# Constraining the efficiency of cosmic ray acceleration by cluster shocks

@article{Vazza2016ConstrainingTE,
title={Constraining the efficiency of cosmic ray acceleration by cluster shocks},
author={Franco Vazza and Marcus Brueggen and Denis Wittor and Claudio Gheller and Dominique Eckert and Matthew Lynn Stubbe},
journal={Monthly Notices of the Royal Astronomical Society},
year={2016},
volume={459},
pages={70-83}
}
• Published 8 March 2016
• Physics
• Monthly Notices of the Royal Astronomical Society
We study the acceleration of cosmic rays by collisionless structure formation shocks with ENZO grid simulations. Data from the FERMI satellite enable the use of galaxy clusters as a testbed for particle acceleration models. Based on advanced cosmological simulations that include different prescriptions for gas and cosmic rays physics, we use the predicted {\gamma}-ray emission to constrain the shock acceleration efficiency. We infer that the efficiency must be on average <0.1% for cosmic shocks…

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## References

SHOWING 1-10 OF 97 REFERENCES

### Electron and proton acceleration efficiency by merger shocks in galaxy clusters

• Physics
• 2015
Radio relics in galaxy clusters are associated with powerful shocks that (re) accelerate relativistic electrons. It is widely believed that the acceleration proceeds via diffusive shock acceleration.

### Simulations of cosmic rays in large-scale structures: numerical and physical effects

• Physics
• 2014
Non-thermal (relativistic) particles are injected into the cosmos by structure formation shock waves, active galactic nuclei and stellar explosions. We present a suite of unigrid cosmological

### Numerical modelling of gamma radiation from galaxy clusters

We investigate the spatial and spectral properties of non-thermal emission from clusters of galaxies at γ-ray energies. We estimate the radiation flux between 10 keV and 10 TeV due to inverse-Compton

### COSMOLOGICAL MAGNETOHYDRODYNAMIC SIMULATIONS OF GALAXY CLUSTER RADIO RELICS: INSIGHTS AND WARNINGS FOR OBSERVATIONS

• Physics
• 2012
Non-thermal radio emission from cosmic-ray electrons in the vicinity of merging galaxy clusters is an important tracer of cluster merger activity, and is the result of complex physical processes that

### Constraining cosmic rays and magnetic fields in the Perseus galaxy cluster with TeV observations by the MAGIC telescopes

• Physics
• 2012
Galaxy clusters are being assembled today in the most energetic phase of hierarchical structure formation which manifests itself in powerful shocks that contribute to a substantial energy density of

### Do radio relics challenge diffusive shock acceleration

• Physics
• 2014
Radio relics in galaxy clusters are thought to be associated with powerful shock waves that accelerate particles via diffusive shock acceleration (DSA). Among the particles accelerated by DSA,

### Nonthermal Radiation from Clusters of Galaxies: The Role of Merger Shocks in Particle Acceleration

• Physics
• 2003
Nonthermal radiation is observed from clusters of galaxies in the radio, hard X-rays, and possibly in the soft X-ray/UV bands. While it is known that radiative processes related to nonthermal

• Physics
• 2010
We use results from a constrained, cosmological magnetohydrodynamic (MHD) simulation of the Local Universe to predict radio haloes and their evolution for a volume-limited set of galaxy clusters and

### SEARCH FOR COSMIC-RAY-INDUCED GAMMA-RAY EMISSION IN GALAXY CLUSTERS

• Physics
• 2014
Current theories predict relativistic hadronic particle populations in clusters of galaxies in addition to the already observed relativistic leptons. In these scenarios hadronic interactions give

### Thermal and non-thermal traces of AGN feedback: results from cosmological AMR simulations

• Physics
• 2013
We investigate the observable effects of feedback from Active Galactic Nuclei (AGN) on non-thermal components of the intracluster medium (ICM). We have modelled feedback from AGN in cosmological