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Ultrahigh energy cosmic rays as heavy nuclei from cluster accretion shocks
Susumu Inoue, Guenter Sigl, Francesco Miniati +1
Large-scale accretion shocks around massive clusters of galaxies, generically expected in hierarchical scenarios of cosmological structure formation, are shown to be potential sour…
Effects of Axion-Photon Mixing on Gamma-Ray Spectra from Magnetized Astrophysical Sources
Kathrin A. Hochmuth, Guenter Sigl
Astrophysical gamma-ray sources come in a variety of sizes and magnetizations. We deduce general conditions under which gamma-ray spectra from such sources would be significantly a…
Ultra High Energy Cosmic ray and gamma-ray signatures of inductive acceleration in AGN jets
Rachid Ouyed, Guenter Sigl, Maxim Lyutikov
The highest energy cosmic rays could be produced by drifts in magnetized, cylindrically collimated, sheared jets of powerful active galaxies (i.e. FR II radiogalaxies; radio loud q…
Ultra-High Energy Cosmic Rays and the GeV-TeV Diffuse Gamma-Ray Flux
Oleg E. Kalashev, Dmitry V. Semikoz, Guenter Sigl
Ultra-high energy cosmic ray protons accelerated in astrophysical objects produce secondary electromagnetic cascades during propagation in the cosmic microwave and infrared backgro…
Non-Universal Spectra of Ultra-High Energy Cosmic Ray Primaries and Secondaries in a Structured Universe
Guenter Sigl
Analytical calculations of extra-galactic cosmic ray spectra above ~10^17 eV are often performed assuming continuous source distributions, giving rise to spectra that depend little…
Ultrahigh energy cosmic rays as heavy nuclei from cluster accretion shocks
Susumu Inoue, Guenter Sigl, Francesco Miniati +1
Large-scale accretion shocks around massive clusters of galaxies, generically expected in the cold dark matter scenario of cosmological structure formation, are shown to be plausib…