Extra-galactic magnetic fields and the second knee in the cosmic-ray spectrum

Abstract

Recent work suggests that the cosmic ray spectrum may be dominated by Galactic sources up to ~10^{17.5} eV, and by an extra-Galactic component beyond, provided this latter cuts off below the transition energy. Here it is shown that this cut-off could be interpreted in this framework as a signature of extra-galactic magnetic fields with equivalent average strength B and coherence length l_c such that B\sqrt{l_c} ~ 2-3.10^{-10} G.Mpc^{1/2}, assuming l_c < r_L (Larmor radius at 10^{17} eV) and continuously emitting sources with density 10^{-5}/Mpc^3. The extra-Galactic flux is suppressed below 10^{17} eV as the diffusive propagation time from the source to the detector becomes larger than the age of the Universe.

6 pages, 2 figures; expanded version to appear in Phys.Rev.D

References in corpus (2)

• Constrained Simulations of the Magnetic Field in the Local Universe and the Propagation of UHECRs
• Diffusion and drift of cosmic rays in highly turbulent magnetic fields

Cited by in corpus (95)

• The Astrophysics of Ultrahigh Energy Cosmic Rays
• CRPropa 3 - a Public Astrophysical Simulation Framework for Propagating Extraterrestrial Ultra-High Energy Particles
• A dip in the UHECR spectrum and the transition from galactic to extragalactic cosmic rays
• Ultra high energy cosmic rays: implications of Auger data for source spectra and chemical composition
• On the transition from Galactic to extragalactic cosmic-rays: spectral and composition features from two opposite scenarios
• UHE nuclei propagation and the interpretation of the ankle in the cosmic-ray spectrum
• Extragalactic propagation of ultrahigh energy cosmic-rays
• Cosmogenic Neutrinos from the propagation of Ultra High Energy Nuclei
• 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
• Ultra High Energy Cosmic Rays: The disappointing model
• 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
• Transition from galactic to extragalactic cosmic rays
• Propagation of high-energy cosmic rays in extragalactic turbulent magnetic fields: resulting energy spectrum and composition
• Cosmogenic Neutrinos Challenge the Cosmic Ray Proton Dip Model
• Anisotropies of ultra-high energy cosmic rays diffusing from extragalactic sources
• The need for a local source of UHE CR nuclei
• Effects of uncertainties in simulations of extragalactic UHECR propagation, using CRPropa and SimProp
• The optical depth of the Universe to ultrahigh energy cosmic ray scattering in the magnetized large scale structure
• Neutrino Background Flux from Sources of Ultrahigh-Energy Cosmic-Ray Nuclei
• Diffusion of Cosmic Rays in Expanding Universe. (I)
• Reconciling the ultra-high energy cosmic ray spectrum with Fermi shock acceleration
• Ultrahigh Energy Cosmic Ray Nuclei from Extragalactic Pulsars and the effect of their Galactic counterparts
• Are gamma-ray bursts the sources of ultra-high energy cosmic rays?
• Neutrinos: the Key to UHE Cosmic Rays
• Constraining the sources of ultra-high-energy cosmic rays across and above the ankle with the spectrum and composition data measured at the Pierre Auger Observatory
• Inhomogeneous extragalactic magnetic fields and the second knee in the cosmic ray spectrum
• Magnetic diffusion effects on the Ultra-High Energy Cosmic Ray spectrum and composition
• Progress in high-energy cosmic ray physics
• Implications of Strong Intergalactic Magnetic Fields for Ultra-High-Energy Cosmic-Ray Astronomy
• Relativistic Fermi acceleration with shock compressed turbulence
• Signatures of the transition from galactic to extragalactic cosmic rays
• Diffusion of Cosmic Rays in the Expanding Universe. II. Energy Spectra of Ultra-High Energy Cosmic Rays
• Time-dependent neutrino emission from Mrk 421 during flares and predictions for IceCube
• Cosmic rays in galactic and extragalactic magnetic fields
• Anisotropies of ultra-high energy cosmic ray nuclei diffusing from extragalactic sources
• Ultrahigh energy cosmic rays from a nearby extragalactic source in the diffusive regime
• Spacetime noncommutativity and ultra-high energy cosmic ray experiments
• On the shape of the UHE cosmic ray spectrum
• Signatures of the extragalactic cosmic-ray source composition from spectrum and shower depth measurements
• Diffusion of cosmic rays at EeV energies in inhomogeneous extragalactic magnetic fields
• Constraining models for the origin of ultra-high-energy cosmic rays with a novel combined analysis of arrival directions, spectrum, and composition data measured at the Pierre Auger Observatory
• 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
• Revisiting the distance to the nearest UHECR source: Effects of extra-galactic magnetic fields
• Constraining the Emissivity of Ultrahigh Energy Cosmic Rays in the Distant Universe with the Diffuse Gamma-ray Emission
• Neutron β-decay as the origin of IceCube's PeV (anti)neutrinos
• Effects of the galactic magnetic field upon large scale anisotropies of extragalactic Cosmic Rays
• Extragalactic cosmic rays diffusing from two populations of sources
• Magnetized Sources of Ultra-high Energy Nuclei and Extragalactic Origin of the Ankle
• Non-Universal Spectra of Ultra-High Energy Cosmic Ray Primaries and Secondaries in a Structured Universe
• IceCube Constraints on Fast-Spinning Pulsars as High-Energy Neutrino Sources
• Impact of Galaxy Clusters on UHECR propagation
• Energetics of ultrahigh-energy cosmic-ray nuclei
• Cosmic Rays around $10^{18}$eV: Implications of Contemporary Measurements on the Origin of the Ankle Feature
• Cosmic ray anisotropies from transient extragalactic sources
• Acceleration and propagation of ultrahigh energy cosmic rays
• Impact of the Magnetic Horizon on the Interpretation of the Pierre Auger Observatory Spectrum and Composition Data
• Bounds on the origin of extragalactic ultrahigh energy cosmic rays from the IceCube neutrino observations
• Bound on the Photon Charge from the Phase Coherence of Extragalactic Radiation
• Magnetic diffusion and interaction effects on Ultrahigh Energy Cosmic Rays: protons and nuclei
• A closer look at the spectrum and small scale anisotropies of UHECRs
• A scenario for the Galactic cosmic rays between the knee and the second-knee
• Astrophysical Bounds on the Photon Charge and Magnetic Moment
• Selected Topics in Cosmic Ray Physics
• Transition from Galactic to Extra-Galactic Cosmic Rays
• A signature of EeV protons of Galactic origin
• Dip in UHECR and Transition from Galactic to Extragalactic Cosmic Rays
• Influence of cosmological models on the GZK horizon of ultrahigh energy protons
• Ultrahigh-energy dipole and beyond
• Anisotropies of Diffusive Ultra-high Energy Cosmic Rays in $f(R)$ Gravity Theory
• Small Scale Anisotropy Predictions for the Auger Observatory
• The flux suppression at the highest energies
• Direct Measurements, Acceleration and Propagation of Cosmic Rays
• Impact of the finite life-time of UHECR sources
• Case for Centaurus A as the main source of ultrahigh-energy cosmic rays
• Ultraheavy Ultrahigh-Energy Cosmic Rays
• Magnetic Suppression of Cosmic Rays' Flux in $\mathbf{f}(\mathbf{R})$ and $\mathbf{f}(\mathbf{Q})$ Theories of Gravity
• Effects of large-scale magnetic fields on the observed composition of ultra high-energy cosmic rays
• High Energy Astroparticle Physics
• The origin of ultra high energy cosmic rays
• Analysing Ultra High Energy Cosmic Rays' Anisotropy in $\mathbf{f}(\mathbf{R},\mathbf{T})$ Gravity Theory
• High Energy Cosmic Rays from Local GRBs
• On the relation between the astrophysical neutrino fluxes and the cosmic ray fluxes
• High Energy Neutrinos and Cosmic Rays
• Ultra High Energy Cosmic Rays Diffusion in an Expanding Universe
• Modelling Cosmic Rays Flux with Pierre Auger and Telescope Array Data in $\mathbf{f}(\mathbf{R})$ and $\mathbf{f}(\mathbf{Q})$ Theories of Gravity
• Study of Galactic interactions and propagation properties of ultrahigh energy cosmic rays using the precision spectrum from the Pierre Auger Observatory
• Impact of the EPOS.LHC-R hadronic interaction model on the Centaurus A ultrahigh-energy cosmic-ray scenario
• Ultra-high energy cosmic ray propagation in the Universe
• Open questions with ultra-high energy cosmic rays
• Ultra-high energy cosmic rays with UFA-15 source model in Bumblebee gravity theory