The centers in the core of galaxy clusters are permeated with magnetic fields, and are filled with relativistic electrons, which are electrons that move at speeds close to the speed of light. When galaxy clusters merge with each other, these magnetic fields amplify and the movement of relativistic electrons is again accelerated by disturbances in the medium within the clusters. These electrons have energy levels ranging from gigaelectronvolts to 10 gigaelectronvolts. In the presence of these magnetic fields, they produce scattered radio auras, usually covering an area of about one million parsecs.
In this published paper, the research team reports that it has made observations of four galaxy clusters with latent radio auras in a wider range of scattered radio emissions, occupying 30 times larger than the radio aura space. The ability of these larger structures to emit radio emissions is 20 times less than that of radio auras. The research team concludes that relativistic electrons and magnetic fields extend long distances beyond that of radio auras, and that the physical conditions on the outskirts of galaxy clusters are quite different from those that characterize radio auras.