Max-Planck-Institute for Radioastronomy, Bonn, Germany
A Common Origin of Galactic and Extragalactic Cosmic Rays
The origin of cosmic rays at all energies is still uncertain. In this lecture we present and explore a model to produce cosmic rays with energy ranging up to 3×1020 eV. The model allows an explanation of a variety of recent data:
We show here that just our Galaxy and the radio galaxy Cen A, each with their own galactic cosmic ray particles, but with those from the radio galaxy pushed up in energy by a relativistic shock in the jet emanating from the active black hole, are able to describe the most recent data.
Contrary to widely held expectations, no other extragalactic source population is required to explain the data, even at energies far below the general cutoff expected at 6×1019 eV, the Greisen-Zatsepin-Kuzmin turn-off due to interaction with the cosmological microwave background. We present several predictions for the detailed spectra, the cosmic ray composition and the propagation to Earth which can be tested in the near future.