Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sva....21...48b&link_type=abstract
(Astronomicheskii Zhurnal, vol. 54, no. 1, 1977, p. 85-95.) Soviet Astronomy, vol. 21, Jan.-Feb. 1977, p. 48-54. Translation.
Astronomy and Astrophysics
Astronomy
1
High Energy Electrons, Magnetohydrodynamic Waves, Relativistic Particles, Stellar Envelopes, Stellar Models, Supernova Remnants, Cosmic Rays, Gamma Rays, Interstellar Gas, Nickel Isotopes, Particle Acceleration, Positron Annihilation
Scientific paper
Different models are critically evaluated for relativistic-electron production in supernova shells during early stages and at the initial moment of shell deceleration by swept-up interstellar gas. Conditions are clarified under which relativistic electrons may be formed by a sequence of steps involving beta-decay of Ni-56, positron annihilation and gamma-ray production, gamma-ray scattering accompanied by subrelativistic-electron production, preliminary particle acceleration with their conservation in a 'synchrotron boiler', and terminal acceleration by MHD waves. It is noted that this sequence cannot accelerate ultrarelativistic ions due to stringent injection conditions. A mechanism is proposed for secondary acceleration of cosmic rays from Cas A in a region associated with 'stretching' of magnetic-field lines from the nebula by 'nonstationary' filaments.
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