Substructures revealed by the Sunyaev-Zel'dovich effect at 150 GHz in a high-resolution map of RX J1347-1145

We report on mapping observations toward the region of the most luminous X-ray cluster, RX J1347-1145 (z = 0.45), through the Sunyaev-Zel'dovich effect at 21 GHz and 150 GHz with the Nobeyama 45-m telescope. While a low angular resolution image at 21 GHz (beam-size sigma (FWHM) of 76 ) shows a consistent feature with the ROSAT/HRI X-ray image, a higher angular resolution image (sigma (FWHM) = 13 ) at 150 GHz reveals complex morphological structures of the cluster region, which cannot be simply described by the spherical isothermal beta -model. If such inhomogeneous morphological features prove to be generic for high-redshift clusters, distance measurements to the clusters based on their Sunyaev-Zel'dovich data with low angular resolution imaging should be interpreted with caution.