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The KDA (Kaiser, Dennett-Thorpe & Alexander, 1997) EXT model, that is, theextension of the KDA model of FR (Faranoff & Riley) II-type source evolution,is applied and confronted with the observational data for selected FR II-typeradio sources with significantly aged radio spectra. A sample of FR II-typeradio galaxies with radio spectra strongly bent at their highest frequencies isused for testing the usefulness of the KDA EXT model.The dynamical evolution ofFR II-type sources predicted with the KDA EXT model is briefly presented anddiscussed. The results are then compared to the ones obtained with theclassical KDA approach, assuming the source's continuous injection andself-similarity. The results and corresponding diagrams obtained for the eightsample sources indicate that the KDA EXT model predicts the observed radiospectra significantly better than the best spectral fit provided by theoriginal KDA model.

Studying the highly bent spectra of FR II-type radio galaxies with the KDA EXT model