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Science. 2019 Jun 7;364(6444):981-984. doi: 10.1126/science.aat7500.

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

Author information

1
Istituto Nazionale di Astrofisica-Osservatorio Astronomico di Cagliari Via della Scienza 5, I09047 Selargius, Italy. federica.govoni@inaf.it.
2
ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA, Dwingeloo, Netherlands.
3
Istituto Nazionale di Astrofisica-Istituto di Radioastronomia, Bologna Via Gobetti 101, I40129 Bologna, Italy.
4
Dipartimento di Fisica e Astronomia, Università degli Studi di Bologna, Via Gobetti 93/2, I40129 Bologna, Italy.
5
Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany.
6
Istituto Nazionale di Astrofisica-Osservatorio Astronomico di Cagliari Via della Scienza 5, I09047 Selargius, Italy.
7
Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa.
8
Square Kilometre Array South Africa, 3rd Floor, The Park, Park Road, Pinelands 7405, South Africa.
9
Université Côte d'Azur, Observatoire de la Côte d'Azur, Centre National de la Recherche Scientifique, Laboratoire Lagrange, Blvd. de l'Observatoire, CS 34229, 06304 Nice Cedex 4, France.
10
Swiss Plasma Center, Ecole Polytechnique Fédérale de Lausanne, 1015 Ecublens, Lausanne, Switzerland.
11
Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy.
12
Leiden University, Rapenburg 70, 2311 EZ Leiden, Netherlands.
13
Max Planck Institut für Astrophysik, Karl-Schwarzschild-Str.1, D-85740 Garching, Germany.
14
Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, D-80539, München, Germany.
15
Thüringer Landessternwarte, Sternwarte 5, 07778 Tautenburg, Germany.
16
Chalmers University of Technology, Dept. of Space, Earth and Environment, Onsala Space Observatory, SE-439 92 Onsala, Sweden.
17
Argelander Institut für Astronomie, Auf dem Hügel, 71 D-53121 Bonn, Germany.
18
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
19
SRON Netherlands Institute for Space Research Sorbonnelaan 2, 3584 CA Utrecht, Netherlands.

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.

PMID:
31171695
DOI:
10.1126/science.aat7500

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