Co-Evolution vs. Co-existence: The Effect of Accretion Modelling on the Evolution of Black Holes and Host Galaxies

Abstract

We append two additional black hole (BH) accretion models, namely viscous disc and gravitational torque-driven accretion, into the Numerical Investigation of a Hundred Astrophysical Objects (NIHAO) project of galaxy simulations. We show that these accretion models, characterized by a weaker dependence on the BH mass compared to the commonly used Bondi-Hoyle accretion, naturally create a common evolutionary track (co-existence) between the mass of the BH and the stellar mass of the galaxy, even without any direct coupling via feedback (FB). While FB is indeed required to control the final BH and stellar mass of the galaxies, our results suggest that FB might not be the leading driver of the cosmic co-evolution between these two quantities; in these models, co-evolution is simply determined by the shared central gas supply. Conversely, simulations using Bondi-Hoyle accretion show a two-step evolution, with an early growth of stellar mass followed by exponential growth of the central supermassive black hole (SMBH). Our results show that the modelling of BH accretion (sometimes overlooked) is an extremely important part of BH evolution and can improve our understanding of how scaling relations emerge and evolve, and whether SMBH and stellar mass co-exist or co-evolve through cosmic time.

13 pages, 10 figures

References in corpus (11)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• The Illustris simulation: the evolving population of black holes across cosmic time
• Direct cosmological simulations of the growth of black holes and galaxies
• Evidence for powerful AGN winds at high redshift: Dynamics of galactic outflows in radio galaxies during the "Quasar Era"
• How Mergers May Affect The Mass Scaling Relations Between Black Holes, Galaxies, and Other Gravitationally Bound Systems
• Fueling Low-Level AGN Activity Through the Stochastic Accretion of Cold Gas
• The Evolution of AGN Host Galaxies: From Blue to Red and the Influence of Large-Scale Structures
• NIHAO X: Reconciling the local galaxy velocity function with Cold Dark Matter via mock HI observations
• The angular momentum of baryons and dark matter halos revisited
• Supermassive Black Holes and Their Environments
• Momentum-driven feedback and the Mass-sigma relation in non-isothermal galaxies