Blast waves with cosmic-ray pressure

Journal Article · Thu Sep 15 04:00:00 EDT 1983 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/161338· OSTI ID:5475047

Chevalier, R A

The effects of cosmic-ray pressure on the dynamics of self-similar, spherical blast waves and driven waves are investigated on the assumptions that the ratio of relativistic cosmic-ray pressure to total pressure at the shock front is a constant w and the the cosmic rays and thermal gas evolve as independent adiabatic fluids in the postshock flow. For blast waves from a point explosion in a uniform medium, the cosmic rays dominate the pressure near r = 0 if w>0. The solutions show that, if w is small, the ratio of cosmic-ray energy to total energy in the blast wave is several times w. The solutions are used to make specific predictions of the pion-decay ..gamma..-ray flux from a blast wave as a function of w. If w is large, the predicted fluxes from supernova remnants are close to the current observational limits. It is also noted that cosmic rays may limit the compression in the radiative shock waves of supernova remnants. The addition of cosmic pressure does not change the geneal nature of the driven wave self-similar solutions. The solutions are used to predict the pion-decay ..gamma..-ray flux from a young Type II supernova interacting with circumstellar material. Observations these ..gamma..-rays from extragalactic supernovae are not promising, but a galactic supernova could be very bright in ..gamma..-rays.

• Research Organization: Department of Astronomy, University of Virginia
• OSTI ID: 5475047
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 272:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640101* -- Astrophysics & Cosmology-- Cosmic Radiation
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC PHOTONS
COSMIC RADIATION
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FLUID FLOW
FLUID MECHANICS
GAMMA RADIATION
HYDRODYNAMICS
IONIZING RADIATIONS
MASSLESS PARTICLES
MECHANICS
PHOTONS
RADIATION FLUX
RADIATION PRESSURE
RADIATIONS
SHOCK WAVES
SUPERNOVA REMNANTS