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We present the analysis of Suzaku observations of the young open clusterWesterlund 2, which is filled with diffuse X-ray emission. We found that theemission consists of three thermal components or two thermal and onenon-thermal components. The upper limit of the energy flux of the non-thermalcomponent is smaller than that in the TeV band observed with H.E.S.S. This mayindicate that active particle acceleration has stopped in this cluster, andthat the accelerated electrons have already cooled. The gamma-ray emissionobserved with H.E.S.S. is likely to come from high-energy protons, which hardlycool in contrast with electrons. Metal abundances of the diffuse X-ray gas mayindicate the explosion of a massive star in the past.

Suzaku Observation of the Diffuse X-Ray Emission from the Open Cluster Westerlund 2: a Hypernova Remnant?