X-ray Shock Characterization in the Double Radio Relic Cluster MACSvirgulJ1752+4440

We propose a 122 ks XMMNewton observation of the merging galaxy cluster MACSJ1752+4440. The system is characterized by remarkable double bullets in Xrayand the symmetric giant double radio relics, which together indicate ahighspeed postmerger resembling the Bullet Cluster, however, observed at alater phase. This unique combination offers a rare opportunity to addresslongstanding puzzles in cluster mergers including generation/propagation ofplasma shocks and particle acceleration. The observation will enable us to 1)measure Xray shocks at the location of the relics, 2) reveal thermodynamicproperties of the double bullets, 3) constrain the merger scenario, and 4)quantify the reacceleration efficiency of diffusive shock acceleration. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]