Gas Mass Fraction from XMM-Newton and Chandra High Redshift Clusters and Its Use as a Cosmological Test

Details Gas Mass Fraction from XMM-Newton and Chandra High Redshift Clusters and Its Use as a Cosmological Test Gas Mass Fraction from XMM-Newton and Chandra High Redshift Clusters and Its Use as a Cosmological Test

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..371..415f&link_type=abstract

Statistical Challenges in Modern Astronomy IV ASP Conference Series, Vol. 371, proceedings of the conference held 12-15 June 200

Astronomy and Astrophysics

Astronomy

Scientific paper

Using a sample of distant clusters observed by XMM-Newton and Chandra, and comparing their gas fraction at different radii to the one observed for nearby clusters, we have determined likelihood functions for Ω_m in a flat universe. The analysis allows to conclude that this test provides ambiguous results, which are due to the complex structure of the ICM that induce a dependence of the gas fraction with temperature, radius and redshift, not expected in pure gravitational models. The use of gas fraction in X-ray clusters to constrain cosmological parameters seems therefore to be compromised.

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