报告题目：Clusters of Galaxies in X-ray

　　报 告 人：Dr. Yuanyuan Su (University of California, Irvine)

　　报告摘要：The standard model of cosmology, a universe dominated by cold dark matter, directly predicts that bounded systems on various scales -- galaxies, groups of galaxies, and clusters of galaxies -- evolved from a near-uniform Big Bang through hierarchical formation. Such a scenario naturally gives rise to questions such as how well can self-similarity hold for systems on different scales and what is the role played by baryon physics in their evolution. 90% of the baryons in galaxy groups and clusters are in the form of hot gas emitting in X-rays through bremsstrahlung radiation. Together, three ongoing major X-ray missions (Chandra, XMM-Newton and Suzaku), with different advantages to complement each other, enable us to study various physics and over a wide range of physical parameters. I will talk about recent studies of baryon physics in clusters and groups, such as gas fraction, gaseous clumpiness, AGN feedback, ram pressure, and metal enrichment.

  　时    间：2014年3月24日星期一 上午10:00

　　地    点：紫台大楼619会议室

　　联 系 人：李月月（83332162）

欢迎大家积极参加！ 

　　　　                             紫金山天文台学术委员会学术交流工作委员会