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

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arxiv 1906.07584 v1 pith:ZW7SOUX2 submitted 2019-06-18 astro-ph.GA

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

F. Govoni , E. Orr\`u , A. Bonafede , M. Iacobelli , R. Paladino , F. Vazza , M. Murgia , V. Vacca
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G. Giovannini L. Feretti F. Loi G. Bernardi C. Ferrari R.F. Pizzo C. Gheller S. Manti M. Br\"uggen G. Brunetti R. Cassano F. de Gasperin T.A. En{\ss}lin M. Hoeft C. Horellou H. Junklewitz H.J.A. R\"ottgering A.M.M. Scaife T.W. Shimwell R.J. van Weeren M. Wise
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keywords clustersgalaxyemissionradioridgeabellconnectingfilament
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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.

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Cited by 3 Pith papers

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  1. Multi-Wavelength Signatures of a Giant Cometary Radio Halo in MACSJ0417-1154

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    MACSJ0417’s giant radio halo shows spectral steepening and radio–X-ray correlation consistent with turbulence from a 6:1 off-axis merger that preserved the cool core; pure hadronic models are energetically excluded.

  2. Unravelling Turbulence and Magnetic Fields in Galaxy Clusters with SKA and XRISM

    astro-ph.HE 2026-07 conditional novelty 3.0

    A research framework combining XRISM turbulent velocity maps with SKA rotation measure grids to break degeneracies between magnetic field strength and cosmic-ray energetics in galaxy clusters.

  3. The Large-Scale Structure of the Universe through the SKA lenses

    astro-ph.CO 2026-06 unverdicted novelty 1.0

    This review chapter summarizes the cosmic web's theoretical framework, recent radio observations of diffuse gas, and the expected impact of the SKA on detecting baryons in filaments and cluster outskirts.