Home / Colloquium / Extragalactic Archaeology: Galaxy Formation and Nucleosynthesis
March 22, 20212:45 pm – 3:45 pm (CDT)
Extragalactic Archaeology: Galaxy Formation and Nucleosynthesis
Evan Kirby (California Institute of Technology)
Galactic archaeology is the use of the velocities and abundances of stars to learn about the history of galaxy formation and nucleosynthesis. I will tell two stories of extra-galactic archaeology with two different groups of elements: alpha elements and the iron peak. First, I will present detailed abundances of individual stars in the dwarf satellites, stellar streams, and smooth halo of M31. The evolution of [alpha/Fe] in these stars supports the hierarchical assembly paradigm of galaxy formation. Second, I will present abundances of manganese and nickel in dwarf satellite galaxies of the Milky Way. These abundances are best explained by a strong contribution of sub-Chandrasekhar-mass Type Ia supernovae.