A radio halo is a type of diffuse emission found in some galaxy clusters, which appears as a large, extended region of radio waves emitting cosmic rays and relativistic electrons. Radio halos are typically associated with the presence of turbulent magnetic fields and are thought to be a result of the interactions within the intracluster medium (ICM) during cluster mergers. These structures are observed at wavelengths of several centimeters to several meters and are often studied using radio telescopes.
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