Physics of the Intergalactic Medium During the Epoch of Reionization

  title={Physics of the Intergalactic Medium During the Epoch of Reionization},
  author={Adam Lidz},
  journal={arXiv: Cosmology and Nongalactic Astrophysics},
  • A. Lidz
  • Published 4 November 2015
  • Physics
  • arXiv: Cosmology and Nongalactic Astrophysics
A major goal of observational and theoretical cosmology is to observe the largely unexplored time period in the history of our universe when the first galaxies form, and to interpret these measurements. Early galaxies dramatically impacted the gas around them in the surrounding intergalactic medium (IGM) by photoionzing the gas during the “Epoch of Reionization” (EoR). This epoch likely spanned an extended stretch in cosmic time: ionized regions formed and grew around early generations of… 
A multi-messenger view of cosmic dawn: Conquering the final frontier
The epoch of Cosmic Dawn, when the first stars and galaxies were born, is widely considered as the final frontier of observational cosmology today. Mapping the period between Cosmic Dawn and the
Cosmic Reionization After Planck and Before JWST: An Analytic Approach
The reionization of cosmic hydrogen marks a critical juncture in the history of structure formation in the universe. Here we present a new formulation of the standard reionization equation for the
Radiation Backgrounds at Cosmic Dawn: X-Rays from Compact Binaries
We compute the expected X-ray diffuse background and radiative feedback on the intergalactic medium (IGM) from X-ray binaries prior and during the epoch of reionization. The cosmic evolution of
First study of reionization in tilted flat and untilted non-flat dynamical dark energy inflation models
We examine the effects of dark energy dynamics and spatial curvature on cosmic reionization by studying reionization in tilted spatially flat and untilted non-flat XCDM and ϕCDM dynamical dark
CMB signatures of metal-free star formation and Planck 2015 polarization data
Standard analyses of the reionization history of the universe from Planck cosmic microwave background (CMB) polarization measurements consider only the overall optical depth to electron scattering
First study of reionization in the Planck 2015 normalized closed ΛCDM inflation model
We study reionization in two non-flat $\Lambda$CDM inflation models that best fit the Planck 2015 cosmic microwave background anisotropy observations, ignoring or in conjunction with baryon acoustic
The Aurora radiation-hydrodynamical simulations of reionization: calibration and first results.
Swiss National Supercomputing Centre (CSCS) [s613]; Netherlands Organization for Scientific Research (NWO); European Research Council under the European Union's Seventh Framework Programme (FP7)/ERC


Radiative Transfer in a Clumpy Universe. III. The Nature of Cosmological Ionizing Sources
The history of the transition from a neutral intergalactic medium (IGM) to one that is almost fully ionized can reveal the character of cosmological ionizing sources. We study the evolution of the
During the period of reionization, the universe was filled with a cosmological background of ionizing radiation. By that time a significant fraction of the cosmic gas had already been incorporated
Early in the reionization process, the intergalactic medium (IGM) would have been quite inhomogeneous on small scales, due to the low Jeans mass in the neutral IGM and the hierarchical growth of
Reionization of the Inhomogeneous Universe
A model of the density distribution in the intergalactic medium (IGM), motivated by that found in numerical simulations, is used to demonstrate the effect of a clumpy IGM and discrete sources on the
Signatures of Stellar Reionization of the Universe
The high ionization level and nonzero metallicity (~1% Z☉) of the intergalactic gas at redshifts z 5 implies that nonlinear structure had started to form in the universe at earlier times than we
Computer Simulations of Cosmic Reionization
The cosmic reionization of hydrogen was the last major phase transition in the evolution of the universe, which drastically changed the ionization and thermal conditions in the cosmic gas. To the
The Growth of H II Regions During Reionization
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
The global 21-centimeter background from high redshifts
We consider the evolution of the sky-averaged 21-cm background during the early phases of structure formation. Using simple analytic models, we calculate the thermal and ionization histories,
Constraints on reionization from the thermal history of the intergalactic medium
The temperature of the diffuse, photoheated intergalactic medium (IGM) depends on its reionization history because the thermal timescales are long. The widths of the hydrogen Lyα absorption lines
We show that various milestones of high-redshift galaxy formation, such as the formation of the first stars or the complete reionization of the intergalactic medium, occurred at different times in