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The LOFAR and JVLA view of the distant steep spectrum radio halo in MACS J1149.5+2223
Context. Radio halos and relics are Mpc-scale diffuse radio sources in galaxy clusters, which have a steep spectral index α > 1 (defined as S ∝ ν − α ). It has been proposed that halos and relics arise from particle acceleration induced by turbulence and weak shocks that are …