Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972ap%26ss..16..238h&link_type=abstract
Astrophysics and Space Science, Volume 16, Issue 2, pp.238-240
Astronomy and Astrophysics
Astrophysics
23
Scientific paper
It is suggested that cosmic rays of energies as high as 1020 eV consist of dust grains of relativistic energies. Such dust grains as typical in interstellar space are accelerated first by a strong radiation pressure of luminous, compact galaxies and then by magnetic processes. A grain with the mass of about 10-16 g and the Lorentz factor of about 103 attains an energy as large as 1020 eV and produces a huge extensive air shower. Such grains survive against the collisions with cosmic microwave photons. This would remove the serious difficulty, if both the cosmic microwave radiation and the huge extensive air showers, which were regarded as due to protons of energies greater than 1019 eV, existed in spite of that the protons should strongly attenuate by the collisions with the radiation.
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