Three members from the Department of Astronomy have received joint appointments at KIAA. Professor Fukun Liu works on supermassive black hole binaries, accretion disks and active galactic nuclei. Professor Zuhui Fan works on cosmology, gravitational lensing and galactic dynamics. Professor Renxin Xu is an expert on particle astrophysics, including the study of pulsars, quark stars and other compact objects.