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Astron. Astrophys. 322, 66-72 (1997)


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ROSAT/HRI study of the optically rich, lensing cluster Cl 0500-24

Sabine Schindler 1, 2 and Joachim Wambsganss 3

1 MPI für extraterrestrische Physik, Giessenbachstr., D-85748 Garching, Germany (sas@mpa-garching.mpg.de)
2 MPI für Astrophysik, Karl-Schwarzschild-Str. 1, D-85748 Garching, Germany
3 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany (jwambsganss@aip.de)

Received 15 July 1996 / Accepted 16 November 1996

Abstract

An analysis of a ROSAT/HRI observation of the optically rich, gravitationally lensing galaxy cluster Cl 0500-24 (or Abell S0506) is presented. The X-ray luminosity and the morphology of the extended X-ray emission support the view that Cl 0500-24 consists of two subclusters at a velocity difference of [FORMULA] km/s that happen to lie along the line of sight and are probably physically unrelated. The X-ray emission is mainly correlated with one of the subclusters - the northern subconcentration at redshift [FORMULA]. We show that the X-ray luminosity of this supposedly rich cluster is relatively low at [FORMULA] erg/s in the ROSAT band ([FORMULA] erg/s bolometric) indicating that there is no tight correlation between X-ray luminosity and optical richness. The derived total mass of the cluster of [FORMULA] [FORMULA] (within 1 Mpc of the X-ray maximum) is very low even when assigning it only to one subcluster. The gas mass within the same radius is [FORMULA] [FORMULA], corresponding to a high gas mass fraction of [FORMULA] %.

Key words: galaxies: clusters: individual: Cl 0500-24 – galaxies: clusters: individual: A S0506 – intergalactic medium – dark matter – X-rays: galaxies

Send offprint requests to: Sabine Schindler

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998

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