# Radio source evolution and the interplay with the host galaxy

## TL;DR

This paper explores how extragalactic jets influence galaxy evolution, focusing on jet dynamics, interactions with galactic environments, and the processes leading to different jet classifications, using advanced simulations.

## Contribution

It provides new insights into jet evolution mechanisms, especially the impact of galactic interactions and mass loading on jet morphology and kinematics, based on relativistic simulations.

## Key findings

- Jet interactions with galactic atmospheres affect FRII jet kinematics.
- Mass loading from stellar winds influences FRI jet deceleration.
- Simulations reveal processes shaping jet morphology and evolution.

## Abstract

There is compelling evidence showing that extragalactic jets are a crucial ingredient in the evolution of host galaxies and their environments. Extragalactic jets are well collimated and relativistic, both in terms of thermodynamics and kinematics at sub-parsec and parsec scales. They generate strong shocks in the ambient medium, associated with observed hotspots in FRII radio galaxies, and carve cavities that are filled with the shocked jet flow, dragging a large fraction of the interstellar gas along, in the form of slow, massive outflows within the host galaxies. In this paper, I discuss relevant processes associated to jet evolution in the frame of FRI-FRII dichotomy. In particular, I focus on the role of 1) the interaction between galactic atmospheres and the jet head on global FRII jet kinematics, and 2) mass load by stellar winds or small-scale instabilities on jet deceleration in FRI jets. The results presented are based on 3D relativistic hydrodynamical (RHD) and/or 2D axisymmetric, time-independent relativistic magnetohydrodynamical (RMHD) simulations.