Inhomogeneous extragalactic magnetic fields and the second knee in the cosmic ray spectrum

Abstract

Various experiments indicate the existence of a second knee around energy E=3.10^{17} eV in the cosmic ray spectrum. This feature could be the signature of the end of the galactic component and of the emergence of the extragalactic one, provided that the latter cuts off at low energies. Recent analytical calculations have shown that this cut-off could be a consequence of the existence of extragalactic magnetic fields: low energy protons diffuse on extragalactic magnetic fields and cannot reach the observer within a given time. We study the influence of inhomogeneous magnetic fields on the magnetic horizon, using a new semi-analytical propagation code. Our results indicate that, at a fixed value of the volume averaged magnetic field <B>, the amplitude of the low energy cut-off is mainly controled by the strength of magnetic fields in the voids of the large scale structure distribution.

15 pages, 10 figures. Version to appear in PRD (minor changes)

References in corpus (27)

• Cosmological SPH simulations: A hybrid multi-phase model for star formation
• Cosmological Hydrodynamics with Adaptive Mesh Refinement: a new high resolution code called RAMSES
• Origin of Galactic and Extragalactic Magnetic Fields
• High Energy Neutrinos from Astrophysical Sources: An Upper Bound
• Extension of the Cosmic-Ray Energy Spectrum Beyond the Predicted Greisen-Zatsepin-Kuz'min Cutoff
• On astrophysical solution to ultra high energy cosmic rays
• The Protogalactic Origin for Cosmic Magnetic Fields
• Constrained Simulations of the Magnetic Field in the Local Universe and the Propagation of UHECRs
• Measurement of the Flux of Ultrahigh Energy Cosmic Rays from Monocular Observations by the High Resolution Fly's Eye Experiment
• Transport of Cosmic Rays in Chaotic Magnetic Fields
• Intergalactic Magnetic Fields from Quasar Outflows
• Turbulence, magnetic fields and plasma physics in clusters of galaxies
• Ultra-High Energy Cosmic Ray Probes of Large Scale Structure and Magnetic Fields
• UHE nuclei propagation and the interpretation of the ankle in the cosmic-ray spectrum
• Extra-galactic magnetic fields and the second knee in the cosmic-ray spectrum
• The Origin and Evolution of Cosmic Magnetism
• Diffusive propagation of UHECR and the propagation theorem
• Simulations of magnetic fields in filaments
• Diffusion and drift of cosmic rays in highly turbulent magnetic fields
• Diffusion of Cosmic Rays in Expanding Universe. (I)
• Anti-GZK effect in Ultra High Energy Cosmic Rays diffusive propagation
• Extragalactic UHE proton spectrum and prediction for iron-nuclei flux at 10^8 - 10^9 GeV
• Cosmic Ray Acceleration by Spiral Shocks in the Galactic Wind
• Was the Cosmic Web of Protogalactic Material Permeated by Lobes of Radio Galaxies During the Quasar Era?
• Magnetic field amplification in CDM anisotropic collapse
• Non-Universal Spectra of Ultra-High Energy Cosmic Ray Primaries and Secondaries in a Structured Universe
• Galactic modulation of extragalactic cosmic rays: Possible origin of the knee in the cosmic ray spectrum

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• The Astrophysics of Ultrahigh Energy Cosmic Rays
• CRPropa 3 - a Public Astrophysical Simulation Framework for Propagating Extraterrestrial Ultra-High Energy Particles
• Cosmogenic Neutrinos: parameter space and detectabilty from PeV to ZeV
• Open Questions in Cosmic-Ray Research at Ultrahigh Energies
• Angular, spectral, and time distributions of highest energy protons and associated secondary gamma-rays and neutrinos propagating through extragalactic magnetic and radiation fields
• Extragalactic propagation of ultrahigh energy cosmic-rays
• Cosmic Rays Above the Second Knee from Clusters of Galaxies and Associated High-Energy Neutrino Emission
• Cosmic-ray energy spectrum and composition up to the ankle - the case for a second Galactic component
• Cosmological MHD simulation of a cooling flow cluster
• Cosmogenic photon and neutrino fluxes in the Auger era
• Propagation of ultrahigh energy nuclei in clusters of galaxies: resulting composition and secondary emissions
• Cosmic Ray Anisotropy as Signature for the Transition from Galactic to Extragalactic Cosmic Rays
• Ultra-High-Energy Cosmic Rays: The Intersection of the Cosmic and Energy Frontiers
• Cosmogenic Neutrinos Challenge the Cosmic Ray Proton Dip Model
• IMAGINE: A comprehensive view of the interstellar medium, Galactic magnetic fields and cosmic rays
• The optical depth of the Universe to ultrahigh energy cosmic ray scattering in the magnetized large scale structure
• Effects of uncertainties in simulations of extragalactic UHECR propagation, using CRPropa and SimProp
• Neutrino Background Flux from Sources of Ultrahigh-Energy Cosmic-Ray Nuclei
• Are gamma-ray bursts the sources of ultra-high energy cosmic rays?
• Ultrahigh Energy Cosmic Ray Nuclei from Extragalactic Pulsars and the effect of their Galactic counterparts
• Magnetic diffusion effects on the Ultra-High Energy Cosmic Ray spectrum and composition
• Implications of Strong Intergalactic Magnetic Fields for Ultra-High-Energy Cosmic-Ray Astronomy
• Massive star cluster origin for the galactic cosmic ray population at very-high energies
• Cosmic rays in galactic and extragalactic magnetic fields
• Continuous-time random-walk model for anomalous diffusion in expanding media
• High-energy neutrinos from sources in clusters of galaxies
• Is the Ultra-High Energy Cosmic-Ray Excess Observed by the Telescope Array Correlated with IceCube Neutrinos?
• Diffusion of cosmic rays at EeV energies in inhomogeneous extragalactic magnetic fields
• What can be learnt from UHECR anisotropies observations? Paper I : large-scale anisotropies and composition features
• Acceleration and propagation of ultra high energy cosmic rays
• Neutron β-decay as the origin of IceCube's PeV (anti)neutrinos
• Continuous time random walks and Fokker-Planck equation in expanding media
• IceCube Constraints on Fast-Spinning Pulsars as High-Energy Neutrino Sources
• Detectability of ultrahigh energy cosmic ray signatures in gamma rays
• Efficient micromirror confinement of sub-TeV cosmic rays in galaxy clusters
• Energetics of ultrahigh-energy cosmic-ray nuclei
• Synchrotron pair halo and echo emission from blazars in the cosmic web: application to extreme TeV blazars
• Selected Topics in Cosmic Ray Physics
• A signature of EeV protons of Galactic origin
• Encounter-controlled coalescence and annihilation on a one-dimensional growing domain
• The standard and the fractional Ornstein-Uhlenbeck process on a growing domain
• Lévy walk dynamics in non-static media
• Inverse problem for extragalactic transport of ultra-high energy cosmic rays
• Effects of large-scale magnetic fields on the observed composition of ultra high-energy cosmic rays
• Constraining the baryon loading factor of AGN jets: implication from the gamma-ray emission of the Coma cluster