astro-ph/0010468

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IN THE BEGINNING: THE FIRST SOURCES OF LIGHT AND THE REIONIZATION OF THE UNIVERSE

Rennan Barkana 1


Institute for Advanced Study, Olden Lane, Princeton, NJ 08540

Abraham Loeb


Department of Astronomy, Harvard University, 60 Garden St., Cambridge, MA 02138

Abstract. The formation of the first stars and quasars marks the transformation of the universe from its smooth initial state to its clumpy current state. In popular cosmological models, the first sources of light began to form at a redshift z = 30 and reionized most of the hydrogen in the universe by z = 7. Current observations are at the threshold of probing the hydrogen reionization epoch. The study of high-redshift sources is likely to attract major attention in observational and theoretical cosmology over the next decade.

Table of Contents

PREFACE: THE FRONTIER OF SMALL-SCALE STRUCTURE

HIERARCHICAL FORMATION OF COLD DARK MATTER HALOS
The Expanding Universe
Linear Gravitational Growth
Formation of Nonlinear Objects
The Abundance of Dark Matter Halos

GAS INFALL AND COOLING IN DARK MATTER HALOS
Cosmological Jeans Mass
Response of Baryons to Nonlinear Dark Matter Potentials
Molecular Chemistry, Photo-Dissociation, and Cooling

FRAGMENTATION OF THE FIRST GASEOUS OBJECTS
Star Formation
Fragmentation into Stars
Emission Spectrum of Metal-Free Stars
Emission of Recombination Lines from the First Galaxies
Black Hole Formation

GALAXY PROPERTIES
Formation and Properties of Galactic Disks
Phenomenological Prescription for Star Formation

RADIATIVE FEEDBACK FROM THE FIRST SOURCES OF LIGHT
Escape of Ionizing Radiation from Galaxies
Propagation of Ionization Fronts in the IGM
Reionization of the IGM
Hydrogen Reionization
Helium Reionization
Photo-evaporation of Gaseous Halos After Reionization
Suppression of the Formation of Low Mass Galaxies

FEEDBACK FROM GALACTIC OUTFLOWS
Propagation of Supernova Outflows in the IGM
Effect of Outflows on Dwarf Galaxies and on the IGM

PROPERTIES OF THE EXPECTED SOURCE POPULATION
The Cosmic Star Formation History
Number Counts
Galaxies
Quasars
Supernovae
Gamma Ray Bursts
Distribution of Disk Sizes
Gravitational Lensing

OBSERVATIONAL PROBES OF THE EPOCH OF REIONIZATION
Spectral Methods of Inferring the Reionization Redshift
Cosmology with Lyalpha Photons
21 cm Tomography of the Reionization Epoch
Effect of Reionization on CMB Anisotropies
Remnants of High-Redshift Systems in the Local Universe

CHALLENGES FOR THE FUTURE

REFERENCES


1 Present address: Canadian Institute for Theoretical Astrophysics, 60 St. George Street #1201A, Toronto, Ontario, M5S 3H8, CANADA. Back.

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