1999ApJ...516L...1K

We report on the detection of the Sunyaev-Zeldovich (SZ) signals toward the most luminous X-ray cluster RX J1347-1145 at the Nobeyama Radio Observatory (21 and 43 GHz) and with the James Clerk Maxwell Telescope (350 GHz). In particular, the latter is the first successful detection of the SZ temperature increment in the submillimeter band that resolved the profile of a cluster of galaxies. Both the observed spectral dependence and the radial profile of the SZ signals are fully consistent with those expected from the X-ray observation of the cluster. The combined analysis of the 21 and 350 GHz data reproduces the temperature and core radius of the cluster that are determined with ROSAT and ASCA when we adopt the slope of the density profile from the X-ray observations. Therefore, our present data provide the strongest and most convincing case for the detection of the submillimeter SZ signal from the cluster as well as in the Rayleigh-Jeans regime. We also discuss briefly the cosmological implications of the present results.