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The galaxy cluster RX J0603.3+4214 at z=0.225 is one of the rarest clustersboasting an extremely large (~2 Mpc) radio-relic. Because of the remarkablemorphology of the relic, the cluster is nicknamed "Toothbrush Cluster".Although the cluster's underlying mass distribution is one of the criticalpieces of information needed to reconstruct the merger scenario responsible forthe puzzling radio-relic morphology, its proximity to the Galactic plane b~10deg has imposed significant observational challenges. We present ahigh-resolution weak-lensing study of the cluster with Subaru/Suprime Cam andHubble Space Telescope imaging data. Our mass reconstruction reveals that thecluster is comprised of complicated dark matter substructures closely tracingthe galaxy distribution, however in contrast with the relatively simple binaryX-ray morphology. Nevertheless, we find that the cluster mass is stilldominated by the two most massive clumps aligned north-south with a ~3:1 massratio (M_{200}=6.29_{-1.62}^{+2.24} x 10^{14} Msun and 1.98_{-0.74}^{+1.24} x10^{14} Msun for the northern and southern clumps, respectively). The southernmass peak is ~2' offset toward the south with respect to the correspondingX-ray peak, which has a "bullet"-like morphology pointing south. Comparison ofthe current weak-lensing result with the X-ray, galaxy, and radio-relicsuggests that perhaps the dominant mechanism responsible for the observed relicmay be a high-speed collision of the two most massive subclusters, although thepeculiarity of the morphology necessitates involvement of additionalsub-clusters. Careful numerical simulations should follow in order to obtainmore complete understanding of the merger scenario utilizing all existingobservations.

MC^2: Mapping the Dark Matter Distribution of the "Toothbrush" Cluster RX J0603.3+4214 with Hubble Space Telescope and Subaru Weak-lensing