Multifrequency radio observations of Cygnus A - Spectral aging in powerful radio galaxies

Details Multifrequency radio observations of Cygnus A - Spectral aging in powerful radio galaxies Multifrequency radio observations of Cygnus A - Spectral aging in powerful radio galaxies

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383..554c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 383, Dec. 20, 1991, p. 554-573.

Astronomy and Astrophysics

Astronomy

235

Galactic Evolution, Radio Astronomy, Radio Galaxies, Radio Jets (Astronomy), Astronomical Models, Cygnus Constellation, Emission Spectra, Particle Acceleration, Radio Spectra, Synchrotron Radiation

Scientific paper

A detailed analysis of the radio spectrum across the lobes of Cygnus A is presented in order to critically test the synchroton spectral aging theory. The results are in good agreement with the jet model for powerful radio galaxies, involving particle acceleration at the hot spots and outflow into the radio lobes, with subsequent energy loss due to synchrotron radiation. The hot spot spectra are well represented by a spectral aging model involving continuous injection of relativistic particles. Both hot spots have spectral break frequencies around 10 GHz. An injection index of 0.5 is found for both hot spots, consistent with diffusive shock acceleration at a strong nonrelativistic shock in a Newtonian fluid. The LF hot spot emission spectrum falls below the injected power law. This effect is isolated to the hot spots, and is best explained by a low-energy cutoff in the particle distribution.

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