报告题目：The clustering of AGN in the low-z Universe

　　报告人：李成 教授 （清华大学）

　　报告人简介：Cheng Li is currently a Professor of Astrophysics at Tsinghua Center for Astrophysics (THCA) of Tsinghua University in Beijing. He completed his undergraduate and graduate studies at University of Science and Technology of China (USTC), and obtained PhD at USTC in 2006. He worked at Shanghai Astronomical Observatory (SHAO) and then Max-Planck Institute for Astrophysics (MPA) as a joint postdoc, before he moved back to SHAO in 2010 to lead the Max-Planck Institute Partner Group from 2011-2015. He moved to his current job in September, 2015. Cheng's current research interests include the structure, formation and evolution of galaxies, the cold gas content and star formation quenching in galaxies, and the large-scale structure. He is involved in the Sloan Digital Sky Survey IV project (SDSS-IV) and the Subaru Prime Focus Spectrograph project (PFS).

　　摘要：Galaxies are not distributed at random. Rather, they are highly clustered, following closely the distribution of dark matter on large scales and depending strongly on the physical properties of galaxies. Studies of the clustering as a function of galaxy properties should in principle provide interesting constraints on the physical link between galaxies and their host dark matter halos. Indeed, this has been one of the key goals of the many large redshift surveys of galaxies accomplished so far. In this talk I will focus on the clustering of active galactic nuclei (AGN) in the Sloan Digital Sky Survey (SDSS) on a wide range of spatial scales from the regime of galaxy-galaxy interactions up to the linear regime. We studied both optically-identified narrow-line AGN and radio-loud AGN falling in the SDSS footprint. Through constructing halo-based models we're able to estimate the dark matter halo mass, and constrain the local environment where AGN are preferentially found. I will also discuss the implications of the clustering measurements on the AGN unification model.

　　时间：4月28日（周五）上午10点

　　地点：天文楼212报告厅

欢迎各位老师、同学参加！

　　                                                   南京大学天文与空间科学学院