# Faraday Rotation Measure Dependence on Galaxy Clusters Dynamics

## TL;DR

This study investigates how galaxy cluster dynamics influence magnetic fields by analyzing Faraday rotation measurements, revealing differences in magnetic field properties between relaxed and unrelaxed clusters and suggesting different magnetic field amplification mechanisms.

## Contribution

It provides the first comparative analysis of Faraday rotation in relaxed versus unrelaxed galaxy clusters, highlighting the impact of dynamical state on magnetic field characteristics.

## Key findings

- Unrelaxed clusters show higher RM dispersion and overlap frequency.
- Magnetic fields in unrelaxed systems have larger coherence lengths.
- Relaxed systems likely sustain magnetic fields through small-scale dynamo processes.

## Abstract

We study the magnetic fields in galaxy clusters through Faraday rotation measurements crossing systems in different dynamical states. We confirm that magnetic fields are present in those systems and analyze the difference between relaxed and unrelaxed samples with respect to the dispersion between their inherent Faraday Rotation measurements. We found an increase of this RM dispersion and a higher RM overlapping frequency for unrelaxed clusters. This fact suggests that a large scale physical process is involved in the nature of unrelaxed systems and possible depolarization effects are present in the relaxed ones. We show that dynamically unrelaxed systems can enhance magnetic fields to large coherence lengths. In contrast, the results for relaxed systems suggests that small-scale dynamo can be a dominant mechanism for sustaining magnetic fields, leading to intrinsic depolarization.