1999ApJ...519L.115P

We have mapped the Sunyaev-Zeldovich (SZ) decrement in the direction of the most luminous X-ray cluster known to date, RX J1347-1145, at z=0.451. This has been achieved with an angular resolution of about 23" using the Diabolo photometer running on the IRAM 30 m radio telescope. We present here a map of the cluster central region at 2.1 mm. The Comptonization parameter toward the cluster center, y_c=(12.7^+2.9_–3.1)x10^–4, corresponds to the deepest SZ decrement ever observed. Using the gas density distribution derived from X-ray data, this measurement implies a gas temperature of T_e=16.2±3.8 keV. The resulting total mass of the cluster is, under hydrostatic equilibrium, M(r<1 Mpc)=(1.0±0.3)x10¹⁵ M_☉ for a corresponding gas fraction f_gas(r<1 Mpc)=19.5%±5.8%.