Title: Missing Baryons: Insights from the Multiphase Circumgalactic Medium

Speaker: 屈稚杰

Institute:  芝加哥大学

Host: 武剑锋

Time: 12.21 周四 16:00

Location: 物理楼552

Abstract: 

In the galactic ecosystem, the circumgalactic medium (CGM) is a massive baryon reservoir orchestrating baryonic inflows and outflows, shaping galaxy formation and evolution. Of profound significance is the swift quenching of cosmic star formation rates since cosmic noon, pivotal in unraveling present-day galaxy characteristics, yet its driving force remains uncertain. Characterizing and modeling the CGM emerges as a powerful tool for understanding this crucial transition. In this talk, I will introduce observational constraints on the multiphase CGM using multiwavelength probes. In particular, I will explore the spatial distribution of different phases, aiming to answer a fundamental question, do galaxies host all of their baryons within their halos? With the most extensive multiwavelength observations, the Milky Way is of special interest in resolving the missing baryons problem. I will introduce recent progresses on modeling of MW multiphase gas.

Bio：

Zhijie Qu is a KICP Associate Fellow at the University of Chicago, before which he obtained his PhD from the University of Michigan in 2021. Since his PhD, he has been working on observations and modeling of multi-phase circumgalactic medium. His research aims to investigate fundamental accretion and feedback processes shaping galaxy formation and evolution.

References:

https://ui.adsabs.harvard.edu/abs/2015ApJ...800...14M/abstract

https://ui.adsabs.harvard.edu/abs/2019ApJ...880...89Q/abstract

https://ui.adsabs.harvard.edu/abs/2019ApJ...871...35Z/abstract

https://ui.adsabs.harvard.edu/abs/2022MNRAS.516.4882Q/abstract