Supermassive black holes in cosmological simulations I: M_BH-M_star relation and black hole mass function - Archive ouverte HAL Access content directly
Preprints, Working Papers, ... Year : 2021

Supermassive black holes in cosmological simulations I: M_BH-M_star relation and black hole mass function

Melanie Habouzit
  • Function : Author
Yuan Li
  • Function : Author
Rachel S. Somerville
  • Function : Author
Shy Genel
  • Function : Author
Annalisa Pillepich
Marta Volonteri
Romeel Davé
  • Function : Author
Yetli Rosas-Guevara
  • Function : Author
Stuart Mcalpine
Lars Hernquist
  • Function : Author
Daniel Anglés-Alcázar
  • Function : Author
Amy Reines
  • Function : Author
Richard Bower
Yohan Dubois
Dylan Nelson
Christophe Pichon
Mark Vogelsberger

Abstract

The past decade has seen significant progress in understanding galaxy formation and evolution using large-scale cosmological simulations. While these simulations produce galaxies in overall good agreement with observations, they employ different sub-grid models for galaxies and supermassive black holes (BHs). We investigate the impact of the sub-grid models on the BH mass properties of the Illustris, TNG100, TNG300, Horizon-AGN, EAGLE, and SIMBA simulations, focusing on the M_BH-M_star relation and the BH mass function. All simulations predict tight M_BH-M_star relations, and struggle to produce the lowest (M_BH< 10^7.5 Msun) in galaxies of M_star~10^10.5-10^11.5 Msun. While the time evolution of the mean M_BH-M_star relation is mild (<1 dex in BH mass for 010^9 Msun in most of the simulations. The BH mass function is dominated by efficiently accreting BHs (log10 f_Edd >-2$) at high redshifts, and transitions progressively from the high-mass to the low-mass end to be governed by inactive BHs. The transition time and the contribution of active BHs are different among the simulations, and can be used to evaluate models against observations.

Dates and versions

hal-03102302 , version 1 (07-01-2021)

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Melanie Habouzit, Yuan Li, Rachel S. Somerville, Shy Genel, Annalisa Pillepich, et al.. Supermassive black holes in cosmological simulations I: M_BH-M_star relation and black hole mass function. 2021. ⟨hal-03102302⟩
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