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We present a weak-lensing analysis of the galaxy cluster CL J1226+3332 atz=0.89 using Hubble Space Telescope Advanced Camera for Surveys images. Thecluster is the hottest (>10 keV), most X-ray luminous system at z>0.6 known todate. The relaxed X-ray morphology, as well as its high temperature, is unusualat such a high redshift. Our mass reconstruction shows that on a large scalethe dark matter distribution is consistent with a relaxed system with nosignificant substructures. However, on a small scale the cluster core isresolved into two mass clumps highly correlated with the cluster galaxydistribution. The dominant mass clump lies close to the brightest clustergalaxy whereas the other less massive clump is located ~40" (~310 kpc) to thesouthwest. Although this secondary mass clump does not show an excess in theX-ray surface brightness, the gas temperature of the region is much higher(12~18 keV) than those of the rest. We propose a scenario in which the lessmassive system has already passed through the main cluster and the X-ray gashas been stripped during this passage. The elongation of the X-ray peak towardthe southwestern mass clump is also supportive of this possibility. We measuresignificant tangential shears out to the field boundary (~1.5 Mpc), which arewell described by an Navarro-Frenk-White profile with a concentration parameterof c200=2.7+-0.3 and a scale length of rs=78"+-19" (~600 kpc) withchi^2/d.o.f=1.11. Within the spherical volume r200=1.6 Mpc, the total mass ofthe cluster becomes M(r<r200)=(1.4+-0.2) x 10^15 solar mass. Our weak-lensinganalysis confirms that CL1226+3332 is indeed the most massive cluster known todate at z>0.6.

Dark Matter in the Galaxy Cluster CL J1226+3332 at Z=0.89