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Secondary photons and neutrinos from cosmic rays produced by distant blazars
Warren Essey, Oleg E. Kalashev, Alexander Kusenko +1
Secondary photons and neutrinos produced in the interactions of cosmic ray protons emitted by distant Active Galactic Nuclei (AGN) with the photon background along the line of sigh…
Dark Matter Search Using Chandra Observations of Willman 1, and a Spectral Feature Consistent with a Decay Line of a 5 keV Sterile Neutrino
Michael Loewenstein, Alexander Kusenko
We report the results of a search for an emission line from radiatively decaying dark matter in the Chandra X-ray Observatory spectrum of the ultra-faint dwarf spheroidal galaxy Wi…
Astrophysical Sources of Cosmic Rays and Related Measurements with the Pierre Auger Observatory
The Pierre Auger Collaboration, J. Abraham, P. Abreu +469
Studies of the correlations of ultra-high energy cosmic ray directions with extra-Galactic objects, of general anisotropy, of photons and neutrinos, and of other astrophysical effe…
The Cosmic Ray Energy Spectrum and Related Measurements with the Pierre Auger Observatory
The Pierre Auger Collaboration, J. Abraham, P. Abreu +469
Studies of the cosmic ray energy spectrum at the highest energies with the Pierre Auger Observatory.
A new interpretation of the gamma-ray observations of active galactic nuclei
Warren Essey, Alexander Kusenko
Gamma-ray telescopes have reported some surprising observations of multi-TeV photons from distant active galactic nuclei (AGN), which show no significant attenuation due to pair pr…
Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory
The Pierre Auger Collaboration, J. Abraham, P. Abreu +458
From direct observations of the longitudinal development of ultra-high energy air showers performed with the Pierre Auger Observatory, upper limits of 3.8%, 2.4%, 3.5% and 11.7% (a…