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We present the results from the analysis of long Suzaku observations of themost X-ray luminous galaxy cluster RX J1347.5-1145 at z=0.451. Aims: We studyphysical properties of the hot (~20 keV) gas clump in the south-east (SE)region discovered by the Sunyaev-Zel'dovich (SZ) effect observations, tounderstand the gas physics of a violent cluster merger. We also explore asignature of non-thermal emission using the hard X-ray data. Results: We findthat the single-temperature model fails to reproduce the continuum emission andFe-K lines measured by XIS simultaneously. The two-temperature model with avery hot component improves the fit, although the XIS data can only give alower bound on its temperature. We detect the hard X-ray emission in the 12-40keV band at the 7 sigma level; however, the significance becomes marginal whenthe systematic error in the background estimation is included. With the Suzaku+ Chandra joint analysis, we determine the temperature of the SE excesscomponent to be 25.3^{+6.1}_{-4.5} ^{+6.9}_{-9.5} keV (90% statistical andsystematic errors), which is in an excellent agreement with the previous SZ +X-ray analysis. This is the first time that the X-ray spectroscopy alone givesa good measurement of the temperature of the hot component in the SE region,which is made possible by Suzaku's unprecedented sensitivity to the wide X-rayband. These results strongly indicate that the cluster has undergone a recent,violent merger. The spectral analysis shows that the SE component is consistentwith being thermal. We find the 3 sigma upper limit on the non-thermal flux, F< 8e-12 erg s^{-1} cm^{-2} in the 12-60 keV band. Combining this limit with arecent discovery of the radio mini halo at 1.4 GHz, we find a lower limit onthe strength of the intracluster magnetic field, B > 0.007 micro G.

Suzaku broad-band spectroscopy of RX J1347.5-1145: constraints on the extremely hot gas and non-thermal emission