Title: Gas in and around high-z galaxies: link to the baryonic cycle
Abstract: Gas in and around a galaxy is of critical importance in regulating galaxy formation and evolution. A galaxy grows through the accretion of cold intergalactic gas, which fuels star formation. Part of the gas is back to the so-called circumgalactic medium (CGM) via galactic-scale outflows, driven by massive stars, supernovae, and active galactic nuclei. My research aims to address the question, How the gas in and around high redshift galaxies regulate star formation and galaxy evolution. My past and current research have helped to answer this question on the following aspects: (1). The cold gas traced by neutral atomic carbon has a direct association with molecular gas, thus, star formation at z ~ 2. (2). The cool gas traced by strong Mg II in the circumgalactic medium (CGM) tends to reside in a more disturbed environment and has
a smaller absorbing gas size at 2< z <6 than that at z < 1. (3). We can potentially probe the nature and nucleosynthesis of the earliest generations of stars using the metal-poor gas.