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CIZA J2242.8+5301 is a merging system with a prominent (~2 Mpc long) radiorelic, which together with the morphology of the X-ray emission provides strongevidence for a violent collision along the N-S axis. We present our constraintson the dark matter distribution of this unusual system using Subaru and CFHTimaging data. Measuring a high S/N lensing signal from this cluster ispotentially a challenging task because of its proximity to the Milky Way plane(|b|~5 deg). We overcome this challenge with careful observation planning andsystematics control, which enables us to successfully map the dark matterdistribution of the cluster with high fidelity. The resulting mass map showsthat the mass distribution is highly elongated along the N-S merger axisinferred from the orientation of the radio relics. Based on our massreconstruction, we identify two sub-clusters, which coincide with the clustergalaxy distributions. We determine their masses using MCMC analysis bysimultaneously fitting two NFW halos without fixing their centroids. Theresulting masses of the northern and southern systems are$M_{200}=11.0_{-3.2}^{+3.7}\times10^{14} M_{\sun}$ and$9.8_{-2.5}^{+3.8}\times10^{14} M_{\sun}$, respectively, indicating that we arewitnessing a post-collision of two giant systems of nearly equal mass. When themass and galaxy centroids are compared in detail, we detect ~ 1' (~190 kpc)offsets in both northern and southern sub-clusters. We find that the galaxyluminosity-mass offset for the northern clump is statistically significant atthe ~2 sigma level whereas the detection is only marginal for the southernsub-cluster in part because of a relatively large mass centroid error. Weconclude that it is yet premature to uniquely attribute the galaxy-massmisalignment to SIDM and discuss caveats.

MC^2: Constraining the Dark Matter Distribution of the Violent Merging Galaxy Cluster CIZA J2242.8+5301 by Piercing through the Milky Way