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Published online by Cambridge University Press: 07 August 2017
Spectroscopic observations have shown that strong radio galaxies contain extra–nuclear gas which is rapidly rotating (Simkin 1979, Heckman et al. 1985). In addition, weak spiral-like structure has been observed in the inner regions of several strong radio galaxies classified as DE or E (Simkin and Michel 1986, Beichman et al. 1985, Hansen et al. 1987, Baum et al. 1988).