Quasar clustering in a galaxy and quasar formation model based on ultra high-resolution N-body simulations

Abstract

We investigate clustering properties of quasars using a new version of our semi-analytic model of galaxy and quasar formation with state-of-the-art cosmological N-body simulations. In this study, we assume that a major merger of galaxies triggers cold gas accretion on to a supermassive black hole and quasar activity. Our model can reproduce the downsizing trend of the evolution of quasars. We find that the median mass of quasar host dark matter haloes increases with cosmic time by an order of magnitude from z=4 (a few 1e+11 Msun) to z=1 (a few 1e+12 Msun), and depends only weakly on the quasar luminosity. Deriving the quasar bias through the quasar--galaxy cross-correlation function in the model, we find that the quasar bias does not depend on the quasar luminosity, similar to observed trends. This result reflects the fact that quasars with a fixed luminosity have various Eddington ratios and thus have various host halo masses that primarily determine the quasar bias. We also show that the quasar bias increases with redshift, which is in qualitative agreement with observations. Our bias value is lower than the observed values at high redshifts, implying that we need some mechanisms that make quasars inactive in low-mass haloes and/or that make them more active in high-mass haloes.

6 pages, 3 figures, to appear in MNRAS Letters

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Cited by in corpus (14)

• Black Hole - Galaxy Scaling Relationships for Active Galactic Nuclei with Reverberation Masses
• Luminous Quasars Do Not Live in the Most Overdense Regions of Galaxies at z~4
• Clustering of quasars in a wide luminosity range at redshift 4 with Subaru Hyper Suprime-Cam wide field imaging
• The New Numerical Galaxy Catalog (${\nu }^2$GC): An Updated Semi-analytic Model of Galaxy and AGN with Large Cosmological N-body Simulation
• The New Numerical Galaxy Catalogue (ν^2 GC): Properties of Active Galactic Nuclei and Their Host Galaxies
• The Halo Occupation Distribution of Obscured Quasars: Revisiting the Unification Model
• Revisiting the Extreme Clustering of $z\approx 4$ Quasars with Large Volume Cosmological Simulations
• Semi-analytic modelling of AGNs: auto-correlation function and halo occupation
• Cosmological Simulation of Galaxy Groups and Clusters-I: Global Effect of Feedback from Active Galactic Nuclei
• Co-evolution of supermassive black holes with galaxies from semi-analytic model: stochastic gravitational wave background and black hole clustering
• Possible evolution of the circum-galactic medium around QSOs with QSO age and cosmic time revealed by Ly$\alpha$ halos
• The evolution of supermassive blackhole mass--bulge mass relation by a semi-analytic model, ${\nu }^2$GC
• Imprints of the super-Eddington accretion on the quasar clustering
• Measuring photo-ionization rate and mean free path of HeII ionizing photons at $2.5\le z\le 3.6$: Evidence for late and rapid HeII reionization Part-II