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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• The haloes that reionized the Universe
• The CUBES Science Case
• Revealing the formation histories of the first stars with the cosmic near-infrared background
• Does the Reionization Model Influence the Constraints on Dark Matter Decay or Annihilation?
• Impact of the cosmological expansion on spectral energy density of radiation in the intergalactic medium and once more about Olbers' paradox
• An Overview of Mobile Capacitive Touch Technologies Trends
• Streaming Velocity Effects on the Post-reionization 21 cm Baryon Acoustic Oscillation Signal
• The Contribution of AGN Accretion Disks to Hydrogen Reionization
• Physics of star formation history and the luminosity function of galaxies therefrom
• 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
• A New Boundary Condition on Reionization
• Ultra-high energy cosmic rays with UFA-15 source model in Bumblebee gravity theory
• Neutrino anisotropy as a probe of extreme astrophysical accelerators
• Data-driven analysis for understanding ultrahigh energy cosmic ray source spectra
• Simulation based inference of the ionization history from the 2D 21 cm power spectrum
• CosmoUiT: A Vision Transformer-UNet Hybrid for Fast and Accurate Emulation of 21-cm Maps from the Epoch of Reionization
• It's Always Darkest Before the Cosmic Dawn: Early Results from Novel Tools and Telescopes for 21 cm Cosmology
• The JWST early galaxy crisis resolved by a reionization degeneracy
• Discovering Supernovae at Epoch of Reionization with Nancy Grace Roman Space Telescope
• Ultra high-energy cosmic rays from beyond the Greisen-Zatsepin-Kuz'min horizon
• Quantifying and mitigating the effect of snapshot interval in light-cone Epoch of Reionization 21-cm simulations