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The advent of high-resolution imaging of galaxy clusters using theSunyaev-Zel'dovich Effect (SZE) provides a unique probe of the astrophysics ofthe intracluster medium (ICM) out to high redshifts. To investigate the effectsof cluster mergers on resolved SZE images, we present a high-resolutioncosmological simulation of a 1.5E15 M_sun adiabatic cluster using the TreeSPHcode ChaNGa. This massive cluster undergoes a 10:3:1 ratio triple mergeraccompanied by a dramatic rise in its integrated Compton-Y, peaking at z =0.05. By modeling the thermal SZE (tSZ) and kinetic SZE (kSZ) spectraldistortions of the Cosmic Microwave Background (CMB) at this redshift withrelativistic corrections, we produce various mock images of the cluster atfrequencies and resolutions achievable with current high-resolution SZEinstruments. The two gravitationally-bound merging subclusters account for 10%and 1% of the main cluster's integrated Compton-Y, and have extended mergershock features in the background ICM visible in our mock images. We show thatalong certain projections and at specific frequencies, the kSZ CMB intensitydistortion can dominate over the tSZ due to the large line of sight velocitiesof the subcluster gas and the unique frequency-dependence of these effects. Weestimate that a one-velocity assumption in estimation of line of sightvelocities of the merging subclusters from the kSZ induces a bias of ~10%. Thisvelocity bias is small relative to other sources of uncertainty inobservations, partially due to helpful bulk motions in the background ICMinduced by the merger. Our results show that high-resolution SZE observations,which have recently detected strong kSZ signals in subclusters of mergingsystems, can robustly probe the dynamical as well as the thermal state of theICM.

The Observable Thermal and Kinetic Sunyaev-Zel'dovich Effect in Merging Galaxy Clusters