A radio ridge connecting two galaxy clusters in a filament of the cosmic web

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Science  07 Jun 2019:
Vol. 364, Issue 6444, pp. 981-984
DOI: 10.1126/science.aat7500

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A radio ridge between two galaxy clusters

Galaxy clusters contain dozens or hundreds of galaxies, vast quantities of hot gas, and large amounts of dark matter. The gas can emit at radio wavelengths if it contains electrons at relativistic speeds, which can be injected by active galaxies or accelerated during a merger between two clusters. Govoni et al. used the Low-Frequency Array (LOFAR) radio telescope to observe a ridge of radio-emitting plasma extending between two galaxy clusters that are approaching a merger. The results imply that intergalactic magnetic fields connect the two clusters and challenge theories of particle acceleration in the intergalactic medium.

Science, this issue p. 981