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Constraining magnetic fields in galaxy clusters

Published online by Cambridge University Press:  03 March 2020

Annalisa Bonafede ,
Chiara Stuardi ,
Federica Savini ,
Franco Vazza  and
Marcus Brüggen
Annalisa Bonafede
Affiliation:
Dipartimento di Fisica e Astronomia, Università di Bologna, via P. Gobetti 93/2, 40129, Bologna, Italy. INAF - Istituto di Radioastronomia, Via Gobetti 101, I-40129 Bologna, Italy. Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029, Hamburg, Germany. email: annalisa.bonafede@unibo.it
Chiara Stuardi
Affiliation:
Dipartimento di Fisica e Astronomia, Università di Bologna, via P. Gobetti 93/2, 40129, Bologna, Italy. INAF - Istituto di Radioastronomia, Via Gobetti 101, I-40129 Bologna, Italy.
Federica Savini
Affiliation:
Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029, Hamburg, Germany. email: annalisa.bonafede@unibo.it
Franco Vazza
Affiliation:
Dipartimento di Fisica e Astronomia, Università di Bologna, via P. Gobetti 93/2, 40129, Bologna, Italy. INAF - Istituto di Radioastronomia, Via Gobetti 101, I-40129 Bologna, Italy. Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029, Hamburg, Germany. email: annalisa.bonafede@unibo.it
Marcus Brüggen
Affiliation:
Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029, Hamburg, Germany. email: annalisa.bonafede@unibo.it
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Abstract

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Magnetic fields originate small-scale instabilities in the plasma of the intra-cluster medium, and may have a key role to understand particle acceleration mechanisms. Recent observations at low radio frequencies have revealed that synchrotron emission from galaxy clusters is more various and complicated than previously thought, and new types of radio sources have been observed. In the last decade, big steps forward have been done to constrain the magnetic field properties in clusters thanks to a combined approach of polarisation observations and numerical simulations that aim to reproduce Faraday Rotation measures of sources observed through the intra-cluster medium. In this contribution, I will review the results on magnetic fields reached in the last years, and I will discuss the assumptions that have been done so far in light of new results obtained from cosmological simulations. I will also discuss how the next generation of radio instruments, as the SKA, will help improving our knowledge of the magnetic field in the intra-cluster medium.

Keywords

Galaxy clustersmagnetic fieldnon-thermal phenomena
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium A30: Astronomy in Focus XXX , August 2018 , pp. 299 - 302
Copyright
© International Astronomical Union 2020

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