Cosmic Reionization and the 21-cm signal: Comparison between an analytical model and a simulation

Abstract

We measure several properties of the reionization process and the corresponding low-frequency 21-cm signal associated with the neutral hydrogen distribution, using a large volume, high resolution simulation of cosmic reionization. The brightness temperature of the 21-cm signal is derived by post-processing this numerical simulation with a semi-analytical prescription. Our study extends to high redshifts (z ~ 25) where, in addition to collisional coupling, our post-processed simulations take into account the inhomogeneities in the heating of the neutral gas by X-rays and the effect of an inhomogeneous Lya radiation field. Unlike the well-studied case where spin temperature is assumed to be significantly greater than the temperature of the cosmic microwave background due to uniform heating of the gas by X-rays, spatial fluctuations in both the Lya radiation field and X-ray intensity impact predictions related to the brightness temperature at z > 10, during the early stages of reionization and gas heating. The statistics of the 21-cm signal from our simulation are then compared to existing analytical models in the literature and we find that these analytical models provide a reasonably accurate description of the 21-cm power spectrum at z < 10. Such an agreement is useful since analytical models are better suited to quickly explore the full astrophysical and cosmological parameter space relevant for future 21-cm surveys. We find, nevertheless, non-negligible differences that can be attributed to differences in the inhomogeneous X-ray heating and Lya coupling at z > 10 and, with upcoming interferometric data, these differences in return can provide a way to better understand the astrophysical processes during reionization.

Major paper revision to match version accepted for publication in ApJ. Simulation now fully includes fluctuations in the X-ray heating and the Lya radiation field. 18 pages, 13 figures

References in corpus (73)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Starburst99: Synthesis Models for Galaxies with Active Star Formation
• Halo Models of Large Scale Structure
• Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Constraining the Evolution of the Ionizing Background and the Epoch of Reionization with z ~ 6 Quasars II: A Sample of 19 Quasars
• In the Beginning: The First Sources of Light and the Reionization of the Universe
• A Survey of z>5.8 Quasars in the Sloan Digital Sky Survey I: Discovery of Three New Quasars and the Spatial Density of Luminous Quasars at z~6
• Evidence for Reionization at z ~ 6: Detection of a Gunn-Peterson Trough in a z=6.28 Quasar
• On the properties of massive Population III stars and metal-free stellar populations
• Observational constraints on Cosmic Reionization
• 21-cm Tomography of the Intergalactic Medium at High Redshift
• The Growth of HII Regions During Reionization
• The transition from Population III to normal galaxies: Ly-a and HeII 1640 emission and the ionising properties of high redshift starburst galaxies
• Cosmological Parameter Estimation Using 21 cm Radiation from the Epoch of Reionization
• Efficient Simulations of Early Structure Formation and Reionization
• 21 Centimeter Fluctuations from Cosmic Gas at High Redshifts
• Generic Spectrum and Ionization Efficiency of a Heavy Initial Mass Function for the First Stars
• Cosmological Reionization by Stellar Sources
• Simulating Cosmic Reionization at Large Scales I: the Geometry of Reionization
• The morphology of HII regions during reionization
• Measuring the Small-Scale Power Spectrum of Cosmic Density Fluctuations Through 21 cm Tomography Prior to the Epoch of Structure Formation
• Simulations and Analytic Calculations of Bubble Growth During Hydrogen Reionization
• Unusually Large Fluctuations in the Statistics of Galaxy Formation at High Redshift
• The Universe Was Reionized Twice
• Multifrequency analysis of 21 cm fluctuations from the Era of Reionization
• The Global 21 Centimeter Background from High Redshifts
• How accurately can 21 cm tomography constrain cosmology?
• Detecting the Earliest Galaxies Through Two New Sources of 21cm Fluctuations
• 21 cm fluctuations from inhomogeneous X-ray heating before reionization
• Wouthuysen-Field coupling strength and application to high-redshift 21 cm radiation
• Reionization of Hydrogen and Helium by Early Stars and Quasars
• The Spin-Kinetic Temperature Coupling and the Heating Rate due to Lyman Alpha Scattering before Reionization: Predictions for 21cm Emission and Absorption
• Toward Epoch of Reionization Measurements with Wide-Field Radio Observations
• Radiative transfer simulations of cosmic reionization I: methodology and initial results
• The Reionization History at High Redshifts I: Physical Models and New Constraints from CMB Polarization
• Early Reionization by the First Galaxies
• Taxing the Rich: Recombinations and Bubble Growth During Reionization
• Simulating Cosmic Reionization at Large Scales II: the 21-cm Emission Features and Statistical Signals
• Statistical Probes of Reionization With 21 cm Tomography
• Polarization of the Microwave Background in Reionized Models
• The Impact of Inhomogeneous Reionization on Cosmic Microwave Background Anisotropy
• On using visibility correlations to probe the HI distribution from the dark ages to the present epoch I: Formalism and the expected signal
• Cosmic Reionisation by Stellar Sources: Population II Stars
• The 21cm angular-power spectrum from the dark ages
• A Limit from the X-ray Background on the Contribution of Quasars to Reionization
• The Kinetic Sunyaev-Zel'dovich Effect from Reionization
• Probing the Reionization History of the Universe using the Cosmic Microwave Background Polarization
• Small-scale CMB Temperature and Polarization Anisotropies due to Patchy Reionization
• The spin temperature and 21cm brightness of the intergalactic medium in the pre-reionization era
• Characteristic Scales During Reionization
• Redshifted 21 cm Emission From the Pre-Reionization Era I. Mean Signal and Linear Fluctuations
• Cosmological Hydrogen Reionization with Three Dimensional Radiative Transfer
• Observing the Reionization Epoch Through 21 Centimeter Radiation
• Model-independent constraints on reionization from large-scale CMB polarization
• The Reionization History at High Redshifts II: Estimating the Optical Depth to Thomson Scattering from CMB Polarization
• The Scattering of Lyman-series Photons in the Intergalactic Medium
• Lyman-alpha radiative transfer during the Epoch of Reionization: contribution to 21-cm signal fluctuations
• Evolution of the Ionizing Radiation Background and Star Formation in the Aftermath of Cosmological Reionization
• Higher Order Contributions to the 21 cm Power Spectrum
• Spin Exchange Rates in Electron-Hydrogen Collisions
• Cosmological HII Bubble Growth During Reionization
• Have We Detected Patchy Reionization in Quasar Spectra?
• Large-Scale Simulations of Reionization
• HI Signal from Reionization Epoch
• Sunyaev-Zeldovich Fluctuations from the First Stars?
• Heating and cooling of the intergalactic medium by resonance photons
• Cosmological and Astrophysical Parameter Measurements with 21-cm Anisotropies During the Era of Reionization
• Cross-Correlation Studies between CMB Temperature Anisotropies and 21 cm Fluctuations
• The spin temperature of neutral hydrogen during cosmic pre-reionization
• The Spin-Resolved Atomic Velocity Distribution and 21-cm Line Profile of Dark-Age Gas
• On Correlated Random Walks and 21-cm Fluctuations During Cosmic Reionization

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