Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...122..129b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 122, no. 1-2, June 1983, p. 129-136.
Astronomy and Astrophysics
Astrophysics
54
Astronomical Models, Cosmic Rays, Particle Acceleration, Supernova Remnants, Interstellar Matter, Mathematical Models, Power Spectra, Shock Fronts
Scientific paper
A method is devised to approximate the spatially averaged momentum distribution function for the accelerated particles at the end of the active lifetime of a supernova remnant. The authors confine themselves to the test particle approximation and oversimplify adiabatic losses, but include unsteady shock motion, evolving shock strength, and non-uniform gas flow effects on the accelerated particle spectrum. Monoenergetic (T0 = 1 keV) protons are injected at the shock front. It is found that the dominant effect on the resultant accelerated particle spectrum is a changing spectral index with shock strength. High energy particles are produced in early phases, and the resultant distribution function is a slowly varying power law αT-μ, (T = kinetic energy), 2.1 ≤ μ ≤ 2.3 over several orders of magnitude, independent of the specific details of the supernova remnant.
Bogdan Thomas. J.
Völk Heinrich J.
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