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We present a multiwavelength analysis of a sample of four hot (T_X>8keV)X-ray galaxy clusters (A1689, A2261, A2142, and A2390) using joint AMiBASunyaev-Zel'dovich effect (SZE) and Subaru weak lensing observations, combinedwith published X-ray temperatures, to examine the distribution of mass and theintracluster medium (ICM) in massive cluster environments. Our observationsshow that A2261 is very similar to A1689 in terms of lensing properties. Manytangential arcs are visible around A2261, with an effective Einstein radius\sim 40 arcsec (at z \sim 1.5), which when combined with our weak lensingmeasurements implies a mass profile well fitted by an NFW model with a highconcentration c_{vir} \sim 10, similar to A1689 and to other massive clusters.The cluster A2142 shows complex mass substructure, and displays a shallowerprofile (c_{vir} \sim 5), consistent with detailed X-ray observations whichimply recent interaction. The AMiBA map of A2142 exhibits an SZE featureassociated with mass substructure lying ahead of the sharp north-west edge ofthe X-ray core suggesting a pressure increase in the ICM. For A2390 we obtainhighly elliptical mass and ICM distributions at all radii, consistent withother X-ray and strong lensing work. Our cluster gas fraction measurements,free from the hydrostatic equilibrium assumption, are overall in good agreementwith published X-ray and SZE observations, with the sample-averaged gasfraction of <f_{gas}> = 0.133 \pm 0.027, for our sample <M_{vir}> = (1.2 \pm0.1) \times 10^{15} M_{sun} h^{-1}. When compared to the cosmic baryon fractionf_b = \Omega_b/\Omega_m constrained by the WMAP 5-year data, this indicates<f_{gas}>/f_b = 0.78 \pm 0.16, i.e., (22 \pm 16)% of the baryons are missingfrom the hot phase of clusters.

Mass and Hot Baryons in Massive Galaxy Clusters from Subaru Weak Lensing and AMiBA SZE Observations