Distribution of relativistic particles behind magnetized mixed shocks - Application to synchrotron radio sources

Details Distribution of relativistic particles behind magnetized mixed shocks - Application to synchrotron radio sources Distribution of relativistic particles behind magnetized mixed shocks - Application to synchrotron radio sources

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...196...71p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 196, no. 1-2, May 1988, p. 71-83. CNRS-supported research.

Astronomy and Astrophysics

Astronomy

12

Magnetic Effects, Particle Motion, Radio Sources (Astronomy), Relativistic Particles, Shock Wave Propagation, Synchrotron Radiation, Beta Factor, Flow Stability, Galactic Nuclei, Radio Spectra, Supernova Remnants

Scientific paper

Introduction of moderate magnetic corrections to the theory of mixed shocks gives rise to new constraints to the structure of the shock and interesting corrections to the radio index of the synchrotron spectrum. Whereas the authors found a wide range of possible mixed shocks in their previous work (Pelletier and Roland, 1986) in the limit MA→∞, their present analysis shows that the finite Alfvénic Mach number effects involve an avoidable heating significantly greater than the unmagnetized case. One of the most interesting result of this work is an extension of the validity of the spectral index formula given by the linear theory to the most common astrophysical situations. It is shown how it is possible to use the radio spectral index to make a diagnosis of young supernova remnants with a flat radio spectral index, radio active galactic nuclei, hot spots similar to those of Cygnus A and finally hot spots with a very steep radio spectral index.

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