Clark Lake observations of IC 443 and Puppis A

Details Clark Lake observations of IC 443 and Puppis A Clark Lake observations of IC 443 and Puppis A

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...290..596e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 290, March 15, 1985, p. 596-601.

Astronomy and Astrophysics

Astrophysics

26

Brightness Distribution, Emission Spectra, Radio Spectra, Stellar Spectrophotometry, Supernova Remnants, Electron Acceleration, Shock Waves, Synchrotron Radiation, Telescopes

Scientific paper

The supernova remnant IC 443 has been observed at 73.8, 57.1, 38.5, and 30.9 MHz with the Clark Lake TPT telescope. Puppis A has been observed at 57.5 MHz. In each case, the observed brightness distributions are essentially identical to those found at higher frequencies. This shows that free-free absorption is negligible in these remnants and that the spectrum of the radio emission is constant throughout each remnant. The spectrum of IC 443 is shown to be a power law from 20 MHz to 11 GHz with a spectral index of -0.36 + or 0.02. This is significantly different from the index of -0.50 predicted for the synchrotron emission from electrons accelerated by strong shocks, provided that such shocks have a compression ratio of 4. The lack of free-free absorption also shows that interstellar clouds are not compressed by these supernova remnants to the densities predicted by certain theories.

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