Precision Cosmology from X-ray AGN clustering

We place tight constraints on the main cosmological parameters of spatially flat cosmological models by using the recent angular clustering results of XMM-{\it Newton} soft (0.5-2 keV) X-ray sources (Ebrero et al. 2009a), which have a redshift distribution with a median of $z\sim 1$. Performing a standard likelihood procedure, assuming a constant in comoving coordinates AGN clustering evolution, the AGN bias evolution model of Basilakos et al. (2008) and the WMAP5 value of $σ_8$, we find stringent simultaneous constraints in the ($Ω_{m},$w) plane, with $Ω_{m}= 0.26\pm 0.05$, w$=-0.93^{+0.11}_{-0.19}$.

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