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We investigate the total kinetic powers (L_j) and ages (t_age) of powerfuljets in FR II radio galaxies by comparison of the dynamical model of expandingcocoons with observations. We select four FR II radio sources (Cygnus A, 3C223, 3C 284, and 3C 219), for which the mass-density profiles of intraclustermedium (ICM) are known in the literature. It is found that large fractions >0.02 - 0.7 of the Eddington luminosity (L_Edd) are carried away as a kineticpower of jet. The upper limit of estimated 2 L_j / L_Edd are larger than unity(< 10) for some sources, suggesting a possibility of super-Eddington massaccretions. As a consequence of the large powers, we also find that the totalenergy stored in the cocoon (E_c) exceeds the energy derived from the minimumenergy condition for the energy of radiating non-thermal electrons and magneticfields (E_min): 4< E_c /E_min <310. This implies that most of the energy incocoon is carried by invisible components such as thermal leptons (electron andpositron) and/or protons.

The estimate of kinetic powers of jets in FRII radio galaxies: existence of invisible components?