Cosmic Reionization and Early Star-Forming Galaxies: A Joint Analysis of New Constraints from Planck and Hubble Space Telescope

Abstract

We discuss new constraints on the epoch of cosmic reionization and test the assumption that most of the ionizing photons responsible arose from high redshift star-forming galaxies. Good progress has been made in charting the end of reionization through spectroscopic studies of z~6-8 QSOs, gamma-ray bursts and galaxies expected to host Lyman-alpha emission. However, the most stringent constraints on its duration have come from the integrated optical depth, tau, of Thomson scattering to the cosmic microwave background. Using the latest data on the abundance and luminosity distribution of distant galaxies from Hubble Space Telescope imaging, we simultaneously match the reduced value tau=0.066 +/- 0.012 recently reported by the Planck collaboration and the evolving neutrality of the intergalactic medium with a reionization history within 6 <~ z <~ 10, thereby reducing the requirement for a significant population of very high redshift (z>>10) galaxies. Our analysis strengthens the conclusion that star-forming galaxies dominated the reionization process and has important implications for upcoming 21cm experiments and searches for early galaxies with James Webb Space Telescope.

Version accepted by ApJL on Mar. 2, 2015

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• Relatively Fast and Reasonably Furious: Evidence for Increased Burstiness in Smaller Halos at Cosmic Dawn
• Lyman-$\alpha$ Emitting Galaxies (LAEs) at Cosmic Dawn: Implications and Predictions
• Near-IR narrow-band imaging with CIRCE at the Gran Telescopio Canarias: Searching for Ly$\alpha$-emitters at $z\sim 9.3$
• Diversity of the Lyman continuum escape fractions of high-$z$ galaxies and its origins
• Ultrahigh energy cosmic rays and neutrino flux models
• Lyman-α polarization from cosmological ionization fronts: I. Radiative transfer simulations
• An Alcock-Paczynski Test on Reionization Bubbles for Cosmology
• Systematic search for lensed X-ray sources in the CLASH fields
• ECHO21: a tool for modelling global 21-cm signal from dark ages to reionization
• Mocking Faint Black Holes during Reionization
• A theoretical investigation of far-infrared fine structure lines at $z>6$ and of the origin of the [OIII]88/[CII]158 enhancement
• REBELS-IFU: Spatially Resolved Ionizing Photon Production Efficiencies of 12 Bright Galaxies in the Epoch of Reionization
• Revealing the formation histories of the first stars with the cosmic near-infrared background
• Double-Peaked Ly$\alpha$ Emission during Reionization Requires Nearby Voids and a Favorable Local Ionizing Background
• An Overview of Mobile Capacitive Touch Technologies Trends
• Power-law Emission-line Wings and Radiation-Driven Superwinds in Local Lyman Continuum Emitters
• A resolved Lyman-Alpha profile with doubly peaked emission at z~7
• The haloes that reionized the Universe
• On the Origins of "Hostless'' Supernovae: Testing the Faint-end Galaxy Luminosity Function and Supernova Progenitors with Events in Dwarf Galaxies
• The CUBES Science Case
• CCAT: A status update on the EoR-Spec instrument module for Prime-Cam
• J-PAS: First Identification, Physical Properties and Ionization Efficiency of Extreme Emission Line Galaxies
• Deep JWST spectroscopy of galaxies in a candidate ionized bubble at $z=8.7$: probing reionization at pMpc scales with Ly$\alpha$ emission
• Impact of the cosmological expansion on spectral energy density of radiation in the intergalactic medium and once more about Olbers' paradox
• The Physical Properties of Star-Forming Galaxies with Strong [O III] Lines at z=3.25
• Rise of the forsaken relics: connecting present-day stellar streams and phase-mixed galaxies to the Epoch of Reionization
• The Evolving Power Spectrum for the light cone Epoch of Reionization (EoR) 21-cm signal
• Does the Reionization Model Influence the Constraints on Dark Matter Decay or Annihilation?
• Tracing ionized gas kinematics in Lyman-Break Analogs. Implications for star formation compactness and outflow properties
• Ultra high-energy cosmic rays from beyond the Greisen-Zatsepin-Kuz'min horizon
• Discovering Supernovae at Epoch of Reionization with Nancy Grace Roman Space Telescope
• Ultra-high energy cosmic rays with UFA-15 source model in Bumblebee gravity theory
• The JWST early galaxy crisis resolved by a reionization degeneracy
• It's Always Darkest Before the Cosmic Dawn: Early Results from Novel Tools and Telescopes for 21 cm Cosmology
• Data-driven analysis for understanding ultrahigh energy cosmic ray source spectra
• CosmoUiT: A Vision Transformer-UNet Hybrid for Fast and Accurate Emulation of 21-cm Maps from the Epoch of Reionization
• Lyman Continuum escaping from in-situ formed stars in a tidal bridge at z = 3
• A quantitative assessment of completeness correction methods and public release of a versatile simulation code
• Physics of star formation history and the luminosity function of galaxies therefrom
• Quantifying and mitigating the effect of snapshot interval in light-cone Epoch of Reionization 21-cm simulations
• The Contribution of AGN Accretion Disks to Hydrogen Reionization
• Neutrino anisotropy as a probe of extreme astrophysical accelerators
• Space Project for Astrophysical and Cosmological Exploration (SPACE), an ESA stand-alone mission and a possible contribution to the Origins Space Telescope
• Streaming Velocity Effects on the Post-reionization 21 cm Baryon Acoustic Oscillation Signal
• A New Boundary Condition on Reionization
• Simulation based inference of the ionization history from the 2D 21 cm power spectrum