The Shape of the Spectra in Extended Radio Sources

Details The Shape of the Spectra in Extended Radio Sources The Shape of the Spectra in Extended Radio Sources

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.4108k&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #41.08; Bulletin of the American Astronomical Society, Vol. 24, p.1185

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Scientific paper

Using an innovative technique for displaying the sychrotron spectrum, we have found that it is possible to describe the multifrequency observations taken by Carilli et al., (1991) of Cygnus A as a single shape spectrum that is simply shifted in both ln nu and ln I possibly as a result of changes in the magnetic field throughout the source. The shape of this spectrum is curved for both low and high frequencies, i.e. a power law is not seen; it does not show preference to alpha =-.5 or alpha =-.7, i.e. an injection index is not observed. These conclusions stand in direct contrast to standard analyses, which invoke a power law injection of electrons followed by steepening due to synchrotron losses. The appropriateness of that standard model, for Cygnus A and other sources, is thus called into question. This work is funded, in part, by NSF grant AST-91-00486 to the University of Minnesota. Reference Carilli, C.L., Perley, R.A., Dreher, J.W., & Leahy, J.P., 1991 ApJ 383 544

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