  Here we discuss the X-ray properties of clusters of galaxies optically
selected in the Red-Sequence Cluster Survey (RCS) observed with the Chandra
satellite, at redshifts 0.6 < z < 1.2. We intended to assess the evolutionary
stage of optically selected high-z clusters of galaxies, performing a spectral
analysis of the diffuse emission from their ICM. We also investigated the
distribution of AGN in their surroundings. The background subtracted spectra
were analyzed and fitted with a single temperature model to measure average ICM
temperature, X-ray bolometric luminosity and Fe abundance within typical radii
between 200 and 350 kpc. We also analyzed the point source number density and
spatial distribution in the RCS clusters fields as a function of the X-ray
flux. We detected emission for the majority of the clusters, except for three,
for which we have only marginal detection at ~3 Sigma. We find that the
normalization of the L-T relation for RCS clusters is a factor of ~2 lower than
the one for X-ray selected clusters. We confirm that the Fe abundance in the
detected objects is consistent with that of X-ray selected clusters at the same
redshift. We also found an excess of low-luminosity AGN towards the center of
the clusters.
