New spectral index maps of 3C 449 show a flat spectrum in the inner jets that steepens outward, yielding radiative ages of ~150 Myr at the lobe edges and implying supersonic average expansion speeds if those ages represent the full dynamical lifetime.
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Mapping the emission and spectral properties of the FRI radio galaxy 3C 449 with LOFAR and the VLA
New spectral index maps of 3C 449 show a flat spectrum in the inner jets that steepens outward, yielding radiative ages of ~150 Myr at the lobe edges and implying supersonic average expansion speeds if those ages represent the full dynamical lifetime.