Zhen Yuan -- Galaxy Archaeology with Stellar Streams via High Resolution Spectroscopy

Abstract:

As the witnesses of the early Universe, dwarf galaxies, especially the low-mass ones, 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 low-metallicity Milky Way, and how their detailed elemental abundances unveil stellar nucleosynthesis and galactic chemical evolution at high redshift. Specifically, I will talk about the very metal-poor Cetus stream and the extremely metal-poor C-19 stream which have distinct progenitor properties revealed by high-resolution spectroscopy.