The physics of Reionization: processes relevant for SKA observations

TL;DR

This paper reviews the physics of the Epoch of Reionization, emphasizing the processes affecting the 21 cm signal for SKA observations, including ionizing photon production, escape, and absorption in the IGM.

Contribution

It provides a comprehensive overview of reionization physics and recent advances in understanding ionizing photon sources and IGM absorption relevant for SKA data interpretation.

Findings

Enhanced understanding of ionizing photon escape mechanisms.

Insights into absorption effects in minihalos and Lyman Limit Systems.

Implications for interpreting 21 cm signals during reionization.

Abstract

The local intensity of the 21 cm signal emitted during the Epoch of Reionization that will be mapped by the SKA is modulated by the amount of neutral hydrogen. Consequently, understanding the process of reionization of the intergalactic medium (IGM) is crucial for predicting and interpreting the upcoming observations. After presenting the basic physics and most meaningful quantities pertaining to the process of reionization, we will review recent progress in our understanding of the production and escape of ionizing photons in primordial galaxies and of their absorption in the IGM especially in so-called minihalos and Lyman Limit Systems.