时间：2025年9月17日（星期三）上午10:30-11:30

Time: 10:30-11:30, September 17th (Wednesday, Beijing Time), 2025

主持人：西湖大学天文系讲席教授 毛淑德

Host: Prof. Shude Mao, Chair Professor, School of Science

地点：西湖大学云谷校区E10-212

Venue: E10-212, Yungu Campus, Westlake University

报告语言：英语

Language: English

Dr. Glenn van de Ven，

Full Professor of University of Vienna, Head of the Department of Astrophysics, 

Director of the Vienna International School of Earth and Space Sciences

主讲人/Speaker:

Dr. Glenn van de Ven is currently a full professor of University of Vienna, head of the Department of Astrophysics, director of the Vienna International School of Earth and Space Sciences. Prior to this, he was a Faculty Astronomer at the European Southern Observatory (ESO) in Germany and a tenured Research Group Leader at the Max Planck Institute for Astronomy in Heidelberg. He held prestigious postdoctoral fellowships at Princeton University and the Institute for Advanced Study after obtaining his Ph.D. in Astronomy from Leiden University in 2005.

摘要/Abstract:

Driven by gravity, galaxies continuously grow through accretion of smaller systems. Stellar streams are nice illustrations of this hierarchical build-up, but the accreted stars quickly disperse. I will present advanced dynamical models that can convert the observed positions and velocities of stars to phase-space quantities like energy and angular momentum which remain largely conserved. In addition, these models can include the observed ages and chemical properties of stars which are also conserved. The resulting population-dynamical models allow us then to uncover even those accretion events which are now fully dispersed. At the same time, these models also accurately constrain the total mass distribution, including a central black hole and dark matter halo.

I will illustrate how these models make optimally use of observations to unveil the dark side and colour past of galaxies: from accurate measurements of their central black holes and extended dark halos, to unveiling the formation history of their disks, to uncovering ancient massive mergers and accreted satellite galaxies. By the end, I aim to have demonstrated that these models provide a unique bridge between the studies of resolved stars in the Milky Way and integrated-light of high(er)-redshift galaxies. Together with direct coupling to state-of-the-art galaxy formation simulations, these population-dynamical models enable us to uncover the hierarchical build-up of galaxies in a cosmological context.

联系人/Contact:

School of Science, Yannan Yu, Email: yuyannan@westlake.edu.cn