Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-08-13
Astron.Astrophys. 398 (2003) 867-878
Astronomy and Astrophysics
Astrophysics
10 pages, 7 figures, accepted for publication in Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20021715
For the first time the large-scale clustering and the mean abundance of galaxy clusters are analysed simultaneously to get precise constraints on the normalized cosmic matter density $\Omega_m$ and the linear theory RMS fluctuations in mass $\sigma_8$. A self-consistent likelihood analysis is described which combines, in a natural and optimal manner, a battery of sensitive cosmological tests where observational data are represented by the (Karhunen-Lo\'{e}ve) eigenvectors of the sample correlation matrix. This method breaks the degeneracy between $\Omega_m$ and $\sigma_8$. The cosmological tests are performed with the ROSAT ESO Flux-Limited X-ray (REFLEX) cluster sample. The computations assume cosmologically flat geometries and a non-evolving cluster population mainly over the redshift range $0
Böhringer Hans
Collins Chris A.
Guzzo Luigi
Schuecker Peter
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