Precision Cosmology from X-ray AGN clustering

Abstract

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 ${\sigma }_8$, we find stringent simultaneous constraints in the (${\Omega }_m,$w) plane, with ${\Omega }_m=0.26\pm 0.05$, w$=-0.93_{-0.19}^{+0.11}$.

Comments: Accepted for publication, MNRAS Lett. in press, 5 pages, 2 figures