Evolution of Black Hole and Galaxy Growth in a Semi-numerical Galaxy Formation Model

We present a simple semi-numerical model designed to explore black hole growth and galaxy evolution. This method builds on a previous model for black hole accretion that uses a semi-numerical galaxy formation model and universal Eddington ratio distribution to describe the full active galactic nucle...

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Bibliographic Details
Published in:The Astrophysical journal 2019-08, Vol.881 (2), p.110
Main Authors: Jones, Mackenzie L., Hickox, Ryan C., Mutch, Simon J., Croton, Darren J., Ptak, Andrew F., DiPompeo, Michael A.
Format: Article
Language:English
Subjects:
Active galactic nuclei
Astrophysics
Black holes
Computer simulation
Dark matter
Deposition
Galactic evolution
Galactic halos
Galaxies
galaxies: active
galaxies: evolution
Galaxy distribution
Halos
Luminosity
Mathematical models
Numerical models
quasars: general
Red shift
Star & galaxy formation
Star formation
Stars & galaxies
Stellar evolution
X-rays: galaxies
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Summary:We present a simple semi-numerical model designed to explore black hole growth and galaxy evolution. This method builds on a previous model for black hole accretion that uses a semi-numerical galaxy formation model and universal Eddington ratio distribution to describe the full active galactic nucleus (AGN) population by independently connecting galaxy and AGN growth to the evolution of the host dark matter halos. We fit observed X-ray luminosity functions up to a redshift of z ∼ 4, as well as investigate the evolution of the Eddington ratio distributions. We find that the Eddington ratio distribution evolves with redshift such that the slope of the low-Eddington accretion rate distribution increases with cosmic time, consistent with the behavior predicted in hydrodynamical simulations for galaxies with different gas fractions. We also find that the evolution of our average Eddington ratio is correlated with observed star formation histories, supporting a picture in which black holes and galaxies evolve together in a global sense. We further confirm the impact of luminosity limits on observed galaxy and halo properties by applying selection criteria to our fiducial model and comparing to surveys across a wide range of redshifts.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab2d9f