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We investigate a non-equilibrium ionization state and an electron-iontwo-temperature structure of the intracluster medium (ICM) in merging galaxyclusters using a series of N-body and hydrodynamic simulations. Mergers withvarious sets of mass ratios and impact parameters are systematicallyinvestigated, and it is found that, in most cases, ICM significantly departsfrom the ionization equilibrium state at the shock layers with a Mach number of~1.5-2.0 in the outskirts of the clusters, and the shock layers with a Machnumber of ~2-4 in front of the ICM cores. Accordingly, the intensity ratiobetween Fe xxv and Fe xxvi K alpha line emissions is significantly altered fromthat in the ionization equilibrium state. If the effect of the two-temperaturestructure of ICM is incorporated, the electron temperature is ~10-20 % and~30-50 % lower than the mean temperature of ICM at the shock layers in theoutskirts and in front of the ICM cores, respectively, and the deviation fromthe ionization equilibrium state becomes larger. We also address the dependenceof the intensity ratio on the viewing angle with respect to the merging plane.

Hydrodynamic Simulations of Merging Galaxy Clusters: Non-Equilibrium Ionization State and Two-Temperature Structure