Radio Galaxy Physics at Low Frequencies: Lobes, Jets and Environments

Abstract. I discuss the key role of low-frequency observations in determining the physical properties of radio galaxies and radio-loud quasars, and their application in studies of the interaction between radio sources and their environments. Both observa-tions with the current generation of radio telescopes and the prospects for future work are discussed. 1. Why Work at Low Frequency? Radio-loud active galaxies (including radio galaxies and radio-loud quasars) are char-acterized by twin, oppositely-directed jets which emanate from the core at relativistic speeds and contain, at a minimum, electrons (and/or positrons) and magnetic fields. The interaction of these jets with the interstellar/intergalactic medium on kpc-Mpc scale