Propagation of Ultra High Energy Cosmic Rays in Extragalactic Magnetic Fields: A view from cosmological simulations

Abstract

We use the CRPropa code to simulate the propagation of ultra high energy cosmic rays (with energy $\ge 10^{18}\mathrm{eV}$ and pure proton composition) through extragalactic magnetic fields that have been simulated with the cosmological ENZO code.We test both primordial and astrophysical magnetogenesis scenarios in order to investigate the impact of different magnetic field strengths in clusters, filaments and voids on the deflection of cosmic rays propagating across cosmological distances. We also study the effect of different source distributions of cosmic rays around simulated Milky-Way like observers. Our analysis shows that the arrival spectra and anisotropy of events are rather insensitive to the distribution of extragalactic magnetic fields, while they are more affected by the clustering of sources within a $\sim 50$ Mpc distance to observers. Finally, we find that in order to reproduce the observed degree of isotropy of cosmic rays at $\sim$ EeV energies, the average magnetic fields in cosmic voids must be $\sim 0.1\mathrm{nG}$, providing limits on the strength of primordial seed fields.

13 pages, 20 figures

References in corpus (12)

• Big-Bang Nucleosynthesis
• Cluster Magnetic Fields from Galactic Outflows
• Magnetic Field Seeding by Galactic Winds
• On the amplification of magnetic fields in cosmic filaments and galaxy clusters
• Radio galaxies of the local universe: all-sky catalog, luminosity functions, and clustering
• Magnetic Fields in the Milky Way
• On the ultra-high energy cosmic ray horizon
• CRPropa: A Numerical Tool for the Propagation of UHE Cosmic Rays, Gamma-rays and Neutrinos
• Cosmic Rays: The Second Knee and Beyond
• Full sky harmonic analysis hints at large UHECR deflections
• The GZK horizon and constraints on the cosmic ray source spectrum from observations in the GZK regime
• The flux suppression at the highest energies

Cited by in corpus (13)

• Simulations of extragalactic magnetic fields and of their observables
• Simulations of ultra-high Energy Cosmic Rays in the local Universe and the origin of Cosmic Magnetic Fields
• A survey of the thermal and non-thermal properties of cosmic filaments
• The Nuclear Window to the Extragalactic Universe
• Constraints on UHECR sources and extragalactic magnetic fields from directional anisotropies
• UHECR mass composition at highest energies from anisotropy of their arrival directions
• Ultra-high energy cosmic rays deflection by the Intergalactic Magnetic Field
• The dispersion measure and rotation measure from fast radio burst host galaxies based on the IllustrisTNG50 simulation
• Near-future discovery of point sources of ultra-high-energy neutrinos
• Magnetically Induced Anisotropies in the Arrival Directions of Ultra-high-energy Cosmic Rays from Nearby Radio Galaxies
• How complex is the cosmic web?
• Cosmic Clues from Amaterasu: Blazar-Driven Ultrahigh-Energy Cosmic Rays?
• Energetic particles and high-energy processes in cosmological filaments and their astronomical implications