Title: Obscured AGN Demography through Cosmic Time: Results from the Chandra Deep Field-South 

Speaker: Yongquan Xue (USTC) 

Time & Place: Thursday, 3:00pm, April 10th, Lecture Hall, 3rd floor  

Abstract: Highly obscured active galactic nuclei (AGNs) escaping even the deepest X-ray surveys are often thought to be comparably numerous to unobscured and moderately obscured AGNs. These sources are necessary for fitting the cosmic X-ray background emission in the 10-30 keV band and play a crucial role in the black hole/galaxy evolution history. In this talk I present, in a personal point of view, some recent efforts in searching for highly obscured AGNs in the Chandra Deep Field-South (CDF-S). I discuss the properties and implications of the highly obscured AGNs/AGN candidates identified through these efforts. I also discuss future prospects to identify more highly obscured AGNs/AGN candidates. 

Biog: Yongquan Xue received his BSc. in July 2000 and MSc. in July 2003 from Peking University. He obtained his PhD from Purdue University in May 2008 and then worked as a postdoc at the Pennsylvania State University. In May 2012 he was selected by the national Thousand Young Talents Program and has since worked as a professor in the Department of Astronomy, University of Science and Technology of China. His main research interests are to utilize deep multi-wavelength surveys to study AGN demography, physics, feedback, and evolution, as well as coeval growth and coevolution of galaxies and supermassive black holes.