报告题目：Active Galactic Nuclei in the Chandra Deep Field-South
报 告 人：Dr. Luo Bin
Harvard University
摘 要：I briefly introduce the Chandra Deep Field-South (CDF-S) survey. With a 4 Ms exposure, it is the deepest Chandra survey ever performed; the AGN sky density in this field reaches~10,000 deg^-2. I present our approach to reliably identify and classify the deep field X-ray sources. On the other hand, a significant fraction of the AGN population probably remains undetected even in the dee-pest X-ray surveys, based on studies of the cosmic X-ray background and AGN population synthesis models. These missing AGNs are likely heavily obsc-ured or even Compton-thick, and they are considered to be comparably numer-ous to the unobscured and moderately obscured AGNs. We searched for such AGNs in the CDF-Sutilizing IR, X-ray, and multiwavelength data, and we reve-aled a numerically significant population of X-ray undetected heavily obscured AGNs.
时 间：2011年9月14日（星期三）上午10点
地 点：（北京西路2号）紫台大楼327教室
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