The black hole population in low-mass galaxies in large-scale cosmological simulations

• DOI: 10.1093/mnras/stac1659
• Publication Date: 2022-06-16T20:12:56Z
• Authors: Houda Haidar; Mélanie Habouzit; Marta Volonteri; Mar Mezcua; Jenny Greene; Nadine Neumayer; Daniel Anglés-Alc...; Ignacio Martin-Na...; Nils Hoyer; Yohan Dubois; Romeel Davé
• Keywords: Stellar mass

Recent systematic searches for massive black holes (BHs) in local dwarf galaxies led to the discovery of a population faint Active Galactic Nuclei (AGN). We investigate agreement BH and AGN populations Illustris, TNG, Horizon-AGN, EAGLE, SIMBA simulations with current observational constraints low-mass galaxies. find that some these produce BHs are too massive, occupation fraction at z=0 is not inherited from simulation seeding modeling. The ability their host power an depends on galaxy subgrid used calibrate simulations, thus can be differentiate formation models. fractions span two orders magnitude fixed stellar mass similarly constraints, but uncertainties degeneracies affect both observations simulations. difficult interpret due differences masses simulated observed BHs, affected by numerical choices, unknown obscured AGN. Our work advocates more thorough comparisons improve modeling cosmological our understanding physics regime. efficiently accrete gas, have important implications build-up entire time.