Virtual only -- To Join via Zoom
Identifying and understanding the physical mechanisms responsible for star formation and quenching are key challenges in modern astronomy. For instance, black hole feedback has been widely implemented as the key recipe to quench star formation in massive galaxies in modern semi-analytic models and hydro-dynamical simulations. As the theoretical details surrounding the accretion and feedback of black holes continue to be refined, various feedback models have been implemented across simulations, with notable differences in their outcomes. Yet, most of these simulations have successfully reproduced some observations, such as stellar mass function and star formation rate density in the local Universe. I will first present new observations on the cold gas in galaxies at various stages of their evolution. Then I will show the use of these observations as critical tests of star formation and black hole feedback models in simulations, and discuss the implications.