XMM-Newton observation of the most X-ray-luminous galaxy cluster RX J1347.5-1145

Free access article

Issue		A&A Volume 427, Number 1, November III 2004


Page(s)		L9 - L12
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:200400086

A&A 427, L9-L12 (2004)
DOI: 10.1051/0004-6361:200400086

Letter

XMM-Newton observation of the most X-ray-luminous galaxy cluster RX J1347.5-1145

M. Gitti and S. Schindler

Institut für Astrophysik, Leopold-Franzens Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
e-mail: myriam.gitti@uibk.ac.at

(Received 16 July 2004 / Accepted 25 September 2004 )

Abstract
We report on an XMM-Newton observation of RX J1347.5-1145 ( z=0.451), the most luminous X-ray cluster of galaxies currently known, with a luminosity $L_{\rm X} = 6.0 \pm 0.1 \times 10^{45}$ erg/s in the [2-10] keV energy band. We present the first temperature map of this cluster, which shows a complex structure. It identifies the cool core and a hot region at radii 50-200 kpc to south-east of the main X-ray peak, at a position consistent with the subclump seen in the X-ray image. This structure is probably an indication of a submerger event. Excluding the data of the south-east quadrant, the cluster appears relatively relaxed and we estimate a total mass within 1.7 Mpc of $2.0\pm 0.4 \times 10^{15}~M_{\odot}$ . We find that the overall temperature of the cluster is $kT = 10.0 \pm 0.3$ keV. The temperature profile shows a decline in the outer regions and a drop in the centre, indicating the presence of a cooling core which can be modelled by a cooling flow model with a minimum temperature ~2 keV and a very high mass accretion rate, $\dot{M} \sim 1900~M_{\odot}$ yr. We compare our results with previous observations from ROSAT, ASCA and Chandra.

Key words: galaxies: clusters: particular: RX J1347.5-1145 -- X-ray: galaxies: clusters -- cooling flows

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