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We present the analysis of a Suzaku observation of the Ophiuchus galaxycluster. We confirmed that the cluster has a cool core. While the temperatureof the intracluster medium (ICM) decreases toward the center, the metalabundance increases. Except for the core (r<~50 kpc), the cluster is hot (~9-10keV) and is almost isothermal for r<~1 Mpc; the latter contradicts a previousstudy. We do not detect the variation of the redshift of the ICM in thecluster; the upper limit of the velocity difference is 3000 km s^-1. The ironline ratios in X-ray spectra indicate that the ICM has reached the ionizationequilibrium state. From these results, we conclude that the Ophiuchus clusteris not a major merger cluster but one of the hottest clusters with a cool core.We obtain the upper limit of non-thermal emission from the cluster, which isconsistent with both the recent claimed detection with INTEGRAL and the recentupper limits with the Swift/BAT. If the cluster has bright non-thermal emissionas suggested by the INTEGRAL measurement, it is probably not due to a recentmajor cluster merger.

Suzaku Observation of the Ophiuchus Galaxy Cluster: One of the Hottest Cool Core Clusters