A Model for Gas Dynamics and Chemical Evolution of the Fornax Dwarf Spheroidal Galaxy

Abstract: In this talk, I will briefly summarize my PhD work on Fornax dwarf spheroidal galaxy, the brightest satellite dwarf galaxies of Milky Way. I will focus on the gas dynamics of Fornax dSph in part I of my talk according to the first paper of this series (http://arxiv.org/abs/1503.00780). We take a novel approach to construct the gas evolution history of Fornax based on its known star formation history (SFH). The halo growth history and infall time of Fornax can be also inferred, which are in broad agreement with previous studies using data on its stellar data and its orbital motion. In Part II of this talk, I will show the chemical evolution model for Fornax based on the gas physics picture (http://arxiv.org/abs/1512.05552). Using supernova nucleosynthesis yields as input, I simulated stochastic and inhomogeneous mixing of newly-synthesized elements by supernovae and compare the results with the observed metallicity distributions and scatter in abundances of individual elements of e.g., Mg, Si, Ca, Ti, and Fe. I found that this mixing depends on large-scale gas flows, the clumpy structure of the ISM, and the differences between environments of core-collapse and Type Ia supernovae. in Part III, I'd like to show you our current work on MW satellites with my collaborator Zhaozhou Li (SHAO). From dark matter only simulations, we are able to obtain the distribution of infall time for each dwarf satellite knowing its distance and velocity. Besides of that, the distribution of eight brightest dwarfs in angular momentum and binding energy space would give us some constrains of MW mass.