演講資訊

摘要：

Galaxy clusters are continuously growing up on the formation of the large-scale structure in the Universe. Most of the galaxy clusters host a cool core in their center, which is composed of dense, relatively cool, and metal-rich X-ray emitting gas so-called intracluster medium (ICM). Recently, a spiral-like feature is found in some of the cool cores after subtracting the mean surface brightness profile. This feature indicates the presence of gas motion so-called gas sloshing. However, the systematic study of gas sloshing has not been done yet, which is important to understand the origin of the cool core and its stability. In this talk, I will present our recent study of gas sloshing focusing on the sample of galaxy clusters (CLASH: Cluster Lensing And Supernova survey with Hubble). By selecting the cool cores in the CLASH sample, we measure the thermodynamic property of the ICM in the cool core using the Chandra X-ray Observatory. We then find a gas perturbation in all of the cool cores. I will discuss the origin of gas perturbation and its relationship with gas sloshing.