| Abstract
| - Abstract. We attempt to put constraints on different cosmological and biasing models by combining the recent clustering results of X-ray sources in the local (z≤0.1) and distant Universe (z∼1). To this end we compare the measured angular correlation function for bright (Akylas et al.) and faint (Vikhlinin & Forman) ROSAT X-ray sources respectively with those expected in three spatially flat cosmological models. Taking into account the different functional forms of the bias evolution, we find that there are two cosmological models which match the data well. In particular, low-Ω○ cosmological models (ΩΛ=1−Ω○=0.7) that contain either (i) high σ8mass=1.13 value with galaxy merging bias, b(z)∝(1+z)1.8 or (ii) low σ8mass=0.9 with non-bias, b(z) ≡ 1 best reproduce the AGN clustering results, while τCDM models with different bias behaviour are ruled out at a high significance level.
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