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Some merging galaxy clusters host diffuse extended radio emission, so-calledradio halos and relics. Here we present observations between 147 MHz and 4.9GHz of a new radio-selected galaxy cluster 1RXS J0603.3+4214 (z=0.225). Thecluster is also detected as an extended X-ray source in the RASS. It hosts alarge bright 1.9 Mpc radio relic, an elongated ~2 Mpc radio halo, and twosmaller radio relics. The large radio relic has a peculiar linear morphology.For this relic we observe a clear spectral index gradient, in the directiontowards the cluster center. We performed Rotation Measure (RM) Synthesisbetween 1.2 and 1.7 GHz. The results suggest that for the west part of thelarge relic some of the Faraday rotation is caused by ICM and is not only dueto galactic foregrounds. We also carried out a detailed spectral analysis ofthis radio relic and created radio color-color diagrams. We find (i) aninjection spectral index of -0.6 to -0.7, (ii) steepening spectral index andincreasing spectral curvature in the post-shock region, and (iii) an overallpower-law spectrum between 74 MHz and 4.9 GHz with \alpha=-1.10 \pm 0.02.Mixing of emission in the beam from regions with different spectral ages isprobably the dominant factor that determines the shape of the radio spectra.Changes in the magnetic field, total electron content, or adiabaticgains/losses do not play a major role. A model in which particles are(re)accelerated in a first order Fermi process at the front of the relicprovides the best match to the observed spectra. We speculate that in thepost-shock region particles are re-accelerated by merger induced turbulence toform the radio halo as the relic and halo are connected. The 1RXS J0603.3+4214merger is probably more complex than the "simple'" binary merger events thatare thought to give rise to symmetric double radio relics.

The "toothbrush-relic": evidence for a coherent linear 2-Mpc scale shock wave in a massive merging galaxy cluster?