Evolution of the cluster X-ray scaling relations since z>0.4

We derive correlations between X-ray temperature, luminosity, and gas mass for a sample of 22 distant, z>0.4, galaxy clusters observed with Chandra. We detect evolution in all three correlations between z>0.4 and the present epoch. In particular, in the Omega=0.3, Lambda=0.7 cosmology, the luminosity corresponding to a fixed temperature scales approximately as (1+z)(1.5±0.3); the gas mass for a fixed luminosity scales as (1+z)(-1.8±0.4); and the gas mass for a fixed temperature scales as (1+z)**(-0.5±0.4) (all uncertainties are 90% confidence). We briefly discuss the implication of these results for cluster evolution models.