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Issue A&A
Volume 376, Number 3, September IV 2001
Page(s) L27 - L30
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20010990



A&A 376, L27-L30 (2001)
DOI: 10.1051/0004-6361:20010990

Discovery of depressions in the X-ray emission of the distant galaxy cluster RBS797 in a CHANDRA observation

S. Schindler1, A. Castillo-Morales1, E. De Filippis1, A. Schwope2 and J. Wambsganss3

1  Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Birkenhead CH41 1LD, UK
2  Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
3  Universität Potsdam, Institut für Physik, Am Neuen Palais 10, 14469 Potsdam, Germany

(Received 14 May 2001 / Accepted 9 July 2001)

Abstract
We present CHANDRA observations of the X-ray luminous, distant galaxy cluster RBS797 at z=0.35. In the central region the X-ray emission shows two pronounced X-ray minima, which are located opposite to each other with respect to the cluster centre. These depressions suggest an interaction between the central radio galaxy and the intra-cluster medium, which would be the first detection in such a distant cluster. The minima are symmetric relative to the cluster centre and very deep compared to similar features found in a few other nearby clusters. A spectral and morphological analysis of the overall cluster emission shows that RBS797 is a hot cluster ( T=7.7+1.2-1.0 keV) with a total mass of $M_{\rm tot}(r_{500})=6.5^{+1.6}_{-1.2} \times 10^{14}{{M}_{\odot}}$.


Key words: galaxies: clusters: general -- intergalactic medium -- cosmology: observations -- cosmology: theory -- dark matter -- X-rays: galaxies

Offprint request: S. Schindler, sas@astro.livjm.ac.uk

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© ESO 2001


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