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      1. 學術活動
        Phase Space Structure in the Era of Galactoseismology
        主講人: Zhaoyu LI (SJTU)
        地點: KIAA-auditorium
        時間: Thursday, July 22, 4:00PM-5:00PM
        主持 聯系人: Luis Chi Ho
        主講人簡介: 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

        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.