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| Paper: |
Gas Mass Fraction from XMM-Newton and Chandra High Redshift Clusters and Its Use as a Cosmological Test |
| Volume: |
371, Statistical Challenges in Modern Astronomy IV |
| Page: |
415 |
| Authors: |
Ferramacho, L.; Blanchard, A. |
| Abstract: |
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 Ωm 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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