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The investigation of merging galaxy clusters that exhibit radio relics isstrengthening our understanding of the formation and evolution of galaxyclusters, the nature of dark matter, the intracluster medium, and astrophysicalparticle acceleration. Each merging cluster provides only a single view of thecluster formation process and the variety of merging clusters is vast. Clustershosting double radio relics are rare and extremely important because they allowtight constraints on the merger scenario. We present a weak-lensing and X-rayanalysis of MACSJ1752.0+4440 ($z$=0.365) and ZWCL1856.8+6616 ($z$=0.304), twodouble radio relic clusters. Our weak-lensing mass estimates show that eachcluster is a major merger with approximately 1:1 mass ratio. The total mass ofMACSJ1752.0+4440 (ZWCL1856.8+6616) is $M_{200}=14.7^{+3.8}_{-3.3}\times10^{14}\$M$_\odot$ ($M_{200}=2.4^{+0.9}_{-0.7}\times10^{14}\ $M$_\odot$). We find thatthese two clusters have comparable features in their weak-lensing and gasdistributions, even though the systems have vastly different total masses. Fromthe likeness of the X-ray morphologies and the remarkable symmetry of the radiorelics, we propose that both systems underwent nearly head-on collisions.However, revelations from the hot-gas features and our multiwavelength dataanalysis suggest that ZWCL1856.8+6618 is likely at a later merger phase thanMACSJ1752.0+4440. We postulate that the SW radio relic in MACSJ1752.0+4440 is aresult of particle re-acceleration.

Exemplary Merging Clusters: Weak-lensing and X-ray Analysis of the Double Radio Relic Merging Galaxy Clusters MACS 1752.0+4440 and ZWCL 1856.8+6616