Extended SZ map of the most luminous X-ray cluster, RXJ1347-1145

Abstract

We present in this letter a high resolution (22'' FWHM) extended map at 2.1mm of the Sunyaev-Zel'dovich effect toward the most luminous X-ray cluster, RXJ1347-1145. These observations have been performed with the DIABOLO photometer working at the focus of the 30m IRAM radiotelescope. We have derived a projected gas mass of $(1.1\pm 0.1)\times 10^{14}{h}_{50}^{-5/2}$M${}_{\odot }$ within an angular radius of $\theta =74^{\prime \prime }$ (ie: projected radius of 0.6Mpc, $H_0=50$km/s/Mpc, ${\Omega }_m=0.3$, ${\Omega }_{\Lambda }=0.7$). 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 2.1mm flux of a well known radio source lying in the center of the cluster: $F_{RS}(2.1\text{mm})=5.7\pm 1.6$mJy.

14 pages, 7 figures, accepted for publication in ApJ

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