A test of the evolution of gas depletion factor in galaxy clusters using strong gravitational lensing systems

In this work, we discuss a new method to probe the redshift evolution of the gas depletion factor, i.e. the ratio by which the gas mass fraction of galaxy clusters is depleted with respect to the universal mean of baryon fraction. The dataset we use for this purpose consists of 40 gas mass fraction measurements measured at r(2500) using Chandra X-ray observations, strong gravitational lensing sub-samples obtained from SLOAN Lens ACS + BOSS Emission-line Lens Survey (BELLS) + Strong Legacy Survey SL2S + SLACS. For our analysis, the validity of the cosmic distance duality relation is assumed. We find a mildly decreasing trend for the gas depletion factor as a function of redshift at about 2.7 sigma.

Automated summary

In this work, we discuss a new method to probe the redshift evolution of the gas depletion factor and find a mildly decreasing trend as a function of redshift at about 2.7 sigma.