# Interactions Between Radio Galaxies and Cluster Shocks - 1: Jet Axes Aligned with Shock Normals

## TL;DR

This study uses 3D MHD simulations to explore how radio galaxy jets interact with cluster shocks, revealing disruption, vortex formation, magnetic amplification, and observable signatures relevant to galaxy cluster environments.

## Contribution

It provides new insights into the complex dynamics of radio galaxy and shock interactions, including jet disruption mechanisms and magnetic field amplification effects.

## Key findings

- Shock disrupts jet cocoons into ring vortices
- Strong winds can reverse or strip jets
- Magnetic amplification enhances synchrotron emissions

## Abstract

We report from a study utilizing 3D MHD simulations, including cosmic-ray electrons, of the interactions between radio galaxies (RGs) and dynamically active ICMs. Here we consider interactions involving plane ICM shocks having Mach numbers 2--4 and their normals aligned with steady, active bipolar RG jets penetrating uniform, stationary ICMs. Shock impact disrupts the pre-formed RG jet cocoons into ring vortex structures. Sufficiently strong post-shock winds can stop and even reverse the upwind jet, and strip jets to virtually "naked" states, leaving them without a surrounding cocoon. Strong shock-induced vorticity can also disrupt the downwind jet, so that the ring vortex remnant of the cocoons appears ahead of that jet's visible terminus. Magnetic field amplification in the ring vortex can significantly enhance its synchrotron emissions well after the vortex becomes isolated from the RG and its fresh CRe supply. We examine these dynamics and their observable consequences in detail.