Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..581f&link_type=abstract
International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 581 - 582
Astronomy and Astrophysics
Astrophysics
Clusters Of Galaxies, Clusters Of Galaxies: X Rays
Scientific paper
The combination of optical and X-ray data provides a key to the fundamental properties of clusters of galaxies. For their analysis, the authors choose a complete sample of nearby clusters in the redshift range from 0.02 to 0.05. Using the COSMOS- and ROSAT-data they derive robust optical and X-ray parameters from surface brightness profiles. In particular, they use the optical and X-ray luminosity and the half-light radii in both energy bands for the analysis. They derive several monovariant relations for different morphological classes of galaxy clusters. Under the assumption that the cluster is virialized and in hydrostatic equilibrium they estimate the mass to light ratio and the dark matter fraction. The remarkably low scatter in this relation reveals the existence of a fundamental plane of clusters of galaxies in the optical and X-ray parameter space. In addition, the comparison with structures on smaller scales supports the hierarchical clustering scenario.
Böhringer Hans
Fritsch Christoph
Voges Wolfgang
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