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18 February 2025
 
  » arxiv » astro-ph/0112105

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The baryon fraction in X-Rays galaxy clusters revisited
R. Sadat ; A. Blanchard ; M. Douspis ;
Date 5 Dec 2001
Subject astro-ph
AffiliationOMP Toulouse), A. Blanchard (OMP Toulouse), M. Douspis (Oxford
AbstractOne of the most direct way to constrain the matter density of the universe $Omega_M$ is to measure the baryon content in X-Rays clusters of galaxies. Typical value of the mean gas mass fraction is $fg sim 0.15h^{-3/2}$ which leads to $omM <0.4$. In this talk I will discuss the issue of the gas fraction radial distribution inside a cluster and foccus on the apparent discrepancy between the theoretical shape predicted by numerical simulations and the observations. I will show that a significant part of this discrepancy is due to several systematics in both the gas mass and total mass determinations. Revising the gas as well as the binding masses removes such a discrepancy and results in a lower baryon mass fraction of $fb(r_{500}) sim 10 %$ (Sadat & Blanchard 2001). Finally, I will discuss the cosmological constraints we obtain when we combine the revised baryon fraction with primordial fluctuations.
Source arXiv, astro-ph/0112105
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