Formation of the First Galaxies: Theory and Simulations

TL;DR

This paper reviews the theory and cosmological simulations of the formation of the first galaxies, emphasizing the roles of early stars, supernovae, and heavy elements in shaping their properties and the prospects for their future detection.

Contribution

It provides a comprehensive survey of the theoretical understanding and simulation results regarding the formation and evolution of the first galaxies, highlighting key processes and observational prospects.

Findings

Primordial gas evolution influenced by early stellar radiation.

Heavy elements from supernovae alter galaxy evolution.

Future missions may detect primordial star-forming galaxies.

Abstract

The properties of the first galaxies are shaped in large part by the first generations of stars, which emit high energy radiation and unleash both large amounts of mechanical energy and the first heavy elements when they explode as supernovae. We survey the theory of the formation of the first galaxies in this context, focusing on the results of cosmological simulations to illustrate a number of the key processes that define their properties. We first discuss the evolution of the primordial gas as it is incorporated into the earliest galaxies under the influence of the high energy radiation emitted by the earliest stars; we then turn to consider how the injection of heavy elements by the first supernovae transforms the evolution of the primordial gas and alters the character of the first galaxies. Finally, we discuss the prospects for the detection of the first galaxies by future observational missions, in particular focusing on the possibility that primordial star-forming galaxies may be uncovered.