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A common challenge to semi-analytic galaxy formation models as well as hydro-dynamical simulations is to reproduce the observed quenched fractions. Ten years ago, theoretical models significantly over-predict the quenched fractions for low-mass satellite galaxies. As the understanding of internal feedback, environmental effects and their combined effects on star formation activity improve, the model predictions have been improved but remained far from satisfactory. In this talk, I will introduce the series of GAEA model and the physical processes that are required to reproduce observational measurements. Specifically, we implement modified stellar feedback, gradual stripping of hot gas, ram-pressure stripping of cold gas, and an updated algorithm to account for angular momentum exchanges between the gaseous and stellar disc components of model galaxies. Our updated model is consistent with local observational measurements of quenched fractions, HI fractions, and H2 fractions for central and satellite galaxies. I will also introduce the dominant quenching mechanisms and the reason for stellar mass and halo mass dependences in the framework of our updated model.
Dr. Lizhi Xie currently serves Tianjin Normal University as a lecturer. She received PhD degree from NAOC at 2015, then worked in INAF - Astronomical Observatory of Trieste as a Postdoc until 2018. Lizhi mainly works on semi-analytic galaxy formation models. Her research interests include environmental effects on galaxies and multi-phase gas of galaxies.