1999/05/12 by É. Pointecouteau, E. Pointecouteau, M. Giard +17
Physics and Astronomy · #Astrophysics (astro-ph) #Astrophysics and Cosmic Phenomena #Astrophysics and Star Formation Studies #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9905139
16 pages, 2 figures, accepted for publication in ApJ Letters
arxiv created 1999/05/12 · openalex publication_date 1999/05/12 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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<1 Mpc)=(1.0 ± 0.3) × 1015 M_\odot for a corresponding gas fraction fgas(r<1 Mpc)=(19.5 ± 5.8)%.