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We investigate a non-equilibrium ionization state and an electron-iontwo-temperature structure of the intracluster medium in the merging galaxycluster, 1E0657-56 (the Bullet cluster), using a series of N-body andhydrodynamic simulations. We find that the electron temperature at the shocklayer associated with the X-ray sub peak (bullet) is quite different dependingon the thermal relaxation model between electrons and ions; ~25 keV for theCoulomb thermal relaxation model and ~45 keV for the instantaneous thermalrelaxation model in the simulations which reproduce the observed X-raymorphology. Furthermore, both of Fe xxv and Fe xxvi are overabundant comparedwith the ionization equilibrium state around the shock layer, and thus, theintensity ratio between Fe xxv and Fe xxvi K alpha lines are significantlyaltered from that in the ionization equilibrium state. We also carry out thesimulations with various sets of merger parameters, and discuss a possiblerange of the non-equilibrium effects in this system. Our results could betested with future X-ray observations such as Astro-H with better sensitivityin high energy band.

Non-Equilibrium Ionization State and Two-Temperature Structure in the Bullet Cluster 1E0657-56