Lunch talk on Jun. 13, 2022

Towards a Complete Picture of Galaxy Build-up at the First 3 Billion Years

Speaker: Mengyuan Xiao (NJU)

Venue: Video Conference

Time: 12:30 PM, Monday, Jun. 13, 2022

Abstract: 

One of the major challenges in astrophysics is to understand how galaxies assemble their mass over time, and how this assembly depends on their internal evolution and/or external factors such as dark matter haloes, gas accretion, and galaxies mergers. In this talk, I will present our recent projects as well as future plans, based mainly on the ALMA and JWST telescopes, to explore how galaxies got built up in the early Universe. I will start with a general view of the cosmic star formation rate density, focusing on a missing population of optically-dark/faint galaxies in our GOODS-ALMA field, which are dust-obscured and missed by previous UV selection techniques. I will then move to a detailed picture of star formation. By studying the molecular gas kinematics of two starburst galaxies in the most distant young galaxy cluster at z=2.5, I will try to answer the question what causes starbursts in the early Universe? Finally, I will briefly describe our future plans based on the JWST data, which stem from my recent discoveries.

Report PPT:  SWIFAR_Mengyuan Xiao.pdf