We have assembled a sample of 115 galaxy clusters at 0.10.5. We measured the mean metal abundance of the cluster gas as a function of redshift and found significant evolution, with the abundances dropping by 50% between z=0.1 and z~1. This evolution was still present (although less significant) when the cluster cores were excluded from the abundance measurements, indicating that the evolution is not solely due to the disappearance of relaxed, cool core clusters (which are known to have enhanced core metal abundances) from the population at z>~0.5.

Cone search capability for table J/ApJS/174/117/clusters (Properties of the clusters)

Cone search capability for table J/ApJS/174/117/table1 (Summary of the observations used)