ARray (LOFAR) observations from the LOFAR Two-meter Sky Survey at 144MHz to map the low-frequency emission with a high level of detail. The new data were combined with archival Giant Metrewave Radio Telescope and Chandra observations to carry out a multi-wavelength study. We have made the first measurement of the spectral index of the mini-halo ({alpha}=-1.2+/-0.1 between 144MHz and 1.4GHz) and the lobes of the central source ({alpha}=~-1.5+/-0.1 between 144 and 610MHz). Based on the low-frequency radio emission morphology with respect to the thermal ICM, we propose that the origin of the diffuse radio emission is linked to the sloshing of the cool core. The new data revealed the presence of a Mpc-long radio tail associated with GB6 B0335+096. The observed projected length is a factor 3 longer than the expected cooling length, with evidence of flattening in the spectral index trend along the tail. Therefore, we suggest that the electrons toward the end of the tail are kept alive by the ICM gentle re-acceleration.2022A&A...659A..20Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/659/A20CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/659/A20https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/659/A20http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/659/A20https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/659/A20https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/659/A20http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/659/A20GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/659/A20/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/659/A20/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/659/A20/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/659/A20/list?GETtext/xml+votable180.050000true54.708999.964020.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/659/A206/87https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/659/A20?format=asciiRadiodefaultJ/A+A/659/A20/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;obsnullableFreqObserved frequencyMHzem.freqfloatsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharAssocDataAssociated Data web pagemeta.ref.urlchar