Colloquium on Sep. 19th, 2019
The Spiral Structure of the Milky Way
Speaker: Ye Xu (PMO)
Venue: Room 2111, SWIFAR Building
Time: 10:00 AM, Thursday, 19th September, 2019
Abstract:
Currently, the high accurate astrometry is carrying out an important scientific object mapping the Milky Way Using trigonometric parallax, two large projects, the Bar and Spiral Structure Legacy BeSSeL Survey and the Japanese VLBI Exploration of Radio Astrometry, are mapping up to 500 maser sources associated with star forming regions in recent years, with accuracies typically about 20 uas and some as good as 5 uas The aim is to construct the spiral structure and three dimension 3 D) motions of the Milky Way, and then determine the rotation curve and distribution of dark matter based on the motions.