Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.207..745c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 207, April 15, 1984, p. 745-775.
Astronomy and Astrophysics
Astronomy
59
Radio Sources (Astronomy), Radio Spectra, Relativistic Electron Beams, Stellar Evolution, Supernova Remnants, Synchrotron Radiation, Adiabatic Conditions, Astronomical Models, Electron Acceleration, Energy Spectra, Galactic Cosmic Rays, Interstellar Gas, Magnetohydrodynamic Turbulence
Scientific paper
The acceleration of relativistic electrons by hydromagnetic turbulence in shell-type supernova remnants (SNRs) is examined in relation to their structural development through interaction with the interstellar medium. The transport equation governing the energy spectrum of the electrons is analytically solved, enabling study of the evolution of their synchrotron radio emission. The sudden emergence of SNRs as long-lived radio sources, several decades after the supernova event, is then explained. Their subsequent radio evolution, with spectral changes and structural details as exemplified by the young remnant Cassiopeia A, follows naturally. The absence of younger radio remmnants in the Galaxy implies a supernova rate lower than that inferred from extragalactic observations. The collective properties of galactic SNRs suggest a mild acceleration of electrons throughout the adiabatic phase of evolution. SNRs may thus contribute significantly to cosmic-ray electrons in the Galaxy.
Cowsik Ramanath
Sarkar Sourav
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