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X-ray observations of galaxy clusters at high redshift (z>0.5) indicate thatthey are more morphologically complex and less virialized than those atlow-redshift. We present the first subarcmin resolution at 18 GHz observationsof the Sunyaev-Zel'dovich (SZ) effect for ClJ0152-1357 using the AustraliaTelescope Compact Array. ClJ0152-1357 is a massive cluster at redshift z=0.83and has a complex structure including several merging subclumps which have beenstudied at optical, X-ray, and radio wavelengths. Our high-resolutionobservations indicate a clear displacement of the maximum SZ effect from thepeak of X-ray emission for the most massive sub-clump. This result shows thatthe cluster gas within the cluster substructures is not virialised inClJ0152-1357 and we suggest that it is still recovering from a recent mergerevent. A similar offset of the SZ effect has been recently seen in the `bulletcluster' by Malu et al. This non-equilibrium situation implies that highresolution observations are necessary to investigate galaxy cluster evolution,and to extract cosmological constraints from a comparison of the SZ effect andX-ray signals.

High angular resolution observation of the Sunyaev-Zel'dovich effect in the massive z=0.83 cluster ClJ0152-1357