The Growth of HII Regions During Reionization

Abstract

Recently, there has been a great deal of interest in understanding the reionization of hydrogen in the intergalactic medium (IGM). One of the major outstanding questions is how this event proceeds on large scales. Motivated by numerical simulations, we develop a model for the growth of HII regions during the reionization era. We associate ionized regions with large-scale density fluctuations and use the excursion set formalism to model the resulting size distribution. We then consider ways in which to characterize the morphology of ionized regions. We show how to construct the power spectrum of fluctuations in the neutral hydrogen field. The power spectrum contains definite features from the HII regions that should be observable with the next generation of low-frequency radio telescopes through surveys of redshifted 21 cm emission from the reionization era. Finally, we also consider statistical descriptions beyond the power spectrum and show that our model of reionization qualitatively changes the distribution of neutral gas in the IGM.

14 pages, 13 figures, submitted to ApJ

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• The large-scale 21-cm power spectrum from reionization
• Using the Long Wavelength Array to Search for Cosmic Dawn
• Impact of dark matter models on the EoR 21-cm signal bispectrum
• Constraining coupled quintessence with the 21cm signal
• Constraining the Epoch of Reionization With Highly Dispersed Fast Radio Bursts
• Identifying Ionized Regions in Noisy Redshifted 21 cm Data Sets
• Cross-correlation studies as a probe of reionization physics
• A Model-Insensitive Baryon Acoustic Oscillation Feature in the 21 cm Signal from Reionization
• Revised estimates of CMB $B$-mode polarization induced by patchy reionization
• Polarization Signals of the 21 cm Background from the Era of Reionization
• Bubble mapping with the Square Kilometer Array -- I. Detecting galaxies with Euclid, JWST, WFIRST and ELT within ionized bubbles in the intergalactic medium at z>6
• Variations in fundamental constants at the cosmic dawn
• Influence of ~7 keV sterile neutrino dark matter on the process of reionization
• Astraeus III: The environment and physical properties of reionization sources
• Deep-Learning Study of the 21cm Differential Brightness Temperature During the Epoch of Reionization
• Detecting the non-Gaussianity of the 21-cm signal during reionisation with the Wavelet Scattering Transform
• Cosmologically probing ultra-light particle dark matter using 21 cm signals
• Probing early universe through redshifted 21-cm signal: Modelling and observational challenges
• Constraints on the Abundance of Highly Ionized Proto-Cluster Regions from the Absence of Large Voids in the Lyman Alpha Forest
• Evidence for a low Lyman Continuum Escape fraction in three Massive, UV-bright galaxies at z > 7
• Quantifying Density-Ionization Correlations with the 21cm Power Spectrum
• Detectability of the 21 cm-CMB cross-correlation from the EoR
• Statistics of 21-cm Fluctuations in Cosmic Reionization Simulations: PDFs and Difference PDFs
• Modeling Reionization in a Bursty Universe
• The Impact of Realistic Foreground and Instrument Models on 21cm Epoch of Reionization Experiments
• Detectability of 21cm-signal during the Epoch of Reionization with 21cm-Lyman-α emitter cross-correlation. II. Foreground contamination
• An analytical model of the large neutral regions during the late stage of reionization
• Generating extremely large-volume reionisation simulations
• The impact and response of minihalos and the inter-halo medium on cosmic reionization
• The First Billion Years in Seconds: An Effective Model for the 21-cm Signal with Population III Stars
• Two-dimensional Topology of Cosmological Reionization
• Cosmic Reionization On Computers. Mean and Fluctuating Redshifted 21 cm Signal
• Is patchy reionization an obstacle in detecting the primordial gravitational wave signal?
• Source Mergers and Bubble Growth During Reionization
• A galaxy-free phenomenological model for the 21-cm power spectrum during reionization
• SCORCH. III. Analytical Models of Reionization with Varying Clumping Factors
• Constraining primordial non-Gaussianity with CMB-21cm cross-correlations?
• Probing the primordial Universe with 21-cm line from cosmic dawn/epoch of reionization
• CII and HI 21-cm line intensity mapping from the EoR: Impact of the light-cone effect on auto and cross-power spectra
• Inference of gravitational lensing and patchy reionization with future CMB data
• Suppressing variance in 21-cm signal simulations during reionization
• Probing delayed-end reionization histories with the 21cm-LAE cross-power spectrum
• The HI Bias during the Epoch of Reionization
• An Analytic Formulation of 21-cm Signal from Early Phase of Epoch of Reionization
• Enhanced Detectability of Pre-reionization 21-cm Structure
• Semi-numeric simulations of helium reionization and the fluctuating radiation background
• PINION: Physics-informed neural network for accelerating radiative transfer simulations for cosmic reionization
• A new probe of magnetic fields in the pre-reionization epoch: II. Detectability
• Premature Black Hole Death of Population III Stars by Dark Matter
• Cosmic mysteries and the hydrogen 21-cm line: bridging the gap with lunar observations
• Testing the scale-dependent hemispherical asymmetry with the 21-cm power spectrum from the epoch of reionization
• Extending Semi-numeric Reionisation Models to the First Stars and Galaxies
• Estimation of HII Bubble Size Distribution from 21cm Power Spectrum with Artificial Neural Networks
• Distinguishing reionization models using the largest cluster statistics of the 21-cm maps
• The Ultramarine Simulation: properties of dark matter haloes before redshift 5.5
• Thermal and Reionisation History within a Large-Volume Semi-Analytic Galaxy Formation Simulation
• Efficient exploration of reionization parameters for the upcoming 21 cm observations using a photon conserving semi-numerical model SCRIPT
• The inhomogenous reionization of the inter-galactic medium by metal-poor globular clusters
• Probing the intergalactic medium during the Epoch of Reionization using 21-cm signal power spectra
• The EDGES measurement disfavors an excess radio background during the cosmic dawn
• Estimating the Feasibility of 21cm-Ly$\alpha$ Synergies using the Hydrogen Epoch of Reionization Array
• Efficient simulation of discrete galaxy populations and associated radiation fields during the first billion years
• Antisymmetric Cross-correlation between H I and CO Line Intensity Maps as a New Probe of Cosmic Reionization
• A Framework for Simultaneously Measuring Field Densities and the High-z Luminosity Function
• 21 cm power spectrum in interacting cubic Galileon model
• Cosmic Reionization and the First Nonlinear Structures in the Universe
• Constraining Reionization with Lyman Alpha Emitting Galaxies
• Using the sample variance of 21cm maps as a tracer of the ionisation topology
• Detecting galaxy-21-cm cross-correlation during reionization
• Growth and anisotropy of ionization fronts near high redshift quasars in the MassiveBlack simulation
• Semi-Numerical Simulation of Reionization with Semi-Analytical Modeling of Galaxy Formation
• Reionization: Characteristic Scales, Topology and Observability
• On improving analytical models of cosmic reionization for matching numerical simulation
• Modeling the Intergalactic Medium during the Epoch of Reionization
• Modelling the 21 cm Signal From the Epoch of Reionization and Cosmic Dawn
• Lyman Alpha Emitters and the 21cm Power Spectrum as Probes of Density-Ionization Correlation in the Epoch of Reionization
• Probing Ultra-light Axion Dark Matter from 21cm Tomography using Convolutional Neural Networks
• Let there be Light: the Emergence of Structure out of the Dark Ages in the Early Universe
• Impact of the Epoch of Reionization sources on the 21-cm bispectrum
• Detecting Electron Density Fluctuations from Cosmic Microwave Background Polarization using a Bispectrum Approach
• Cosmic reionization in a dynamic quintessence cosmology
• Interpreting the HI 21-cm cosmology maps through Largest Cluster Statistics -- I: Impact of the synthetic SKA1-Low observations
• Impact of astrophysical scatter on the Epoch of Reionization [H I]${}_{21cm}$ bispectrum
• Calibrating excursion set reionization models to approximately conserve ionizing photons
• Studying neutral hydrogen structures during the epoch of reionization using fractal dimensions
• Local reionizations histories with merger tree of HII regions
• A hybrid multi resolution scheme to efficiently model the structure of reionization on the largest scales
• ScamPy -- A sub-halo clustering & abundance matching based Python interface for painting galaxies on the dark matter halo/sub-halo hierarchy
• Analytic Formulation of 21 cm Signal from Cosmic Dawn: Ly$\alpha$ Fluctuations
• ARC: Adaptive Ray-tracing with CUDA, a New Ray Tracing Code for Parallel GPUs
• Reionization and Cosmic Dawn: theory and simulations
• Energy injection in pre-recombination era and EDGES detection
• Constraining cosmic reionization by combining the kinetic Sunyaev-Zel'dovich and the 21 cm power spectra
• Ionized bubble number count as a probe of non-Gaussianity
• Deep learning approach for identification of HII regions during reionization in 21-cm observations -- III. image recovery
• First Light and Reionization: A Conference Summary
• Signature of the interaction between dark sectors in the reionization process
• The Impact of ionization Morphology and X-ray Heating on the Cosmological 21cm Skew Spectrum
• Probing the Epoch of Reionization using synergies of line intensity mapping
• Effects of chemically homogeneous evolution of the first stars on the 21-cm signal and reionization
• Linear Polarization of the 21 cm Line from the Epoch of Reionization
• Influence of synchrotron self-absorption on the 21cm experiments
• The Linear Perturbation Theory of Reionization in Position-Space: Cosmological Radiative Transfer Along the Light-Cone
• Signatures of reionization feedback in the near-infrared background
• Impact of the turnover in the high-z galaxy luminosity function on the 21-cm signal during Cosmic Dawn and Epoch of Reionization
• Field-level Reconstruction from Foreground-Contaminated 21-cm Maps
• Evolution of dwarf galaxy observable parameters
• An Improved Treatment of Cosmological Intergalactic Medium Evolution
• Dark matter model favoured by reionization data: 7 keV sterile neutrino vs cold dark matter
• Reconstructing patchy helium reionization using the cosmic microwave background and large-scale structure
• The variance of dispersion measure of high-redshift transient objects as a probe of ionized bubble size during reionization
• Effects of Small-Scale Absorption Systems on Neutral Islands during the Late Epoch of Reionization
• Reionisation time fields reconstruction from 21 cm signal maps
• Reionizing islands with inhomogeneous recombinations
• Impact of Calibration and Position Errors on Astrophysical Parameters of the HI 21cm Signal
• Fisher matrix forecasts on the astrophysics of galaxies during the epoch of reionisation from the 21-cm power spectra
• Reionization Parameter Inference from 3D Minkowski Functionals of the 21 cm Signals
• Narrowing the discovery space of the cosmological 21-cm signal using multi-wavelength constraints
• Spatial Correlation of Massive Black Hole Mergers: Probing the Formation Mechanism and Reionization
• Ly$\alpha$ Emission from [OIII] Emitters Near Reionization: The role of environment in galaxy Ly$\alpha$ detection
• Luminosity Bias (II): The Cosmic Web of the First Stars
• 21 cm Signal from the Thermal Evolution of Lyman-$\alpha$ during Cosmic Dawn
• An Alcock-Paczynski Test on Reionization Bubbles for Cosmology
• The THESAN project: environmental drivers of Local Group reionization
• Emergence of the Temperature-Density Relation in the Low-Density Intergalactic Medium
• The Infancy of Cosmic Reionization
• From ANN to BNN: Inferring Reionization Parameters using Uncertainty-aware Emulators of 21-cm Summaries
• oLIMpus: An Effective Model for Line Intensity Mapping Auto- and Cross- Power Spectra in Cosmic Dawn and Reionization
• Accelerating HI density predictions during the Epoch of Reionization using a GPR-based emulator on N-body simulations
• How far have metals reached? Reconciling statistical constraints and enrichment models at reionization
• Radiative transfer of 21-cm line through ionised cavities in an expanding universe
• An emulator for the ionizing photon mean free path in ultra-high resolution simulations: the implications of mean free path measurements for the reionization history
• Double-Peaked Ly$\alpha$ Emission during Reionization Requires Nearby Voids and a Favorable Local Ionizing Background
• O-V-S-Z and friends: Non-Gaussianity from inhomogeneous reionization
• Modified Cosmology or Modified Galaxy Astrophysics is Driving the z>6 JWST Results? CMB Experiments can discover the Origin in the Near Future
• The Effect of Large Optical Depths on the Non-Gaussian 21-cm signal from Cosmic Dawn
• The Neutral Islands during the Late Epoch of Reionization
• 21-cm power spectrum and ionization bias as a probe of long-mode modulated non Gaussian sky
• Probing power spectrum enhancement at small scales with the SKA
• Probing Cosmological Reionization through Radio-interferometric Observations of Neutral Hydrogen
• A bubble size distribution model for the Epoch of Reionization
• A New Boundary Condition on Reionization
• Power spectrum multipoles and clustering wedges during the Epoch of Reionization
• CosmoUiT: A Vision Transformer-UNet Hybrid for Fast and Accurate Emulation of 21-cm Maps from the Epoch of Reionization
• Contribution of Cross-Correlations to the 21cm Angular Power Spectrum in the Epoch of Reionization
• Exploring the Model Dependence of MCMC-Based 21 cm Power Spectrum Parameter Constraints
• Challenges of Relativistic Astrophysics
• Quantifying and mitigating the effect of snapshot interval in light-cone Epoch of Reionization 21-cm simulations