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The central regions of galaxy clusters are permeated by magnetic fields andfilled with relativistic electrons. When clusters merge, the magnetic fieldsare amplified and relativistic electrons are re-accelerated by turbulence inthe intra cluster medium. These electrons reach energies of 1 -- 10 GeV and, inthe presence of magnetic fields, produce diffuse radio halos that typicallycover an area of ~1 square Mpc. Here we report observations of four clusterswhose radio halos are embedded in much more extended, diffuse radio emission,filling a volume 30 times larger than that of radio halos. The emissivity inthese larger features is about 20 times lower than the emissivity in radiohalos. We conclude that relativistic electrons and magnetic fields extend farbeyond radio halos, and that the physical conditions in the outer regions ofthe clusters are quite different from those in the radio halos.

Galaxy clusters enveloped by vast volumes of relativistic electrons