Reionization of the Intergalactic Medium

Abstract

After recombination the cosmic gas was left in a cold and neutral state. However, as the first stars and black holes formed within early galactic systems, their UV and X-ray radiation induced a gradual phase transition of the intergalactic gas into the warm and ionized state we currently observe. This process is known as cosmic reionization. Understanding how the energy deposition connected with galaxy and star formation shaped the properties of the intergalactic gas is one of the primary goals of present-day cosmology. In addition, reionization back reacts on galaxy evolution, determining many of the properties of the high-redshift galaxy population that represent the current frontier of our discovery of the cosmos. In these two Lectures we provide a pedagogical overview of cosmic reionization and intergalactic medium and of some of the open questions in these fields.

Review Lecture given at New Horizons for Observational Cosmology, International School of Physics Enrico Fermi, Varenna, July 1-6, 2013, eds. A. Melchiorri, A. Cooray, E. Komatsu, to be published by the Italian Society of Physics. arXiv admin note: substantial text overlap with arXiv:astro-ph/9806286, arXiv:0711.3358 by other authors

References in corpus (10)

• Statistics of 207 Lya Emitters at a Redshift Near 7: Constraints on Reionization and Galaxy Formation Models
• Signatures of X-rays in the early Universe
• Escape Fraction of Ionizing Radiation from Starburst Galaxies at High Redshifts
• Population III Stars and Remnants in High Redshift Galaxies
• HeII emitters in the VIMOS VLT Deep Survey: PopIII star formation or peculiar stellar populations in galaxies at 2<z<4.6?
• Joint QSO-CMB constraints on reionization history
• Data-constrained reionization and its effects on cosmological parameters
• Impact of general reionization scenarios on extraction of inflationary parameters
• Simulating intergalactic quasar scintillation
• Analytical Models of the Intergalactic Medium and Reionization

Cited by in corpus (4)

• First study of reionization in the Planck 2015 normalized closed $\Lambda$CDM inflation model
• First study of reionization in tilted flat and untilted non-flat dynamical dark energy inflation models
• Influence of ~7 keV sterile neutrino dark matter on the process of reionization
• A Multi-messenger view of Cosmic Dawn: Conquering the Final Frontier