High energy particles from cosmic sources
H. Meyer
University of Wuppertal, 42119 Wuppertal, Germany
In this review it will be attempted to briefly cover some of
the recent developments in the observation of photons and
neutrinos to constrain models on the origin and acceleration
of cosmic rays. It appears that EGRET on board of CGRO
provides most valuable new data in that context. Data from
high energy airshower arrays and Tscherenkov telescopes add to
the picture although not yet strong enough to really decipher
the origin of cosmic rays. Searches for high energy neutrinos
in underground detectors put further constraints on models
in particular on possible origins of the highest
energy cosmic rays. Most spectacular is the EGRET
observation of a particular gamma ray burst deepening the
mystery of the gamma ray burst phenomenon. Further
ongoing observations of cosmic ray photons and
neutrinos should get us closer to an understanding of
the origin of cosmic rays.