Title: The Milky Way in the Era of Galacto-seismology/ 银震学时代的银河系研究

Speaker: 李兆聿

Institute:  上海交通大学

Host: 于浩然，杜敏

Time: 12.21 周四 14:30

Location: 物理楼552

Abstract: 

Gaia data has revolutionize our understanding of the Milky Way. With accurate position and velocity measurements for millions of stars in Gaia, a new era— Galacto-seismology has arrived. In this talk, I will first briefly review the recent progress in the phase space study of the Milky Way disk, and then focus on a specific phase space feature — the z-Vz phase snail. Interestingly, important physical parameters regarding the Milky Way formation and evolution can be deduced by analyzing these snails. Recently, we have successfully used this snail to estimate the time of the last pericenter passage of the Sgr dwarf galaxy, and to provide the first non-parametric constraint on the Galactic disk potential. In the future, with more data coming, we can combine different phase space structures to better portrait the Galactic evolution history.

Bio：

2002-2006, bachelor, Department of Astronomy, Peking University

2006-2011, PhD, Department of Astronomy, Peking University

2011-2013, Postdoc, Shanghai Astronomical Observatory

2013-2019, Associate Researcher Fellow, Shanghai Astronomical Observatory

2019-Now, Professor, Shanghai Jiao Tong University

Zhaoyu received the National Excellent Youth Fund in 2022, and lead one of the China Space Station Survey Telescope Science Research Projects. His main research interests are the dynamics of the Milky Way and the formation and evolution of galaxy structures. Currently, he has published 40 SCI papers with over a thousand citations.

References:

https://ui.adsabs.harvard.edu/abs/2020ApJ...890...85L/abstract

https://ui.adsabs.harvard.edu/abs/2021ApJ...911..107L/abstract

https://ui.adsabs.harvard.edu/abs/2022ApJ...936..103G/abstract

https://ui.adsabs.harvard.edu/abs/2023arXiv231010225G/abstract