报 告 人：郑兴武教授（天文与空间科学学院）

　　报告题目：The Impact of Extremely High Accuracy VLBI Astrometry on Astrophysics

　　报告摘要：Recent advances in radio astrometry with the VLBI have produced images with angular resolution of order 100 uas, the absolute and relative astrometric accuracies have yielded about 1 mas and 10 uas respectively, the position of radio telescope can be measured better than 1 cm, and vertical atmospheric delay measurement exceeding 10 ps can also be achieved. These unique capabilities of extremely high accuracy VLBI astrometry have led to wide-ranging application in astrophysics and geophysics. In my talk, I will introduce 3 ambitious projects of extremely high accuracy VLBI astrometry (MCP,BeSSeL and PSRpi) and review preliminary astrophysical results, including measurement of the Hubble constant, the masses of the massive black holes, the bar and spiral structure of the Milky Way, the distances of pulsars and so on. I will also discuss future applications of extremely high accuracy VLBI astrometry in astrophysics.

　　时    间：12月20日（周五）下午15：30

　　地    点：南京大学苏富特三楼会议室

欢迎各位老师、同学参加！

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