Speaker
Warren Essey
Description
Secondary photons and neutrinos produced in the interactions of cosmic ray
protons and gamma rays emitted by distant Active Galactic Nuclei (AGN) with
the photon background along the line of sight can reveal a wealth of new
information about the intergalactic magnetic fields (IGMF), extragalactic
background light (EBL), and the acceleration mechanisms of cosmic rays. The
secondary photons may have already been observed by gamma-ray telescopes.
With the inclusion of secondary photons the current upper limits on the
extragalactic background light are significantly weakened and new limits are set for the intergalactic magnetic fields for a wide range of cosmic ray and gamma ray models. Recent results from IceCube may also hint at the first observation of secondary neutrinos. Ramifications for the cosmic backgrounds, magnetic
fields, and AGN models will be discussed.
