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

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(-1.0)(+1.2) keV) with a total mass of M-tot(r(500)) = 6.5(-1.2)(+1.6) x 10(14) M-..

[1]  C. Reynolds,et al.  Shocks and Sonic Booms in the Intracluster Medium: X-Ray Shells and Radio Galaxy Activity , 2000 .

[2]  E. Greisen,et al.  The NRAO VLA Sky Survey , 1996 .

[3]  J. Dickey,et al.  H I in the Galaxy , 1990 .

[4]  Scott L. Forseth.  Solid Polyomino Constructions , 1976 .

[5]  Gus Evrard,et al.  Properties of the Intracluster Medium in an Ensemble of Nearby Galaxy Clusters , 1999, astro-ph/9901281.

[6]  ROSAT PSPC observations of 36 high‐luminosity clusters of galaxies: constraints on the gas fraction , 1999, astro-ph/9901304.

[7]  A. Schwope,et al.  The ROSAT Bright Survey: I. Identification of an AGN sample with hard ROSAT X-ray spectra † , 1998, astro-ph/9811139.

[8]  Duane A. Liedahl,et al.  New Calculations of Fe L-Shell X-Ray Spectra in High-Temperature Plasmas , 1995 .

[9]  S. Schindler.  Interaction in the bimodal galaxy cluster A3528 , 1995, astro-ph/9512040.

[10]  V. Schindler.  Group effectiveness in improving social interaction skills. , 1999 .

[11]  Wolfgang Voges,et al.  The ROSAT Bright Survey: II. Catalogue of all high-galactic latitude RASS sources with PSPC countrate CR > 0.2 s -1 , 2000 .

[12]  Lee.  The Astronomische Nachrichten , 1858 .

[13]  S. Ettori,et al.  Chandra imaging of the complex X-ray core of the Perseus cluster , 2000, astro-ph/0007456.

[14]  C. Reynolds,et al.  X-Ray Signatures of Evolving Radio Galaxies , 1998, astro-ph/9801268.

[15]  M. Drinkwater,et al.  Constructing the Universe with Clusters of Galaxies , 2000 .

[16]  C. Sarazin,et al.  A High-Resolution ROSAT X-Ray Study of Abell 4059 , 1997, astro-ph/9710213.