Physics
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999rvmps..71..165c&link_type=abstract
Reviews of Modern Physics, Volume 71, Issue 2, March 1999, pp.S165-S172
Physics
28
Cosmic Rays, Background Radiations, Gamma-Ray Sources, Gamma-Ray Bursts, Electric And Magnetic Fields, Surveys And Tutorial Papers, Resource Letters, Cosmic Rays, Background Radiations, Gamma-Ray Sources, Gamma-Ray Bursts, Electric And Magnetic Fields, Surveys And Tutorial Papers, Resource Letters
Scientific paper
Cosmic rays are an ever present aspect of nature. The birth of the field of elementary-particle physics can be traced to studies of cosmic rays. Now advances in technology and new instrumentation are changing the nature of cosmic-ray research. New forms of astronomy are being created. Ground-based instruments, spawned by cosmic-ray techniques, permit the observation of astrophysical objects emitting radiation in very-high-energy gamma rays, (>=100 GeV), high-energy neutrinos (>=1 TeV), and the most energetic particles found in the cosmic radiation (>=5×1019 eV). At these energies the galactic and intergalactic magnetic fields deflect the cosmic-ray protons by only a few degrees. The interaction of these cosmic rays with the cosmic background radiation limits the possible sources to redshifts far less than unity. The origin of these highest-energy cosmic rays is not understood. The present status of knowledge of these cosmic rays and the prospects for solving the mystery concerning their origin are the subjects of this brief article.
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