Radio relics in PSZ2 G096.88+24.18: a connection with pre-existing plasma

ABSTRACT Giant radio relics are arc-like structures of diffuse, non-thermal synchrotron radiation that trace shock waves induced by galaxy cluster mergers. The particle (re-)acceleration mechanism producing such is unclear. One major open question whether can be formed directly from a population thermal seed electrons, or if pre-existing relativistic electrons required. In some cases, active galactic nuclei (AGNs) provide sub-GeV electrons. However, it unclear how common this connection is. paper, we present LOFAR 140 MHz and Very Large Array L-band observations, as well Chandra data PSZ2 G096.88+24.18, merging system hosting pair relics. A large patch diffuse emission connects bright with one the relics, likely affecting properties relic. We find most plausible explanation for merger wave has passed over an AGN lobe. passing led to increased brightness in relic only region filled