A reanalysis of the X-ray luminosities of clusters of galaxies with 0.3<z<0.6 in the EMSS sample

Abstract

The X-ray luminosities of the Einstein Extended Medium Sensitivity Survey (EMSS) clusters of galaxies with redshifts 0.3 250kpc (the constant value assumed in the EMSS), the new luminosities are 2.2 ′ 0.15 times the previous measurements. The X-ray luminosity function (XLF) at 0.3 < z < 0.6 is recalculated and is found to be consistent with the local XLF. The constraints on the updated properties of the 0.3 < z < 0.6 EMSS sample, including a comparison with the number of clusters predicted from local XLFs, indicate that the space density of luminous, massive clusters either has not evolved or has increased by a small factor 2 since z = 0.4. The implications of this result are discussed in terms of constraints on the cosmological parameter Ω 0 .