A Cosmic UV/X-ray Background Model Update

Abstract

We present an updated model of the cosmic ionizing background from the UV to the X-rays. Relative to our previous model (Faucher-Giguere et al. 2009), the new model provides a better match to a large number of up-to-date empirical constraints, including: 1) new galaxy and AGN luminosity functions; 2) stellar spectra including binary stars; 3) obscured and unobscured AGN; 4) a measurement of the non-ionizing UV background; 5) measurements of the intergalactic HI and HeII photoionization rates at z~0-6; 6) the local X-ray background; and 7) improved measurements of the intergalactic opacity. In this model, AGN dominate the HI ionizing background at z<~3 and star-forming galaxies dominate it at higher redshifts. Combined with the steeply declining AGN luminosity function beyond z~2, the slow evolution of the HI ionization rate inferred from the high-redshift HI Lya forest requires an escape fraction from star-forming galaxies that increases with redshift (a population-averaged escape fraction of ~1% suffices to ionize the intergalactic medium at z=3 when including the contribution from AGN). We provide effective photoionization and photoheating rates calibrated to match the Planck 2018 reionization optical depth and recent constraints from the HeII Lya forest in hydrodynamic simulations.

22 pages, 14 figures, to appear in MNRAS. Substantially improved since original posting (including a new AGN luminosity function and spectral treatment, and an improved IGM opacity model). Electronic data available at http://galaxies.northwestern.edu/uvb

References in corpus (34)

• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• UV Luminosity Functions at redshifts z~4 to z~10: 10000 Galaxies from HST Legacy Fields
• An Observational Determination of the Bolometric Quasar Luminosity Function
• The effect of photo-ionization on the cooling rates of enriched, astrophysical plasmas
• Binary Population and Spectral Synthesis Version 2.1: construction, observational verification and new results
• The synthesis of the cosmic X-ray background in the Chandra and XMM-Newton era
• Cosmic Reionization and Early Star-Forming Galaxies: A Joint Analysis of New Constraints from Planck and Hubble Space Telescope
• A New Calculation of the Ionizing Background Spectrum and the Effects of HeII Reionization
• Toward the Standard Population Synthesis Model of the X-Ray Background: Evolution of X-Ray Luminosity and Absorption Functions of Active Galactic Nuclei Including Compton-Thick Populations
• 3D Lyman-alpha radiation transfer. I. Understanding Lyman-alpha line profile morphologies
• The morphology of HII regions during reionization
• The COS-Halos Survey: Metallicities in the Low-Redshift Circumgalactic Medium
• The first ultraviolet quasar stacked spectrum at z=2.4 from WFC3
• Nebular Emission Line Ratios in z~2-3 Star-Forming Galaxies with KBSS-MOSFIRE: Exploring the Impact of Ionization, Excitation, and Nitrogen-to-Oxygen Ratio
• HeII Reionization and its Effect on the IGM
• The COS-Dwarfs Survey: The Carbon Reservoir Around sub-L* Galaxies
• Evolution of the Intergalactic Opacity: Implications for the Ionizing Background, Cosmic Star Formation, and Quasar Activity
• The MOSDEF Survey: Excitation Properties of $z\sim 2.3$ Star-forming Galaxies
• Cosmic X-ray background and Earth albedo Spectra with Swift/BAT
• INTEGRAL observations of the cosmic X-ray background in the 5-100 keV range via occultation by the Earth
• Mean Spectral Energy Distributions and Bolometric Corrections for Luminous Quasars
• Seyfert galaxies in the local Universe (z$\le$ 0.1): the average X-ray spectrum as seen by $BeppoSAX$
• Star formation histories of dwarf galaxies in the FIRE simulations: dependence on mass and Local Group environment
• Self-Consistent Modeling of Reionization in Cosmological Hydrodynamical Simulations
• The Photon Underproduction Crisis
• The Chandra COSMOS legacy survey: Energy Spectrum of the Cosmic X-ray Background and constraints on undetected populations
• A Flat Photoionization Rate at 2<z<4.2: Evidence for a Stellar-Dominated UV Background and Against a Decline of Cosmic Star Formation Beyond z~3
• Model-independent constraints on the hydrogen-ionizing emissivity at z>6
• Quantifying Distributions of Lyman Continuum Escape Fraction
• A measurement of the z = 0 UV background from H$\alpha$ fluorescence
• The Effect Of AGN Heating On The Low-Redshift Lyα Forest
• Lyman Continuum Escape Fraction in Ly$\alpha$ Emitters at $z\simeq 3.1$
• Gauging Metallicity of Diffuse Gas Under An Uncertain Ionizing Radiation Field
• Clumping factors of HII, HeII and HeIII

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