Astraeus VI: Hierarchical assembly of AGN and their large-scale effect during the Epoch of Reionization

Abstract

In this work, the sixth of a series, we use the ASTRAEUS (semi-numerical rAdiative tranSfer coupling of galaxy formaTion and Reionization in N-body dark matter simUlationS) framework to investigate the nature of the sources that reionized the Universe. We extend ASTRAEUS, which already couples a galaxy formation semi-analytical model with a detailed semi-numerical reionization scheme, to include a model for black hole formation, growth, and the production of ionizing radiation from associated AGN (active galactic nuclei). We calibrate our fiducial AGN model to reproduce the bolometric luminosity function at z ~ 5, and explore the role of the resulting AGN population in reionizing the Universe. We find that in all the models yielding a reasonable AGN luminosity function, galaxies dominate overwhelmingly the ionizing budget during the Epoch of Reionization, with AGN accounting for 1-10% of the ionizing budget at z=6 and starting to play a role only below z < 5.

15+2 pages, 14+1 figures, 1 table. Accepted in MNRAS

References in corpus (44)

• Array Programming with NumPy
• A luminous quasar at a redshift of z = 7.085
• Binary Population and Spectral Synthesis Version 2.1: construction, observational verification and new results
• Cosmic Reionization and Early Star-Forming Galaxies: A Joint Analysis of New Constraints from Planck and Hubble Space Telescope
• Formation of Supermassive Black Holes by Direct Collapse in Pregalactic Halos
• Observational constraints on Cosmic Reionization
• Supermassive black hole formation during the assembly of pre-galactic discs
• A Luminous Quasar at Redshift 7.642
• Evidence of patchy hydrogen reionization from an extreme Ly$\alpha$ trough below redshift six
• Escape fraction of ionizing photons during reionization: effects due to supernova feedback and runaway OB stars
• Pōniuā'ena: A Luminous $z=7.5$ Quasar Hosting a 1.5 Billion Solar Mass Black Hole
• Conditions for Reionizing the Universe with A Low Galaxy Ionizing Photon Escape Fraction
• Faint AGNs at z>4 in the CANDELS GOODS-S field: looking for contributors to the reionization of the Universe
• Hydrogen reionisation ends by $z=5.3$: Lyman-$\alpha$ optical depth measured by the XQR-30 sample
• The dark nemesis of galaxy formation: why hot haloes trigger black hole growth and bring star formation to an end
• Line Emitting Galaxies Beyond a Redshift of 7: An Improved Method for Estimating the Evolving Neutrality of the Intergalactic Medium
• New observations of z~7 galaxies: evidence for a patchy reionization
• Fluctuations in the High-Redshift Lyman-Werner Background: Close Halo Pairs as the Origin of Supermassive Black Holes
• Formation of massive black holes in rapidly growing pre-galactic gas clouds
• Rapid Decline of Lyman-alpha Emission Toward the Reionization Era
• High-redshift AGN in the Chandra Deep Fields: the obscured fraction and space density of the sub-$L_{\ast }$ population
• Feedback-regulated Super Massive Black Hole Seed Formation
• Essential physics of early galaxy formation
• Black hole mergers from dwarf to massive galaxies with the NewHorizon and Horizon-AGN simulations
• Relative Role of Stars and Quasars in Cosmic Reionization
• The systematic search for $z\gtrsim 5$ active galactic nuclei in the $Chandra$ Deep Field South
• (Re)Solving Reionization with Lyα: How Bright Lyα Emitters account for the $z\approx 2-8$ Cosmic Ionizing Background
• Light, medium-weight or heavy? The nature of the first supermassive black hole seeds
• The X-ray emission of z>2.5 active galactic nuclei can be obscured by their host galaxies
• Forming massive seed black holes in high-redshift quasar host progenitors
• Black hole mass estimation for Active Galactic Nuclei from a new angle
• A physically-based model of the ionizing radiation from active galaxies for photoionization modeling
• Cosmic Reionization After Planck and Before JWST: An Analytic Approach
• Semi-analytic forecasts for JWST -- V. AGN luminosity functions and helium reionization at z = 2-7
• Large scale simulations of H and He reionization and heating driven by stars and more energetic sources
• Lyman-alpha opacities at z=4-6 require low mass, radiatively-suppressed galaxies to drive cosmic reionization
• Black hole obscuration and duty cycles mediated by AGN feedback in high redshift galaxies
• How AGN and SNe feedback affect mass transport and black hole growth in high redshift galaxies
• The mass assembly of high-redshift black holes
• The space density of ultra-luminous QSOs at the end of reionization epoch by the QUBRICS Survey and the AGN contribution to the hydrogen ionizing background
• Distribution of the very first PopIII stars and their relation to bright z~6 quasars
• Modelling a bright z = 6 galaxy at the faint end of the AGN luminosity function
• The Luminosity Function of bright QSOs at z~4 and implications for the cosmic ionizing background
• AstraeusIV : Quantifying the star formation histories of galaxies in the Epoch of Reionization

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• The Ly$\alpha$ and Continuum Origins Survey. III. Investigating the Link between Galaxy Morphology, Merger Properties and LyC Escape