Evolution of the Cluster X-Ray Scaling Relations since [CLC][ITAL]z[/ITAL][/CLC] ] 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 Ω = 0.3, Λ = 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.