Precision Cosmology from X-ray AGN clustering

TL;DR

This study uses X-ray AGN clustering data to tightly constrain key cosmological parameters, including matter density and dark energy equation of state, in flat cosmological models.

Contribution

It provides new constraints on cosmological parameters by analyzing X-ray AGN clustering with a specific bias evolution model and WMAP5 data.

Findings

Constraints on mbda_m = 0.26 b1 0.05

Dark energy equation of state w = -0.93^{+0.11}_{-0.19}

Supports flat cosmological models with specific parameter values.

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$=-0.93^{+0.11}_{-0.19}$.