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Colloquium – Leandro Beraldo e Silva’s “Co-formation of the Milky Way’s Thin and Thick Discs”
February 16, 2023 @ 12:45 pm - 1:45 pm
“Co-formation of the Milky Way’s Thin and Thick Discs”
Abstract:
Thin disc stars are younger than thick disc stars on average, and some models predict the thin disc to start forming only after the thick disc has formed, around 10 Gyr ago. According to these sequential scenarios, no significant old thin disc population should exist. In this talk, I will show recent observational evidence for the presence of an old thin disc in the MW. I will discuss how the observed trends disfavour sequential scenarios but can be nicely accommodated in a scenario where the early MW had massive gas clumps with high star formation. Incidentally, I will also show evidence for radial migration in both thin and thick disc populations in the MW.
Dr. Leandro Beraldo e Silva, University of Michigan
Thursday, February 16, 2023 @ 12:45 PM – 1:45 PM EST
217 Bryant Space Science Center