On cosmological constraints from statistics of X-ray clusters

Details On cosmological constraints from statistics of X-ray clusters On cosmological constraints from statistics of X-ray clusters

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...415...42h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 415, no. 1, p. 42-49.

Astronomy and Astrophysics

Astronomy

13

Galactic Clusters, Galactic Evolution, Space Density, Statistical Analysis, X Ray Astronomy, Astronomical Models, Cosmology, Density Distribution

Scientific paper

We studied the temperature and luminosity functions of X-ray clusters and obtained cosmological constraints from the statistics and the evolution of X-ray clusters for various cosmological models. The statistical analysis for the temperature function and the luminosity function for X-ray clusters, according to the hierarchical clustering scenario (the CDM model, for example) suggests that the density parameter Omega-0 is about 1.0 and the baryon fraction f(b) is about 0.15 with h = 0.5 or f(b) about 0.05 with h = 1.0. The analysis for the temperature function shows also that the bias parameter b is about 1.5 and that the index for the power spectrum n is about -1.5, with the suggestion that secondary effects occur like that of the substructure or larger variance of the density perturbation in a large scale not less than 8/h Mpc. The constraint of baryon density Omega-b between values 0.05 and 0.15 from our analysis conflicts with Omega-b h-squared between values of 0.01 and 0.02 from primordial nucleosynthesis. ROSAT and ASCA will provide new information for solving the cosmological problems studied in this paper.

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