CERN Accelerating science

Article
Report number	arXiv:2101.07207
Title	Ultrahigh energy cosmic ray deflection by the intergalactic magnetic field
Related title	Ultra-high energy cosmic rays deflection by the Intergalactic Magnetic Field
Author(s)	Garcia, Andres Aramburo (Leiden U.) ; Bondarenko, Kyrylo (CERN ; Ecole Polytechnique, Lausanne) ; Boyarsky, Alexey (Leiden U.) ; Nelson, Dylan (U. Heidelberg, ITP) ; Pillepich, Annalisa (Heidelberg, Max Planck Inst. Astron.) ; Sokolenko, Anastasia (Vienna, OAW)
Publication	2021-10-11
Imprint	2021-01-18
Number of pages	6
In:	Phys. Rev. D 104 (2021) 083017
DOI	10.1103/PhysRevD.104.083017 (publication)
Subject category	astro-ph.HE ; Astrophysics and Astronomy
Abstract	The origin and composition of ultra-high energy cosmic rays (UHECRs) remain a mystery. The common lore is that UHECRs are deflected from their primary directions by the Galactic and extragalactic magnetic fields. Here we describe an extragalactic contribution to the deflection of UHECRs that does not depend on the strength and orientation of the initial seed field. Using the IllustrisTNG simulations, we show that outflow-driven magnetic bubbles created by feedback processes during galaxy formation deflect approximately half of all $10^{20}$ eV protons by $1^{\circ}$ or more, and up to $20$-$30^{\circ}$. This implies that the deflection in the intergalactic medium must be taken into account in order to identify the sources of UHECRs.
Copyright/License	publication: © 2021-2025 authors (License: CC-BY-4.0) preprint: (License: CC-BY-4.0)

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