The cluster gas mass fraction as a cosmological probe: a revised study

Understand

(Abriged) We present the analysis of the baryonic content of 52 X-ray luminous galaxy clusters observed with Chandra in the redshift range 0.3-1.273.

• We use the deprojected X-ray surface brightness profiles and the measured values of the gas temperature to recover the gas and total mass profiles.
• By assuming that galaxy clusters are representative of the cosmic baryon budget, the distribution of the cluster baryon fraction in the hottest (T> 4 keV) systems as a function of redshift is used to constrain the cosmological parameters.
• We discuss how our constraints are affected by several systematics, namely the isothermality, the assumed baryon fraction in stars, the depletion parameter and the sample selection.