Title:  Turbulence and non-thermal pressure in galaxy clusters 

　　Speaker: Xun Shi  (石洵, Yunnan University) 

　　Time: 10:00 am, April 19 (Friday) 

　　Location: Lecture Hall, 3rd floor 

　　Abstract: Galaxy clusters are promising probes for cosmology, and yet, their astrophysical complexity leads to significant systematical bias as shown by the Planck CMB-cluster discrepancy. Turbulence in the intracluster medium (ICM) and the corresponding non-thermal pressure are a central piece of the astrophysical complexity that has not been well-explored. I will present recent developments in this area, and in particular, discuss a largely neglected effect - the influence of ICM density stratification on turbulence dissipation, as well as its role in shaping the typical radial distribution of ICM turbulence.