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We study the radio power of the core and its relation to the opticalproperties of the host galaxy in samples of high excitation (HERG) and lowexcitation (LERG) Fanaroff-Riley type II (FRII) radio galaxies. The radiogalaxy sample is divided into two groups of core/non-core FRII, based on theexistence of strong, weak or lack of single radio core component. We show thatFRII LERGs with radio emission of the core have significantly higher [O III]line luminosities compared to the non-core LERG FRIIs. There is no significantdifference between the hosts of the core and non-core FRIIs of LERG type ingalaxy sizes, concentration indices, star formation rates, 4000-\AA\ breakstrengths, colours, black hole masses and black hole to stellar masses. We showthat the results are not biased by the stellar masses, redshifts and angularsizes of the radio galaxies. We argue that the detection of higher [O III]luminosities in the core FRIIs may indicate the presence of higher amounts ofgas, very close to the AGN nucleus in the core FRIIs compared to the non-coreFRIIs or may result from the interaction of the radio jets with this gas. Thecore and non-core FRIIs of the HERG type show no significant differencesperhaps due to our small sample size. The effect of relativistic beaming on theradio luminosities and the contribution of restating AGN activity have alsobeen considered.

The relation between the radio emission of the core and host galaxy properties in Fanaroff-Riley type II radio galaxies