学术报告第416期:The Stellar "Snake" and the Related Sciences
星期四,2023/11/30-15:00-16:00
主讲人 (Speaker):田海俊
主讲人单位 (Speaker's Institute): 杭州电子科技大学
邀请人 (Invited by): 李程远
时间 (Time): 星期四,2023/11/30-15:00-16:00
地点 (Location): 珠海校区瀚林3号B431会议室
摘要 (Abstract):
In 2020, we reported the discovery of a young (only 30-40 Myr) snake-like structure (dubbed a Stellar “Snake”) in the solar neighborhood from Gaia DR2. The average distance of this structure is about 310 pc from us. Both the length and width are over 200 pc, and the thickness is about 80 pc. The “Snake” has one tail and two dissolving cores, which can be clearly distinguished in 6D phase space. The population is so young that it cannot be well explained with the classical theory of tidal tails. We therefore suspect that the “Snake” is hierarchically primordial, rather than the result of dynamical tidal stripping, even if the “snake” is expanding. In 2022, we extended the size of the “Snake” to more than two times its length, making the number of its member candidates totaling to over ten thousand. This finding will provide us an ideal test bed to study the stellar formation and evolution in cluster environments with one uniform population.
In this talk, I will present a panoramic view on the structure and properties of the “Snake”, and demonstrate several science cases of the “Snake” we are developing recently.
主讲人简介 (Speaker's CV):
田海俊,教授,博导,湖北省天文学会副理事长,湖北省杰出青年基金获得者,美国约翰斯·霍普金斯大学(JHU)、德国马克思·普朗克天文所(MPIA)访问学者。长期以来,利用LAMOST、Gaia等巡天大样本数据,围绕银河系结构、化学、运动学及天体测量学开展了系列研究工作。先后主持国家自然基金五项,参与国家重点基金一项,发表学术论文30余篇,其中多项研究成果被天文和物理领域重要的年鉴性评论期刊《天文学和天体物理学年度评论》、《核与粒子科学年度评论》等收录及亮点评述。相关成果获湖北省自然科学奖二等奖(第一完成人)、IOP出版集团Top Cited Paper Awards China (2020-2022)。
