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Studying the Effect of Shock Obliquity on the -ray and Diffuse Radio Emission in Galaxy Clusters
Denis Wittor, Franco Vazza, Marcus Brüggen
Observations of diffuse radio emission in galaxy clusters indicate that cosmic-ray electrons are accelerated on Mpc scales. However, protons appear to be accelerated less eff…
Galaxy cluster outskirts from the thermal SZ and non-thermal synchrotron link
Kaustuv Basu, Jens Erler, Martin Sommer +2
Galaxy cluster merger shocks are the main agent for the thermalization of the intracluster medium and the energization of cosmic ray particles in it. Shock propagation changes the…
On the non-thermal energy content of cosmic structures
Franco Vazza, Denis Wittor, Marcus Brüggen +1
1) Background: the budget of non-thermal energy in galaxy clusters is not well constrained, owing to the observational and theoretical difficulties in studying these diluted plasma…
Testing cosmic-ray acceleration with radio relics: a high-resolution study using MHD and tracers
Denis Wittor, Franco Vazza, Marcus Brüggen
Weak shocks in the intracluster medium may accelerate cosmic-ray protons and cosmic-ray electrons differently depending on the angle between the upstream magnetic field and the sho…
Turbulence and Vorticity in Galaxy Clusters Generated by Structure Formation
F. Vazza, T. W. Jones, M. Brüggen +4
Turbulence is a key ingredient for the evolution of the intracluster medium, whose properties can be predicted with high resolution numerical simulations. We present initial result…
ALMA-SZ Detection of a Galaxy Cluster Merger Shock at Half the Age of the Universe
Kaustuv Basu, Martin Sommer, Jens Erler +5
We present ALMA measurements of a merger shock using the thermal Sunyaev-Zel'dovich (SZ) effect signal, at the location of a radio relic in the famous El Gordo galaxy cluster at $z…
Propagation of Ultra High Energy Cosmic Rays in Extragalactic Magnetic Fields: A view from cosmological simulations
Stefan Hackstein, Franco Vazza, Marcus Brueggen +2
We use the CRPropa code to simulate the propagation of ultra high energy cosmic rays (with energy and pure proton composition) through extragalactic magnetic…
Evolution of cosmic filaments and of their galaxy population from MHD cosmological simulations
Claudio Gheller, Franco Vazza, Marcus Brueggen +4
Despite containing about a half of the total matter in the Universe, at most wavelengths the filamentary structure of the cosmic web is difficult to observe. In this work, we use l…
Constraining the efficiency of cosmic ray acceleration by cluster shocks
F. Vazza, M. Brueggen, D. Wittor +3
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 shock front at the radio relic of Abell 2744
Dominique Eckert, Mathilde Jauzac, Franco Vazza +5
Radio relics are Mpc-scale diffuse radio sources at the peripheries of galaxy clusters which are thought to trace outgoing merger shocks. We present XMM-Newton and Suzaku observati…
Detecting the cosmic web with radio surveys
F. Vazza, M. Brueggen, C. Gheller +2
We study the challenges to detect the cosmic web at radio wavelengths with state-of-the-art cosmological simulations of extragalactic magnetic fields. The incoming generation of ra…