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The current generation of X-ray observatories like Chandra allows studieswith very fine spatial details. It is now possible to resolve X-ray pointsources projected into the cluster diffuse emission and exclude them from theanalysis to estimate the ``correct'' X-ray observables. In order to verify theincidence of point sources on the cluster thermal emission and to evaluate theimpact of their non-thermal emission on the determination of clusterproperties, we used a sample of 18 high-z (0.25 < z < 1.01) clusters from theChandra archive. We performed a detailed analysis of the cluster properties andcompared the changes observed in the X-ray observables, like temperature andluminosity or their inter-relation, when one keeps the point sources in theanalysis. The point sources projected into the cluster extended emission affectthe estimates of cluster temperature or luminosity considerably (up to 13% and17% respectively). These percentages become even larger for clusters with z >0.7 where temperature and luminosity increase up to 24% and 22%, respectively.Thus the point sources should be removed to correctly estimate the clusterproperties. However the inclusion of the point sources does not impactsignificantly the slope and normalization of the L-T relationship since foreach cluster the correction to be applied to T and L produces a moderate shiftin the L-T plane almost parallel to the best-fit of the ``correct'' L-Trelation.

High redshift X-ray galaxy clusters. I. The impact of point sources on the cluster properties