题目: The spiral structure of the Milky Way
报告人: 徐烨 研究员, 中科院紫金山天文台
时间地点: 周四, 2019.2.21下午2:30-4:30, 物理楼552
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 (VERA), 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 (3D) motions of the Milky Way, and then determine the rotation curve and distribution of dark matter based on the motions.