Title：Modeling the formation of dark-matter deficient galaxies

Speaker：Zhaozhou Li (Hebrew University of Jerusalem)

Location：small conference room, 3rd floor

Time：28 June Wednesday, 10:00am - 11:00am

Abstract：

Recent observations reported a puzzling dearth of dark matter (DM) in a fraction of massive high-z galaxies and dwarf galaxies, challenging current simulation predictions within the standard ΛCDM scenario. This discrepancy underscores our limited understanding of the dynamics of halo/galaxy structural evolution driven by e.g., feedback outflows, mergers, and tidal stripping. Here I will present a new unified and precise analytical model to understand the above processes. Using this model, I will show how to create DM-deficient high-z massive galaxies via dynamical heating by infalling satellites followed by DM expansion in response to AGN-driven outflows. The same framework can also generate DM-deficient dwarf galaxies through supernova feedback and tidal stripping. Given the universality of the violent relaxation process, our model promises extensive applications for general dynamical problems.

CV：

I am a Marie Sk？odowska-Curie fellow at The Hebrew University of Jerusalem. Before moving to Israel, I was a postdoctoral researcher at Shanghai Jiao Tong University (2018-2021) and a graduate student at Shanghai Astronomical Observatory (2011-2017). My research interests include galactic dynamics, dark matter halo and subhalos, the Milky Way and its satellite galaxies. See more information on my website https://syrte.github.io/.