J/A+A/661/A92ivo://CDS.VizieR/J/A+A/661/A92doi:10.26093/cds/vizier.36610092CDSBrienza M.Lovisari L.Rajpurohit K.Bonafede A.Gastaldello F.,Murgia M.Vazza F.Bonnassieux E.Botteon A.Brunetti G.Drabent A.,Hardcastle M.J.Pasini T.Riseley C.J.Rottgering H.J.A.Shimwell T.,Simionescu A.van Weeren R.J.2022-09-05T14:18:04Z2022-05-06T07:38:34ZCDS support team

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

cds-question@unistra.frradio-galaxiesgalaxy-clustersradio-continuum-emissionx-ray-sourcesJets from active galactic nuclei (AGN) are known to recurrently enrich their surrounding medium with mildly relativistic particles and magnetic fields. Here, we present a detailed multi-frequency analysis of the nearby (z=0.01646) galaxy group NGC 507. In particular, we present new high-sensitivity and high-spatial-resolution radio images in the frequency range 144-675 MHz obtained using Low Frequency Array (LOFAR) and upgraded Giant Metrewave Radio Telescope (uGMRT) observations. These reveal the presence of previously undetected diffuse radio emission with complex, filamentary morphology likely related to a previous outburst of the central galaxy. Based on spectral ageing considerations, we find that the plasma was first injected by the AGN 240-380Myr ago and is now cooling. Our analysis of deep archival X-ray Multi-Mirror Mission XMM-Newton data confirms that the system is dynamically disturbed, as previously suggested. We detect two discontinuities in the X-ray surface-brightness distribution (towards the east and south) tracing a spiral pattern, which we interpret as cold fronts produced by sloshing motions. The remarkable spatial coincidence observed between the newly detected arc-like radio filament and the southern concave X-ray discontinuity strongly suggests that the remnant plasma has been displaced by the sloshing motions on large scales. Overall, NGC 507 represents one of the clearest examples known to date in which a direct interaction between old AGN remnant plasma and the external medium is observed in a galaxy group. Our results are consistent with simulations that suggest that filamentary emission can be created by the cluster or group weather, disrupting AGN lobes and spreading their relativistic content into the surrounding medium.2022A&A...661A..92Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/661/A92CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/661/A92https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/661/A92http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/661/A92https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/661/A92https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/661/A92http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/661/A92GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/661/A92/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/661/A92/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/661/A92/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/661/A92/list?GETtext/xml+votable180.050000true20.9138733.241120.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/661/A926/2251https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/661/A92?format=asciiX-rayRadiodefaultJ/A+A/661/A92/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 frequencyMHzem.freqfloatnullablesizeSize 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