The First Stars
Jarrett L. Johnson, Thomas H. Greif, Volker Bromm
TL;DR
This paper reviews recent advances in understanding the formation of the first stars and galaxies in the universe, focusing on physical processes like cooling, radiation, supernovae, and chemical signatures.
Contribution
It synthesizes current knowledge on early star formation physics, including HD cooling, UV feedback, supernova impacts, and chemical abundance observations.
Findings
HD cooling influences primordial gas collapse
UV radiation from first stars affects galaxy formation
Supernova explosions shape early chemical enrichment
Abstract
The formation of the first generations of stars at redshifts z > 15-20 signaled the transition from the simple initial state of the universe to one of increasing complexity. We here review recent progress in understanding the assembly process of the first galaxies, starting with cosmological initial conditions and modelling the detailed physics of star formation. In particular, we study the role of HD cooling in ionized primordial gas, the impact of UV radiation produced by the first stars, and the propagation of the supernova blast waves triggered at the end of their brief lives. We conclude by discussing how the chemical abundance patterns observed in extremely low-metallicity stars allow us to probe the properties of the first stars.
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