Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...396l..39b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 396, no. 1, Sept. 1, 1992, p. L39-L42.
Astronomy and Astrophysics
Astrophysics
37
Shock Wave Propagation, Supernova Remnants, Supernova 1987A, Synchrotron Radiation, Light Curve, Radio Emission, Stellar Winds, Supernovae
Scientific paper
It is suggested that synchrotron radiation emitted by electrons undergoing diffusive acceleration at the supernova blast wave is the cause of the reappearance of radio emission from SN 1987A in July 1990. The light curve and spectrum which would be produced by a constant rate of particle injection occurring in a localized region of the shock front, i.e., in a clump or knot, is found. Observations indicate that two such clumps have been encountered to date. From the observed delay in the switch-on of the emission between 843 MHz and 4.8 GHz, a spatial diffusion coefficient for electrons of 2 x 10 exp 20 sq m/s is found. Estimating the magnetic field to be 10 exp -7 T and assuming the diffusion coefficient is constant, it is concluded that the shock encountered the first clump on about day 900 and the second clump on day 1190. The compression ratio of the shock responsible for electron acceleration is found to be 2.7. This implies strong modification of the shock front which may be due to the acceleration of cosmic rays.
Ball Lewis
Kirk John G.
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