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Journal Article

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

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Enßlin,  T. A.
Computational Structure Formation, MPI for Astrophysics, Max Planck Society;

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Citation

Govoni, F., Orrù, E., Bonafede, A., Iacobelli, M., Paladino, R., Vazza, F., et al. (2019). A radio ridge connecting two galaxy clusters in a filament of the cosmic web. Science, 364(6444), 981-985. doi:10.1126/science.aat7500.


Cite as: https://hdl.handle.net/21.11116/0000-0004-482F-8
Abstract
Galaxy clusters are the most massive gravitationally bound structures in the Universe.They
grow by accreting smaller structures in a merging process that produces shocks and
turbulence in the intracluster gas.We observed a ridge of radio emission connecting the
merging galaxy clusters Abell 0399 and Abell 0401 with the Low-Frequency Array (LOFAR)
telescope network at 140 megahertz. This emission requires a population of relativistic
electrons and a magnetic field located in a filament between the two galaxy clusters. We
performed simulations to show that a volume-filling distribution of weak shocks may
reaccelerate a preexisting population of relativistic particles, producing emission at radio
wavelengths that illuminates the magnetic ridge.