Implications of Strong Intergalactic Magnetic Fields for Ultra-High-Energy Cosmic-Ray Astronomy

Abstract

We study the propagation of ultra-high-energy cosmic rays in the magnetised cosmic web. We focus on the particular case of highly magnetised voids ($B\sim \text{nG}$), using the upper bounds from the Planck satellite. The cosmic web was obtained from purely magnetohydrodynamical cosmological simulations of structure formation considering different power spectra for the seed magnetic field in order to account for theoretical uncertainties. We investigate the impact of these uncertainties on the propagation of cosmic rays, showing that they can affect the measured spectrum and composition by up to $\simeq 80\%$ and $\simeq 5\%$, respectivelly. In our scenarios, even if magnetic fields in voids are strong, deflections of 50 EeV protons from sources closer than $\sim$50 Mpc are less than $15^{\circ }$ in approximately 10-50% of the sky, depending on the distribution of sources and magnetic power spectrum. Therefore, UHECR astronomy might be possible in a significant portion of the sky depending on the primordial magnetic power spectrum, provided that protons constitute a sizeable fraction of the observed UHECR flux.

12 pages, 10 figures

References in corpus (18)

• Turbulence and Magnetic Fields in the Large Scale Structure of the Universe
• Depth of Maximum of Air-Shower Profiles at the Pierre Auger Observatory: Measurements at Energies above 10^17.8 eV
• Indications of Intermediate-Scale Anisotropy of Cosmic Rays with Energy Greater Than 57 EeV in the Northern Sky Measured with the Surface Detector of the Telescope Array Experiment
• Combined fit of spectrum and composition data as measured by the Pierre Auger Observatory
• Study of Ultra-High Energy Cosmic Ray Composition Using Telescope Array's Middle Drum Detector and Surface Array in Hybrid Mode
• On the amplification of magnetic fields in cosmic filaments and galaxy clusters
• Constraints on the origin of cosmic rays above $10^{18}$ eV from large scale anisotropy searches in data of the Pierre Auger Observatory
• Propagation of high-energy cosmic rays in extragalactic turbulent magnetic fields: resulting energy spectrum and composition
• Propagation of UHE Protons through Magnetized Cosmic Web
• High energy radiation from Centaurus A
• Inhomogeneous extragalactic magnetic fields and the second knee in the cosmic ray spectrum
• Bayesian analysis of the dynamic cosmic web in the SDSS galaxy survey
• Propagation of Ultra High Energy Cosmic Rays in Extragalactic Magnetic Fields: A view from cosmological simulations
• The Galactic Magnetic Field and Ultrahigh-Energy Cosmic Ray Deflections
• The Size, Shape and Orientation of Cosmological Voids in the Sloan Digital Sky Survey
• Diffusion of cosmic rays at EeV energies in inhomogeneous extragalactic magnetic fields
• Magnetic Deflections of Ultra-High Energy Cosmic Rays from Centaurus A
• The Centaurus A Ultrahigh-Energy Cosmic Ray Excess and the Local Extragalactic Magnetic Field

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• Evolution of primordial magnetic fields during large-scale structure formation
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• Magnetogenesis at Cosmic Dawn: Tracing the Origins of Cosmic Magnetic Fields
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• Ultra-high energy cosmic rays deflection by the Intergalactic Magnetic Field
• Can astrophysical neutrinos trace the origin of the detected ultra-high energy cosmic rays?
• Near-future discovery of point sources of ultra-high-energy neutrinos
• Anisotropies of Ultra-high Energy Cosmic Rays Dominated by a Single Source in the Presence of Deflections
• Quantum gravity phenomenology at the dawn of the multi-messenger era -- A review
• Using Deep Learning to Enhance Event Geometry Reconstruction for the Telescope Array Surface Detector
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• On the Measurement of the Helicity of Intergalactic Magnetic Fields Using Ultra-High-Energy Cosmic Rays
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• Effects of large-scale magnetic fields on the observed composition of ultra high-energy cosmic rays
• Effective Viscosity in the Intracluster Medium During Magnetic Field Amplification via Turbulent Dynamo
• Effects of extragalactic magnetic field on the spectra of ultra-high-energy cosmic rays from jetted sources
• Extragalactic Sources and Propagation of UHECRs