University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Wednesday, March 11th 2015
1:25 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Zhen Yuan, University of Minnesota
Subject: Chemical Evolution Model of Fornax Spheroidal Dwarf Galaxy

Observations strongly indicate that chemical enrichment in nearby dwarf spheroidal galaxies (dSphs) remains inhomogeneous until the end of their star formation despite their small size. Motivated by this unsolved problem, I built a chemical evolution model for Fornax, the brightest dSph in Milky Way, based on its star formation history. I simulated stochastic and inhomogeneous mixing of newly-synthesized elements by supernovae and compared the results with the observed metallicity distributions and scatter in abundances of individual elements of e.g., Mg, Si, Ca, Ti, and Fe. This approach not only can test supernova nucleosynthesis models, but also provides insights into mixing of supernova ejecta with the interstellar medium. I found that this mixing depends on large-scale gas flows, and the differences between environments of core-collapse and Type Ia supernovae.

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