Time: 12:00pm~12:55pm, December 27 (Wednesday)
Speaker: 胡家瑜 博士後研究員
Dr. Chia-Yu Hu, Postdoctoral associate
Affiliation: Department of Astronomy, University of Florida
Venue: Science Building III 3F SC353
Computational galaxy formation has been remarkably successful in reproducing realistic galaxies using cosmological simulations, where a smooth mixture of gas and dark matter in the early Universe gradually evolves into thousands of galaxies due to gravity and hydrodynamics. The key to this success is the “feedback” processes that drive the cycling of gas and heavy elements in and around galaxies. However, all existing cosmological simulations face a fundamental limitation in their robustness as they adopt empirical “sub-grid” models tuned to reproduce observations. In this talk, I will discuss recent progress in galaxy-scale simulations that resolve the interstellar medium (ISM) as a promising alternative approach to understanding galaxy formation. Specifically, I will focus on three interconnected aspects: (1) How stellar feedback regulates star formation and drives galactic outflows and the implications to the nature of dark matter (2) How chemistry in the ISM connects theory with observations and how it changes with metallicity; (3) How dust evolves and affects the ISM chemistry. I will conclude by describing future prospects for developing physical sub-grid models for next-generation cosmological simulations that can be used to study fundamental physics.