022323_ec_cosmic-web-shock-waves_inline

Simulations of the cosmic web and its magnetic field (cyan), like the one pictured here, predict that shockwaves along filaments and around galaxy clusters should emit weak radio signals (pink). The inset shows what combining many radio images of galaxy cluster pairs in the simulated web might look like, with colors representing gas temperature and density (high values are yellow, low values are purple and black). F. VAZZA, D. WITTOR AND J. WEST