Extended Sunyaev-Zeldovich Map of the Most Luminous X-Ray Cluster, RX J1347–1145

We present a high-resolution (22'' FWHM) extended map at 2.1 mm of the Sunyaev-Zeldovich effect toward the most luminous X-ray cluster, RX J1347-1145. These observations have been performed with the Diabolo photometer working at the focus of the 30 m IRAM radiotelescope. We have derived a projected gas mass of (1.1 ± 0.1) × 1014 h M☉ within an angular radius of θ = 74'' (i.e., projected radius of 0.6 Mpc, H0 = 50 km s-1 Mpc-1, Ωm = 0.3, ΩΛ = 0.7). This result matches very well the expected gas mass from the cluster models of X-ray data. With an unprecedented sensitivity level, our measurement does not show significant departure from a spherical distribution. The data analysis also allows us to characterize the 2.1 mm flux of a well-known radio source lying in the center of the cluster, FRS(2.1 mm) = 5.7 ± 1.6 mJy.