Anomalous radio-loudness of Cygnus A and other powerful radio galaxies

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Abstract
The nearby, extremely powerful radio galaxy Cygnus A stands out as having an atypically low far-infrared/radio luminosity ratio. It is demonstrated that in objects displaying such a low ratio the radio-loudness is anomalously high, which fact is connected to these objects inhabiting dense X-ray haloes. The enhanced radio emission is most likely due to strong radiation losses in the dense environment. It must be concluded that radio luminosity is not a good measure of AGN power.

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