A Sunyaev-Zel'dovich map of the massive core in the luminous X-ray cluster RXJ1347-1145

Details A Sunyaev-Zel'dovich map of the massive core in the luminous X-ray cluster RXJ1347-1145 A Sunyaev-Zel'dovich map of the massive core in the luminous X-ray cluster RXJ1347-1145

1999-05-12

arxiv.org/abs/astro-ph/9905139v1

Astronomy and Astrophysics

Astrophysics

16 pages, 2 figures, accepted for publication in ApJ Letters

Scientific paper

We have mapped the Sunyaev-Zel'dovich decrement (hereafter SZ) in the direction of the most luminous X-ray cluster known to date, RXJ1347-1145, at z=0.451. This has been achieved with an angular resolution of about 23'' using the Diabolo photometer running on the IRAM 30 meter radio telescope. We present here a map of the cluster central region at 2.1mm. The Comptonization parameter towards the cluster center, $\yc=(12.7^{+2.9}_{-3.1})\times 10^{-4}$, corresponds to the deepest SZ decrement ever observed. Using the gas density distribution derived from X-ray data, this measurement implies a gas temperature $\te=16.2 \pm 3.8$ keV. The resulting total mass of the cluster is, under hydrostatic equilibrium, $M(r<1 Mpc)=(1.0 \pm 0.3) \times 10^{15} M_\odot$ for a corresponding gas fraction $f_{gas}(r<1 Mpc)=(19.5 \pm 5.8)%$.

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