| Issue |
A&A
Volume 678, October 2023
|
|
|---|---|---|
| Article Number | L8 | |
| Number of page(s) | 8 | |
| Section | Letters to the Editor | |
| DOI | https://doi.org/10.1051/0004-6361/202346784 | |
| Published online | 20 October 2023 | |
Letter to the Editor
Exploring the origins of mega radio halos
1
Dipartimento di Fisica e Astronomia “Galileo Galilei”, Università di Padova, Vicolo dell’Osservatorio 3, 35122 Padova, Italy
e-mail: luca.beduzzi@studenti.unipd.it
2
Dipartimento di Fisica e Astronomia, Università di Bologna, Via Gobetti 92/3, 40121 Bologna, Italy
3
Istituto di Radio Astronomia, INAF, Via Gobetti 101, 40121 Bologna, Italy
4
Hamburger Sternwarte, University of Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
5
Osservatorio Astronomico di Padova, INAF, Vicolo Dell’Osservatorio 5, 35122 Padova, Italy
Received:
1
May
2023
Accepted:
25
August
2023
We present a first attempt to investigate the origin of radio-emitting electrons in the newly discovered class of mega radio halos in clusters of galaxies. We study the evolution of relativistic electrons accreted by the external regions of a simulated cluster of galaxies at high resolution, including the effect of radiative losses and turbulent reacceleration acting on relativistic electrons. We conclude that turbulent reacceleration induced by structure formation, if sufficiently prolonged, has the potential to produce a large reservoir of radio-emitting electrons in the large regions illuminated by mega radio halos observed by LOFAR.
Key words: large-scale structure of Universe / radiation mechanisms: non-thermal / galaxies: clusters: intracluster medium / methods: numerical / acceleration of particles
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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