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Astron. Astrophys. 317, 646-655 (1997)

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ROSAT/HRI and ASCA observations of the most luminous X-ray cluster RX J1347.5-1145

S. Schindler * 1, 2, M. Hattori 1, 3, D.M. Neumann 1 and H. Böhringer 1

1 Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, D-85478 Garching, Germany
2 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Straße 1, D-85478 Garching, Germany
3 Astronomical Institute, Tôhoku University, Aoba Aramaki, Sendai 980, Japan

Received 11 March 1996 / Accepted 13 June 1996


We report on the X-ray properties of the exceptional X-ray cluster RX J1347.5-1145 at z =0.451. We confirm that it is with a luminosity [FORMULA] erg/s the most luminous X-ray cluster discovered to date. The mass of the cluster within 1.7 Mpc is [FORMULA]. A comparison of the central X-ray mass and the mass determined from a simple gravitational lens model shows a discrepancy of a factor of 2-3 with the X-ray mass being smaller. The temperature of the cluster is [FORMULA]  keV. We detect a strong FeK line corresponding to a metallicity of [FORMULA] in solar units, which is an unexpectedly high value for a distant and hot cluster. There are several hints that the cluster contains an extremely strong cooling flow. With the usual assumptions we derive formally a mass accretion rate of more than 3000 [FORMULA] /yr indicating that this may be the largest cooling flow detected so far. To find these extreme properties in this distant cluster which can be taken as an indication of a well relaxed and old system is of high importance for the theory of formation and evolution of clusters.

Key words: galaxies: clusters: individual: RX J1347.5-1145 – inter galactic medium – dark matter – X-rays: galaxies – cooling flows – cosmology: observations

* e-mail: sas@mpa-garching.mpg.de

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© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998