| Time：1140924 (Wed.) 14:20~16:20 Speaker：Prof.胡家瑜/ Hu, Chia-Yu 國立臺灣大學天文物理研究所/Graduate Institute of Astrophysics, National Taiwan University Title：The Cycle of Gas, Molecules, and Dust in and around Galaxies: a Bottom-up View Abstract： Computational galaxy formation has been remarkably successful in recreating realistic galaxies on supercomputers using a technique called “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 physical processes (collectively called “feedback”) that drive the cycling of gas and heavy elements in and around galaxies. However, all existing cosmological simulations face a fundamental limitation in that the feedback models are highly uncertain and empirical due to insufficient resolution. In this talk, I will describe recent progress on an alternative, bottom-up approach: high-resolution (sub-parsec) simulations of individual galaxies that resolve small-scale processes from first principles. I will focus on two topics: (1) the formation of molecules in the interstellar gas deficient in heavy elements, which has important implications for early-universe galaxies recently discovered by JWST; (2) the launching mechanism of galactic winds driven by supernova explosions, which will shed light on the nature of dark matter. I will conclude with the prospect of developing next-generation cosmological simulations using the results of small-scale, high-resolution simulations. Place：S101, Gongguan Campus, NTNU |
