The toothbrush-relic: evidence for a coherent 3-Mpc scale shock wave questionMark

Recently, we have discovered an amzing 3 Mpc radio relic. Its coherent linearmorphology and enormous size are very difficult to understand in the standardscenario that relics trace shocks in the ICM induced by massive cluster mergers.With our proposed observations we will determine (i) the presence of shock wavesand their properties, (ii) the number of merging subclusters and dynamicalstate of the cluster, and (iii) the temperature structure of the ICM. This willallow us then to address the following questions: (1) are we witnessing a veryspecial configuration consisting of multiple merging events that collectivelyconspire to yield a linear structure? (2) is there a compelling need for a moresophisticated particle acceleration mechanism? truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]