Physics
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..apr..g601g&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, April 18-21, 1997, abstract #G6.01
Physics
Scientific paper
High energy particles play an important role in energetic sources, both galactic and extragalactic. The energy region around 100 TeV is crucial for understanding the origin of galactic cosmic rays because this is a characteristic maximum energy for diffusive acceleration by supernova blast waves, which are likely sources of galactic cosmic rays. Shock acceleration may also be responsible for accelerating particles to much higher energies in extragalactic sources, but more exotic sources of the very highest energy particles have also been suggested. There are several outstanding questions at present: What is the explanation of observed differences in spectra of different elements in the energy region below 100 TeV? If the supernova model is correct, why are supernova remnants not bright sources of TeV gamma-rays? What are the sources of galactic cosmic rays with energies above the nominal (100 TeV) cutoff? Above what energy are the observed particles of extragalactic origin? What is the nature and origin of the very highest energy particles, those with energies above 5× 10^19 eV? I will review what is known about spectrum and elemental composition of high energy cosmic rays with these questions in mind.
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