Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..32...55r&link_type=abstract
Astrophysics and Space Science, vol. 32, Jan. 1975, p. 55-75.
Astronomy and Astrophysics
Astrophysics
2
Cosmic Rays, Galactic Clusters, Pulsars, Supernovae, Extraterrestrial Radiation, Particle Acceleration, Radiation Sources
Scientific paper
The capabilities and limitations of pulsars as sources of cosmic rays are reviewed in the light of experimental observations. Pulsars can supply the cosmic ray power if they have rotational velocities in excess of 700 rad per sec at birth. Though this is theoretically possible, there is no experimental proof for the same. Pulsars can accelerate particles to the highest energies of 10 to the 20th eV, but in general, the spectra on simple considerations, turn out to be flatter than the observed cosmic ray spectrum. At the highest energies, absorption processes due to fragmentation and photodisintegration dominate for heavy nuclei. The existence of a steady flux of cosmic rays of energy greater than 10 to the 17th eV demands acceleration of particles to last over fifty years, the time interval between supernovae outbursts, whereas the expected period of activity is less than a few years. Finally, the problem of anistropy with relevance to pulsars as sources and the possibility of observing pulsar accelerated particles from galactic clusters is considered.
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