Oral Presentation
Cold Gas in Massive Galaxies as A Contraint of Black Hole Feedback Models
Presenter: Jingjing Shi (Kavli IPMIU)
Black hole feedback has been widely implemented as the key recipe to quench star formation in massive galaxies in modern semi-analytic models and hydrodynamical 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. We use the recent observation on the change of neutral hydrogen gas mass (including both H2 and HI) with star formation rate of massive central disc galaxies as a critical constraint of black hole feedback models across several simulations. We find that the predictions of IllustrisTNG agree with the observations much better than the other models tested in this work. We suspect that this might be mainly credited to IllustrisTNG’s implementation of active galactic nuclei—where kinetic winds are driven by black holes at low accretion rates. In turn, this also indirectly supports the idea that the massive central disc galaxy population in the local Universe was likely quenched by AGN feedback.
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