Title: Investigation of galaxy-dark-matter connections using numerical and semi-analytical methods 

Speaker: Fangzhou Jiang

Abstract: In our standard understanding of the Universe, dark matter amounts to 85% of the total matter density and forms gravitationally bound structures -- dark halos. Halos interact and merge with each other to form larger structures, and provide the sites for galaxy formation and evolution. Galaxy properties are therefore related to the properties of their hosting dark halos, primarily the halo mass, but also depend on the structural, environmental, and temporal information of the halos. In this talk, I will begin by an overview of galaxy-halo connections in the context of cosmological small-scale puzzles and extreme dwarf galaxies. I will then present in-depth analysis of cosmological hydrodynamical simulations to quantify the halo conditions for forming disk galaxies and to explore disk-size predictors from the dark sector. Finally, I will show a work in progress on a new category of galaxies of extreme morphology at high-redshift, Giant Bulgeless Disks, and reveal their formation conditions at the cosmic morning.

Bio: Dr. Fangzhou Jiang is an assistant professor at the Kavli Institute for Astronomy and Astrophysics, Peking University. He obtained his PhD from Yale University in 2016, and was a PBC Fellow in the Hebrew University of Jerusalem from 2016 to 2019, a Troesh Scholar at Caltech with a jointly appointed Theory Fellow at the Carnegie Observatories from 2020 to 2022, before joining KIAA in 2023. Fangzhou carries out theoretical and computational studies of galaxies and cosmology. His research programs aim at a comprehensive theoretical picture of dark-matter halos and their interplay with inhabitant galaxies across the history of the Universe, with the ultimate goal being to constrain the properties of dark matter and to understand galaxy evolution all the way from the cosmological large scales down to sub-galactic small scales.  

Homepage: fzjiang.com

Time: 14:00-15:00, 23/Oct, Wednesday

Venue: Room 506 (Large seminar room), Department of Astronomy