Comparing Simple Quasar Demographics Models

Abstract

This paper explores several simple model variations for the connections among quasars, galaxies, and dark matter halos for redshifts 1 < z < 6. A key component of these models is that we enforce a self-consistent black hole (BH) history by tracking both BH mass and BH growth rate at all redshifts. We connect objects across redshift with a simple constant-number-density procedure, and choose a fiducial model with a relationship between BH and galaxy growth rates that is linear and evolves in a simple way with redshift. Within this fiducial model, we find the quasar luminosity function (QLF) by calculating an "intrinsic" luminosity based on either the BH mass or BH growth rate, and then choosing a model of quasar variability with either a lognormal or truncated power-law distribution of instantaneous luminosities. This gives four model variations, which we fit to the observed QLF at each redshift. With the best-fit models in hand, we undertake a detailed comparison of the four fiducial models, and explore changes to our fiducial model of the BH-galaxy relationship. Each model variation can successfully fit the observed QLF, the shape of which is generally set by the "intrinsic" luminosity at the faint end and by the scatter due to variability at the bright end. We focus on accounting for the reasons that physically different models can make such similar predictions, and on identifying what observational data or physical arguments are most essential in breaking the degeneracies among models.

14 pages, 8 figures, 1 table

References in corpus (48)

• Galactic Stellar and Substellar Initial Mass Function
• Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies
• The Average Star Formation Histories of Galaxies in Dark Matter Halos from z=0-8
• Toward a halo mass function for precision cosmology: the limits of universality
• On the Black Hole Mass - Bulge Mass Relation
• Revisiting the Scaling Relations of Black Hole Masses and Host Galaxy Properties
• The Large Scale Bias of Dark Matter Halos: Numerical Calibration and Model Tests
• The SDSS Quasar Survey: Quasar Luminosity Function from Data Release Three
• What Drives the Growth of Black Holes?
• The Canada-France High-z Quasar Survey: nine new quasars and the luminosity function at redshift 6
• Self-Regulated Growth of Supermassive Black Holes in Galaxies as the Origin of the Optical and X-ray Luminosity Functions of Quasars
• Black hole variability and the star formation-AGN connection: Do all star-forming galaxies host an AGN?
• Feast and Famine: Regulation of Black Hole Growth in Low Redshift Galaxies
• PRIMUS: The dependence of AGN accretion on host stellar mass and color
• The Mean Star Formation Rate of X-ray selected Active Galaxies and its Evolution from z=2.5: Results from PEP-Herschel
• Feedback from Central Black Holes in Elliptical Galaxies: Two-dimensional Models Compared to One-dimensional Models
• Accreting SMBHs in the COSMOS field and the connection to their host galaxies
• The 2dF-SDSS LRG and QSO Survey: the QSO luminosity function at 0.4<z<2.6
• Quasar Clustering from SDSS DR5: Dependences on Physical Properties
• The hidden "AGN main sequence": Evidence for a universal black hole accretion to star formation rate ratio since z~2 producing a M_BH-M* relation
• The z=5 Quasar Luminosity Function from SDSS Stripe 82
• The evolution of faint AGN between z~1 and z~5 from the COMBO-17 survey
• The SDSS-III Baryon Oscillation Spectroscopic Survey: The Quasar Luminosity Function from Data Release Nine
• A correlation between star formation rate and average black hole accretion in star forming galaxies
• The evolution of AGN across cosmic time: what is downsizing?
• On the evolution of the black hole:spheroid mass ratio
• The quasar M_bh - M_host relation through Cosmic Time II - Evidence for evolution from z=3 to the present age
• Quasars Are Not Light-Bulbs: Testing Models of Quasar Lifetimes with the Observed Eddington Ratio Distribution
• Dark matter haloes determine the masses of supermassive black holes
• A Physical Model for the Luminosity Function of High-Redshift Quasars
• Simulations of supermassive black hole growth in high-redshift disk galaxies
• The halo masses and galaxy environments of hyperluminous QSOs at z~2.7 in the Keck Baryonic Structure Survey
• Evolution of the Quasar Luminosity Function Over 3 < z < 5 in the COSMOS Survey Field
• Cross-Correlation of SDSS DR7 Quasars and DR10 BOSS Galaxies: The Weak Luminosity Dependence of Quasar Clustering at z~0.5
• A Simple Model for Quasar Demographics
• Supermassive Black Hole Growth in Starburst Galaxies over Cosmic Time: Constraints from the Deepest Chandra Fields
• The Luminosity Dependence of Quasar Clustering
• Supermassive Black Holes in the Hierarchical Universe: A General Framework and Observational Tests
• A simple model to link the properties of quasars to the properties of dark matter halos out to high redshift
• Reasoning From Fossils: Learning From the Local Black Hole Population About the Evolution of Quasars
• The most luminous quasars do not live in the most massive dark matter haloes at any redshift
• The host galaxies and black-hole:galaxy mass ratios of luminous quasars at z~4
• PRIMUS: An observationally motivated model to connect the evolution of the AGN and galaxy populations out to z~1
• Probing the faint end of the quasar luminosity function at z ~ 4 in the COSMOS field
• Radiative Transfer and Radiative driving of Outflows in AGN and Starbursts
• Modeling the QSO luminosity and spatial clustering at low redshifts
• Lensed Quasar Hosts
• PRIMUS: The relationship between Star formation and AGN accretion

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• X-rays across the galaxy population - III. The incidence of AGN as a function of star formation rate
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• Broadband spectral energy distributions of SDSS-selected quasars and of their host galaxies: intense activity at the onset of AGN feedback
• Evidence for a mass-dependent AGN Eddington ratio distribution via the flat relationship between SFR and AGN luminosity
• Pure Density Evolution of the Ultraviolet Quasar Luminosity Function at $2\lesssim z\lesssim 6$
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• Stochastic Processes as the Origin of the Double-Power Law Shape of the Quasar Luminosity Function
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