FRONTIER FIELDS: SUBARU WEAK-LENSING ANALYSIS OF THE MERGING GALAXY CLUSTER A2744

We present a weak-lensing analysis of the merging Frontier Fields (FF) cluster Abell. 2744 using new Subaru/Suprime-Cam imaging. The wide-field lensing mass distribution reveals this cluster is comprised of four distinct substructures. Simultaneously modeling the two-dimensional reduced shear field using a combination of a Navarro-Frenk-White (NFW) model for the main core and truncated NFW models for the subhalos, we determine their masses and locations. The total mass of the system is constrained as M-200c = (2.06 +/- 0.42) x 10(15) M-circle dot. The most massive clump is the southern component with M-200c (7.7 +/- 3.4) x 10(14) M-circle dot,M- followed by the western substructure (M-200c (4.5 +/- 2.0) x 10(14) M-circle dot and two smaller substructures to the northeast (M-200c (2.8 +/- 1.6) x 10(14) M-circle dot and northwest (M-200c (1.9 +/- 1.2) x 10(14) M-circle dot. The presence of the four substructures supports the picture of multiple mergers. Using a composite of hydrodynamical binary simulations we explain this complicated system without the need for a "slingshot" effect to produce the northwest X-ray interloper, as previously proposed. The locations of the substructures appear to be offset from both the gas (87(-28)(+34) arcsec, 90% CL) and the galaxies (72(-53)(+34) arcsec, 90% CL) in the case of the northwestern and western subhalos. To confirm or refute these findings, high resolution space-based observations extending beyond the current FF limited coverage to the west and northwestern area are essential.