The injection and feedback of Cosmic Rays in large-scale structures

TL;DR

This paper introduces a numerical implementation for cosmic ray injection and feedback in large-scale cosmological simulations, revealing their spatial distribution and impact on observable cluster properties.

Contribution

It presents a novel numerical method for modeling cosmic ray injection and feedback within the ENZO simulation code, enabling detailed study of their effects on large-scale structures.

Findings

CR energy in clusters is less than a few percent of gas energy

CR ratio is higher near cluster accretion regions (0.1-0.3)

CR feedback affects X-ray and Sunyaev-Zeldovich signals

Abstract

We present the numerical implementation of run-time injection of Cosmic Rays energy, their spatial advection and their dynamical feedack on baryonic gas in the cosmological grid code ENZO. We discuss the results of its application to large-scale simulations showing that the CR energy inside clusters of galaxies is small compared to the gas energy (less than a few percent), while the ratio is larger near the accretion regions of clusters and filaments (about 0.1-0.3). CR feedback has a small, but significant impact on the X-ray emission and Sunyaev-Zeldovich effect from clusters.