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

Journal
Date Issued
2019
Author(s)
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Orrù, E.
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Iacobelli, M.
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Feretti, L.
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Ferrari, C.
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Pizzo, R. F.
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Manti, S.
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Brüggen, M.
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Enßlin, T. A.
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Hoeft, M.
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Horellou, C.
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Junklewitz, H.
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Röttgering, H. J. A.
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Scaife, A. M. M.
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Shimwell, T. W.
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van Weeren, R. J.
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Wise, M.
DOI
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.
Volume
364
Issue
6444
Start page
981
Uri
Url
Issn Identifier
0036-8075
Ads BibCode
2019Sci...364..981G
Rights
open.access
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