Bulletin of the Astronomical Society of India
M. Jamrozy*
Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Kraków, Poland
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The morphology and spectra of extended radio emission from galaxies contain a record of their central activity and provide a unique opportunity to study the time scales of active galactic nuclei duty cycles. Deep low-frequency radio studies have proved to be useful in probing episodic or recurrent jet activity in radio galaxies.
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Keywords : galaxies: active – radiation mechanisms: non-thermal – radio continuum: galaxies