Further studies of particle acceleration in Cassiopeia A

Details Further studies of particle acceleration in Cassiopeia A Further studies of particle acceleration in Cassiopeia A

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..527c&link_type=abstract

Astrophysical Journal, Part 1, vol. 222, June 1, 1978, p. 527-536.

Astronomy and Astrophysics

Astronomy

24

Astronomical Models, Cassiopeia A, Particle Acceleration, Radio Astronomy, Supernova Remnants, Astronomical Spectroscopy, Cosmic Rays, Energetic Particles, Radio Frequencies

Scientific paper

Models are developed for statistical particle acceleration in the supernova remnant Cas A. The models are of the three-parameter variety, i.e., taking into account second-order Fermi acceleration, variable relativistic particle injection, and the observed radio properties of Cas A, especially the low frequency flux anomaly. It is noted that equations for adiabatic expansion conform more closely to empirical data than equations for particle escape. A downturning in the optical spectrum is observed, most likely due to synchrotron losses, and the bend in the galactic cosmic ray spectrum is attributed to energy losses within the source remnant rather than to propagation losses through the Galaxy. Attention is given to the maximum relativistic particle energy content of Cas A, which is compared with the estimated initial kinetic energy.

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