Covering Factor of AGN at z ∼ 1

The dusty torus in the Active Galactic Nuclei (AGN) has a major impact on the physical characteristics of AGN. In this proceeding we measure the covering factor (CF) which is defined as the fraction of the AGN's central light obscured by the dusty torus. It is often estimated from a ratio of AGN's infrared and bolometric luminosities (L_IR and L_BOL, respectively). Based on a sample of 9030 AGN at 0.7≤ z ≤ 1.1 selected from the SDSS database with auxiliary IR and UV measurements, we confirm the existence of the tight correlation between L_IR and L_BOL, and we estimate the median value of CF for this sample to be 0.65±.16. Possible explanations of L_IR and L_BOL correlation are discussed.