Spyros Basilakos, Manolis Plionis
Monthly Notices of the Royal Astronomical Society: Letters, Volume 400, Issue 1, November 2009, Pages L57–L60
Publication year: 2009

Summary 

We place tight constraints on the main cosmological parameters of spatially flat cosmological models by using the recent angular clustering results of XMMNewton soft (0.5–2 keV) X-ray sources, which have a redshift distribution with a median of z∼ 1. Performing a standard likelihood procedure, assuming a constant in comoving coordinates active galactic nuclei (AGN) clustering evolution, the AGN bias evolution model of Basilakos, Plionis & Ragone-Figueroa and the Wilkinson Microwave Anisotropy Probe5 value of σ8, we find stringent simultaneous constraints in the (Ωmw) plane, with Ωm= 0.26 ± 0.05, w=−0.93+0.11−0.19.