# Fully Coupled Simulation of Cosmic Reionization. III. Stochastic Early Reionization by the Smallest Galaxies

@article{Norman2018FullyCS,
title={Fully Coupled Simulation of Cosmic Reionization. III. Stochastic Early Reionization by the Smallest Galaxies},
author={Michael L. Norman and Peng-fei Chen and John H. Wise and Haoting Xu},
journal={The Astrophysical Journal},
year={2018}
}
Previously we identified a new class of early galaxy that we estimate contributes up to 30% of the ionizing photons responsible for reionization. These are low-mass halos in the range = 106.5–108 that have been chemically enriched by supernova ejecta from prior Population III star formation. Despite their low star formation rates, these metal cooling halos (MCs) are significant sources of ionizing radiation, especially at the onset of reionization, owing to their high number density and… Expand

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#### References

SHOWING 1-10 OF 27 REFERENCES
Self-regulated reionization
• Physics
• 2006
Recently, we have presented the first, truly large-scale radiative transfer simulations of inhomogeneous cosmic reionization which resolve all the possible halo sources down to the dwarf galaxy massExpand
ESCAPE FRACTION OF IONIZING PHOTONS DURING REIONIZATION: EFFECTS DUE TO SUPERNOVA FEEDBACK AND RUNAWAY OB STARS
• Physics
• 2014
The fraction of hydrogen ionizing photons escaping from galaxies into the intergalactic medium is a critical ingredient in the theory of reionization. We use two zoomed-in, high-resolution (4 pc),Expand
FULLY COUPLED SIMULATION OF COSMIC REIONIZATION. II. RECOMBINATIONS, CLUMPING FACTORS, AND THE PHOTON BUDGET FOR REIONIZATION
• Physics
• 2014
We use a fully self-consistent cosmological simulation including dark matter dynamics, multispecies hydrodynamics, chemical ionization, flux limited diffusion radiation transport, and a parameterizedExpand
The Birth of a Galaxy: Primordial Metal Enrichment and Stellar Populations
• Physics
• 2012
By definition, Population III stars are metal-free, and their protostellar collapse is driven by molecular hydrogen cooling in the gas phase, leading to large characteristic masses. Population IIExpand
A suppressed contribution of low-mass galaxies to reionization due to supernova feedback
• Physics
• 2013
Motivated by recent observations of the star formation rate density function out to z ∼ 7, we describe a simple model for the star formation rate density function at high redshift based on theExpand
DETECTING THE RISE AND FALL OF THE FIRST STARS BY THEIR IMPACT ON COSMIC REIONIZATION
• Physics
• 2012
The intergalactic medium was reionized before redshift z ∼ 6, most likely by starlight which escaped from early galaxies. The very ﬁrst stars formed when hydrogen molecules (H2) cooled gas inside theExpand
The Fate of the First Galaxies. II. Effects of Radiative Feedback
• Physics
• 2002
We use three-dimensional cosmological simulations with radiative transfer to study the formation and evolution of the first galaxies in a ΛCDM cosmology. The simulations include continuum radiativeExpand
Late Pop III Star Formation During the Epoch of Reionization: Results from the Renaissance Simulations
• Physics
• 2016
We present results on the formation of Pop III stars at redshift 7.6 from the Renaissance Simulations, a suite of extremely high-resolution and physics-rich radiation transport hydrodynamicsExpand
GALAXY PROPERTIES AND UV ESCAPE FRACTIONS DURING THE EPOCH OF REIONIZATION: RESULTS FROM THE RENAISSANCE SIMULATIONS
• Physics
• 2016
D RAFT VERSION O CTOBER 11, 2016 Preprint typeset using L A TEX style emulateapj v. 01/23/15 GALAXY PROPERTIES AND UV ESCAPE FRACTIONS DURING EPOCH OF REIONIZATION: RESULTS FROM THE RENAISSANCEExpand
Can 21-cm observations discriminate between high-mass and low-mass galaxies as reionization sources?
The prospect of detecting the first galaxies by observing their impact on the intergalactic medium as they reionized it during the first billion years leads us to ask whether such indirectExpand