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Galaxy and hot gas distributions in the z=0.52 galaxy cluster RBS380 from CHANDRA and NTT observations

  • We present CHANDRA X-ray and NTT optical observations of the distant z=0.52 galaxy cluster RBS380 -- the most distant cluster of the ROSAT Bright Source (RBS) catalogue. We find diffuse, non-spherically symmetric X-ray emission with a X-ray luminosity of L_X(0.3-10 keV)=1.6 10^(44) erg/s, which is lower than expected from the RBS. The reason is a bright AGN in the centre of the cluster contributing considerably to the X-ray flux. This AGN could not be resolved with ROSAT. In optical wavelength we identify several galaxies belonging to the cluster. The galaxy density is at least 2 times higher than expected for such a X-ray faint cluster, which is another confirmation of the weak correlation between X-ray luminosity and optical richness. The example of the source confusion in this cluster shows how important high- resolution X-ray imaging is for cosmological research.

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Author:Rodrigo Gil-Merino, Sabine Schindler
Document Type:Article
Year of first Publication:2003
Year of Completion:2003
Release Date:2017/03/24
Source:Highlights of Spanish astrophysics III : proceedings of the 54th Scientific Meeting of the Spanish Astronomical Society (SEA) / Hrsg.: Jaime Zamorano; Javier Gorgas; Jesus Gallego. - Dodrecht : Kluwer Academic Publ., 2003. - S. 6
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Institution name at the time of publication:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik