Radio relics radio emission from multishock scenario

Radio relics are giant ($\sim$Mpc) synchrotron sources that believed to be produced by the (re)acceleration of cosmic-ray electrons (CRe) shocks in intracluster medium. In this numerical study, we focus on possibility some radio may arise when undergo diffusive shock acceleration at multiple outskirts merging galaxy clusters. This multi-shock (MS) scenario appears viable produce CRe emit visible emission. We show have been shocked times develop an energy spectrum significantly differs from power-law expected case a single scenario. As consequence, emission generated is higher than only once. explored paper, two scenarios differ one order magnitude. particular MS scenario, simulated relic follows KGJP spectral shape, consistent with observation. Furthermore, large enough detectable current telescopes (e.g. LOFAR, JVLA).