Non-thermal emission from galaxy clusters: a Pandora's vase for astrophysics

TL;DR

This paper discusses the significance of non-thermal emissions in galaxy clusters, emphasizing the need for combined observational and theoretical approaches to understand cosmic rays and magnetic fields for cosmological studies.

Contribution

It highlights the importance of integrating numerical, theoretical, and observational methods using upcoming radio, gamma-ray, and X-ray instruments to study non-thermal phenomena in galaxy clusters.

Findings

Deep radio observations confirm cosmic rays and magnetic fields in clusters.

A detailed physical characterization of non-thermal components remains incomplete.

Combining multi-wavelength observations with models is crucial for future progress.

Abstract

The existence of cosmic rays and weak magnetic fields in the intracluster volume has been well proven by deep radio observations of galaxy clusters. However a detailed physical characterization of the non-thermal component of large scale-structures, relevant for high-precision cosmology, is still missing. I will show the importance of combining numerical and theoretical works with cluster observations by a new-generation of radio, Gamma- and X-ray instruments.