Ultra-high energy cosmic rays deflection by the Intergalactic Magnetic Field

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.

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Cited by in corpus (8)

• Ultra-High-Energy Cosmic Rays: The Intersection of the Cosmic and Energy Frontiers
• The Gamma-Ray Window to Intergalactic Magnetism
• Search for Astrophysical Neutrinos from 1FLE Blazars with IceCube
• Cosmological Magnetogenesis: The Biermann Battery during the Epoch of Reionization
• Extragalactic magnetic field constraints from ultra-high-energy cosmic rays from local galaxies
• Account of the baryonic feedback effect in gamma-ray measurements of intergalactic magnetic fields
• Effects of large-scale magnetic fields on the observed composition of ultra high-energy cosmic rays
• On the Impact of Dark Matter Scattering on the Trajectory of High-Energy Cosmic Rays