We review the high-redshift X-ray selected AGN clustering, based on theXMM/2dF survey, and compare it with other recent XMM-based results. Us-ing the recent Hasinger et al. (2005) and La Franca et al. (2005) luminosityfunctions we find that the spatial clustering lengths, derived using Limber's in-version equation, are 17 and 20 Mpc for the soft and hard band sourceswhile their median redshifts are z 1.2 and 0.8, respectively. The correspond- ing bias factors at z = z are~5.3 ± 0.9 and~5.1 1.1, respectively. Withinthe framework of a flat cosmological model we find that our results support a model with Ω_m= 0.26, σ8=0.75,h =0.72,—0.9 (in excellent agreementwith the 3 year WMAP results). We also find the present day bias of X-rayAGNs to be bo ~ 2.
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