Limiting the shock acceleration of cosmic-ray protons in the ICM

Abstract

Observations of large-scale radio emissions prove the existence of shock accelerated cosmic-ray electrons in galaxy clusters, while the lack of detected $\gamma$-rays limits the acceleration of cosmic-ray protons in galaxy clusters. This challenges our understanding of how diffusive shock acceleration works. In this work, we couple the most updated recipes for shock acceleration in the intracluster medium to state-of-the-art magneto-hydrodynamical simulations of massive galaxy clusters. Furthermore, we use passive tracer particles to follow the evolution of accelerated cosmic-rays. We show that when the interplay between magnetic field topology and the feedback from accelerated cosmic rays is taken into account, the latest developments of particle acceleration theory give results which are compatible with observational constraints.

published by Monthly Notices of the Royal Astronomical Society: Letters, 6 pages, 4 figures

References in corpus (12)

• Diffuse Radio Emission from Galaxy Clusters
• Non-Thermal Electron Acceleration in Low Mach Number Collisionless Shocks. I. Particle Energy Spectra and Acceleration Mechanism
• Resolved magnetic dynamo action in the simulated intracluster medium
• Non-Thermal Electron Acceleration in Low Mach Number Collisionless Shocks. II. Firehose-Mediated Fermi Acceleration and its Dependence on Pre-Shock Conditions
• Relativistic protons in the Coma galaxy cluster: first gamma-ray constraints ever on turbulent reacceleration
• Dynamical evolution of magnetic fields in the intracluster medium
• Testing cosmic-ray acceleration with radio relics: a high-resolution study using MHD and tracers
• Self-Similar Evolution of Cosmic-Ray-Modified Quasi-Parallel Plane Shocks
• Electron Preacceleration in Weak Quasi-perpendicular Shocks in High-beta Intracluster Medium
• Shocks and non-thermal particles in clusters of galaxies
• Polarisation of Radio Relics in Galaxy Clusters
• Evolution of vorticity and enstrophy in the intracluster medium

Cited by in corpus (15)

• Exploring the spectral properties of radio relics I: Integrated spectral index and Mach number
• CRESCENDO: An on-the-fly Fokker-Planck Solver for Spectral Cosmic Rays in Cosmological Simulations
• Shock waves in the magnetized cosmic web: the role of obliquity and cosmic-ray acceleration
• Radio relics radio emission from multi-shock scenario
• Turbulent magnetic fields in the merging galaxy cluster MACS J0717.5+3745: polarization analysis
• Life cycle of cosmic-ray electrons in the intracluster medium
• Ultra-Steep Spectrum Radio `Jellyfish' Uncovered in Abell 2877
• Using the polarization properties of double radio relics to probe the turbulent compression scenario
• Cosmic Ray Acceleration and Nonthermal Radiation at Accretion Shocks in the Outer Regions of Galaxy Clusters
• Electron Preacceleration at Weak Quasi-perpendicular Intracluster Shocks: Effects of Preexisting Nonthermal Electrons
• On the Challenges of Cosmic-Ray Proton Shock Acceleration in the Intracluster Medium
• A multishock scenario for the formation of radio relics
• A morphological analysis of the substructures in radio relics
• Cosmological simulations of the generation of cluster-scale radio emission from turbulent re-acceleration
• Modelling the Energy Spectra of Radio Relics