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23 April 2024

» arxiv » 1906.7584

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A radio ridge connecting two galaxy clusters in a filament of the cosmic web
F. Govoni ; E. Orrù ; A. Bonafede ; M. Iacobelli ; R. Paladino ; F. Vazza ; M. Murgia ; V. Vacca ; G. Giovannini ; L. Feretti ; F. Loi ; G. Bernardi ; C. Ferrari ; R.F. Pizzo ; C. Gheller ; S. Manti ; M. Brüggen ; G. Brunetti ; R. Cassano ; F. de Gasperin ; T.A. Enßlin ; M. Hoeft ; C. Horellou ; H. Junklewitz ; H.J.A. Röttgering ; A.M.M. Scaife ; T.W. Shimwell ; R.J. van Weeren ; M. Wise ;
Date:	18 Jun 2019
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 intra-cluster gas. We observed a ridge of radio emission connecting the merging galaxy clusters Abell 0399 and Abell 0401 with the Low Frequency Array (LOFAR) at 140 MHz. 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 re-accelerate a pre-existing population of relativistic particles, producing emission at radio wavelengths that illuminates the magnetic ridge.
Source:	arXiv, 1906.7584
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