MeerKAT discovery of a double radio relic and odd radio circle

• DOI: 10.48550/arxiv.2304.11784
• Publication Date: 2023-01-01
• Authors: B. Koribalski; A. Veronica; M. Brüggen; T. H. Reiprich; Klaus Dolag; Ian Heywood; H. Andernach; R.‐J. Dettmar; M. Hoeft; X. Zhang; Esra Bülbül; G. I. G. Józsa; Jayanne English; J. Saponara
• Keywords: Radio halo; X-shaped radio galaxy; Intracluster medium

We present the serendipitous discovery of a large double radio relic associated with merging galaxy cluster PSZ2 G277.93+12.34 and new odd circle, ORC J1027-4422, both found in deep MeerKAT 1.3 GHz wide-band data. The angular separation two arc-shaped relics is 16 arcmin or 2.6 Mpc for redshift z = 0.158. thin southern relic, which shows number ridges/shocks including one possibly moving inwards, has linear extent 1.64 Mpc. In contrast, northern about twice as wide, bright, but only largest size 0.66 Complementary SRG/eROSITA X-ray images reveal extended emission from hot intracluster gas between around narrow-angle tail (NAT) PMN J1033-4335 (z 0.153) located just east relic. No halo detected. morphologies NAT are also detected Australian Square Kilometer Array Pathfinder at 887.5 MHz, suggest same outward direction. J1027-4422 different part image makes it 4th known single ORC. It diameter 90" corresponding to 400 kpc tentative 0.3 remains undetected emission. discuss similarities mergers formation mechanisms ORCs relics, respectively.