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Title:
Clark Lake observations of IC 443 and Puppis A
Authors:
Erickson, W. C.; Mahoney, M. J.
Affiliation:
AA(Clark Lake Radio Observatory, College Park, MD), AB(Clark Lake Radio Observatory, Borrego Springs, CA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 290, March 15, 1985, p. 596-601. (ApJ Homepage)
Publication Date:
03/1985
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
BRIGHTNESS DISTRIBUTION, EMISSION SPECTRA, RADIO SPECTRA, STELLAR SPECTROPHOTOMETRY, SUPERNOVA REMNANTS, ELECTRON ACCELERATION, SHOCK WAVES, SYNCHROTRON RADIATION, TELESCOPES
DOI:
10.1086/163016
Bibliographic Code:
1985ApJ...290..596E

Abstract

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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