radio halo

radio halo
A diffuse region of material, surrounding a galaxy or a pulsar, that emits radio waves

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  • Radio halo — Radio halos are large scale areas of radio emission found in clusters of galaxies. They do not have an obvious galaxy counterpart, as opposed, for example, to radio galaxies which have AGN counterparts. Their cause is still debated, but they may… …   Wikipedia

  • Radio relics — are diffuse synchrotron radio emission found in the peripheral regions of galaxy clusters. Similar to the case of radio halos, they do not have any obvious galaxy counterpart, but their shapes are much more elongated and irregular compared to… …   Wikipedia

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