报告题目：Detecting Hot Gas in the Universe

　　报告人：Dan McCammon(Physics Dept., University of Wisconsin, Madison WI USA)

　　摘要：We live in a hot Universe. More than 80% of all normal matter is at temperatures above a half million degrees, where it can readily be observed only in X rays. Study of hot gas is needed to locate the "missing baryons" and verify standard theories of structure formation, to understand feedback regulation of star formation, and to understand metal transport in the intergalactic medium, from clusters and individual galaxies, and within our Galaxy. I will discuss the instrumental difficulties of making these observations, and progress being made in overcoming them.

　　时间地点：6月30日（周四）下午2点，天文楼212

欢迎各位老师、同学参加！

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