A Sunyaev-Zel’dovich map of the massive core in the luminous X-ray cluster RXJ1347-1145
نویسنده
چکیده
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) × 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 ± 3.8 keV. The resulting total mass of the cluster is, under hydrostatic equilibrium, M(r < 1Mpc) = (1.0 ± 0.3) × 10 M for a corresponding gas fraction fgas(r < 1Mpc) = (19.5± 5.8)%. Subject headings: cosmology: cosmic microwave background — cosmology: observations — galaxies: clusters: individual (RXJ1347-1145) — intergalactic medium
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