Predicting the Clustering Properties of X-ray Galaxy Clusters

We present a theoretical model wich aims at predicting the custering properties of X-ray clusters in flux-limited surveys for different comological scenarios. The model uses the theoretical and empirical relations between mass, temperature and X-ray cluster luminosity, and fully accounts for the redshift evolution of the underlying dark matter clustering and cluster bias factor. We apply the model to the RASS1 Bright Sample. The results show that the Einstein-de Sitter models display too low correlation length, while models with a matter density parameter Omega_om=0.3 (with or without a comological constant) are successfull in reproducing the observed clustering.