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We report on mapping observations toward the region of the most luminousX-ray cluster RXJ1347-1145 (z=0.45) through the Sunyaev-Zel'dovich effect at21GHz and 150GHz with the Nobeyama 45-m telescope. While a low angularresolution image at 21GHz (beam-size of 76'') shows a consistent feature withthe ROSAT/HRI X-ray image, a higher angular resolution image (13'') at 150GHzreveals complex morphological structures of the cluster region, which cannot besimply described by the spherical isothermal beta-model. If such inhomogeneousmorphological features prove to be generic for high redshift clusters, distancemeasurements to the clusters based on their Sunyaev-Zel'dovich data with lowangular resolution imaging should be interpreted with caution.

Substructures Revealed by the Sunyaev–Zel’dovich Effect at 150 GHz in a High-Resolution Map of RX J1347$-$1145