Phase Space Structure in the Era of Galactoseismology

Gaia first discovered the snail shell structure in the Z-Vz phase space of stars in the Milky Way disk, suggesting that the disk was perturbed and dynamically young. This represents the beginning of a new promising research field, i.e., ‘Galactoseismology’, where we can study the Galactic structure formation and evolution history using the phase space signals. In this talk, I will first introduce the physical background of the phase space snail shell. Then I will describe our recent works related to such phenomenon: 1) we found that the phase snail can only be seen in dynamically colder orbits; 2) the phase snail is more prominent when the stars are grouped into different guiding radius; 3) the vertical potential profiles could be constructed based on the phase snail.

Zhaoyu LI (SJTU)
Luis Chi Ho
Thursday, July 22, 2021 - 4:00PM to Thursday, July 22, 2021 - 5:00PM
2002-2006, B.S., Peking University 2006-2011, Ph.D., Peking University, thesis advisor (Luis Ho, Xuebing Wu) 2011-2013, Postdoc, Shanghai Astronomical Observatory 2013-2019, Associate Research Fellow, Shanghai Astronomical Observatory 2019-present, Assistant professor, Shanghai Jiao Tong University