Cosmology from XMM High-Z AGN Clustering

Details Cosmology from XMM High-Z AGN Clustering Cosmology from XMM High-Z AGN Clustering

2007-01-24

arxiv.org/abs/astro-ph/0701696v1

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of the 6th International Workshop on the Identification of Dark Matter, held in Rhodes, Greece

Scientific paper

We review the high-redshift X-ray selected AGN clustering, based on the XMM/2dF survey, and compare it with other recent XMM-based results. Using the recent Hasinger et al. (2005) and La Franca et al. (2005) luminosity functions we find that the spatial clustering lengths, derived using Limber's inversion equation, are $\sim 17$ and 20 $h^{-1}$ Mpc for the soft and hard band sources while their median redshifts are ${\bar z}\sim 1.2$ and 0.8, respectively. The corresponding bias factors at $z=\bar{z}$ are $\sim 5.3\pm 0.9$ and $\sim 5.1\pm1.1$, respectively. Within the framework of a flat cosmological model we find that our results support a model with $\Omega_m \simeq 0.26$, $\sigma_8\simeq 0.75$, $h\simeq 0.72$, w$\simeq -0.9$ (in excellent agreement with the 3 year WMAP results). We also find the present day bias of X-ray AGNs to be $b_{\circ}\sim 2$.

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