Effects of Active Galactic Nucleus Feedback on Cold Gas Depletion and Quenching of Central Galaxies

Abstract

We investigate the influence of active galactic nucleus (AGN) feedback on the galaxy cold gas content and its connection to galaxy quenching in three hydrodynamical simulations of Illustris, IllustrisTNG and SIMBA. By comparing to the observed atomic and molecular neutral hydrogen measurements for central galaxies, we find that Illustris over-predicts the cold gas masses in star-forming galaxies and significantly under-predicts them for quenched galaxies. IllustrisTNG performs better in this comparison than Illustris, but quenched galaxies retain too much cold gas compared with observations. SIMBA shows good agreement with observations, by depleting the global cold gas reservoir for quenched galaxies. We find that the discrepancies in IllustrisTNG are caused by its weak kinetic AGN feedback that only redistributes the cold gas from the inner disks to the outer regions and reduces the inner cold gas densities. It agrees with observations much better when only the cold gas within the stellar disk is considered to infer the star formation rates. From dependences of cold gas reservoir on the black hole mass and Eddington ratio, we find that the cumulative energy release during the black hole growth is the dominant reason for the cold gas depletion and thus the galaxy quenching. We further measure the central stellar surface density within 1 kpc (${\Sigma }_1$) for the high-resolution run of IllustrisTNG and find a tight correlation between ${\Sigma }_1$ and black hole mass. It suggests that the observed decreasing trend of cold gas mass with ${\Sigma }_1$ is also a reflection of the black hole growth.

20 pages, 14 figures. Accepted by ApJ

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• Multi-Epoch Machine Learning 2: Identifying physical drivers of galaxy properties in simulations
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• Dissecting the mass quenching in TNG50: Galaxy size determines the quenching mode
• Investigating the residuals in the $M_{\bullet }-M_{\ast }$ relation using the SIMBA cosmological simulation
• Recent Developments on the HI Gas of Low-Redshift Galaxies Seen by the 21cm Emission Lines
• Galaxy and black hole coevolution in dark matter haloes not captured by cosmological simulations
• NeutralUniverseMachine: Predictions of HI gas in Different Theoretical Models
• The History of Galaxy Mergers in IllustrisTNG