Title: Dinosaurs from the very Metal-Poor (Old) Milky Way

Speaker: Dr. Yuan Zhen (Strasbourg Observatory, CNRS, France)

Time: 14:00pm, Jun 6, 2023

Location: 5-516, PMO Xianlin Campus

Abstract: As the witnesses of the early Universe, dwarf galaxies, especially the low-mass ones (total mass ≤ 10^9 M⊙), carry the imprint of essential physical processes, from the formation of the first stars to the formation of the first galaxies, which shaped the universe into the one we observe today. I will show the power of searching dwarf galaxy debris in the very metal-poor (old) Milky Way, and how their detailed elemental abundances unveil stellar nucleosynthesis and galactic chemical evolution at high redshift. I will also briefly talk about my recent work of calibrating narrow band CaHK photometric data from 11,000 CFHT images to search for the very metal poor stars in the MW. In the second part of my talk, I will show our predicted dwarf galaxy detection limit of the CSST, which is an optimal tool by design to search for low-mass/faint dwarf galaxies within the Local Volume.