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Published July 9, 2014 | Accepted Version
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The Radio Spectrum of Supernova Remnants

Harris, D. E.


960 Mc/s observations of thirteen galactic sources generally assumed to be supernova remnants, are coupled with previous observations at other frequencies to derive spectral indices. Although several values of spectral index are found in the neighborhood of zero, arguments are presented that free-free transitions are not the primary cause of the radio emission. An interpretation of the relatively large range of spectral indices is suggested on the basis of an evolutionary sequence in which young, bright objects with relatively steep spectra gradually evolve into old, faint objects with flat or inverted spectra.

Additional Information

It is a pleasure to thank Gordon Stanley for his critical reading of this manuscript and his many helpful suggestions. I would also like to express my gratitude to the staff and graduate students for their help in obtaining the observations and to R. Minkowski for his comments on the optical features of the sources and for the deep red plates reproduced in Appendix III. Much of this paper would have been impossible without access to the Manchester work on the Cygnus Loop and I am indebted to D. Mathewson for sending that in advance of publication. Special thanks are also due G. Westerhout for the 400 Mc/s flux densities of several sources. Finally, I would like to acknowledge the Consultants Bureau Inc., who kindly provided pre-publication translations of Shklovsky's papers. The observations reported here were carried out under Office of Naval Research Contract Nonr 220(19).

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