Starburst galaxies as seen by gamma-ray telescopes

TL;DR

This paper reviews gamma-ray observations of starburst galaxies, highlighting their role in understanding cosmic rays and star formation, and discusses future prospects with the Cherenkov Telescope Array.

Contribution

It provides a comprehensive review of recent gamma-ray observations and theoretical models of starburst galaxies, emphasizing upcoming telescope capabilities.

Findings

Gamma-ray observations reveal non-thermal phenomena linked to cosmic rays.

Starburst galaxies significantly influence star formation through energetic feedback.

Next-generation telescopes will enhance understanding of galaxy evolution.

Abstract

Starburst galaxies have a highly increased star-formation rate compared to regular galaxies and inject huge amounts of kinetic power into the interstellar medium via supersonic stellar winds, and supernova explosions. Supernova remnants, which are considered to be the main source of cosmic rays (CRs), form an additional, significant energy and pressure component and might influence the star-formation process in a major way. Observations of starburst galaxies at \gamma-ray energies gives us the unique opportunity to study non-thermal phenomena associated with hadronic CRs and their relation to the star-formation process. In this work, recent observations of starburst galaxies with space and ground-based \gamma-ray telescopes are being reviewed and the current state of theoretical work on the \gamma-ray emission is discussed. A special emphasis is put on the prospects of the next-generation Cherenkov Telescope Array for the study of starburst galaxies in particular and star-forming galaxies in general.