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We present the results of a uniform and systematic search for blue-shifted FeK absorption lines in the X-ray spectra of five bright Broad-Line RadioGalaxies (BLRGs) observed with Suzaku. We detect, for the first time at X-raysin radio-loud AGN, several absorption lines at energies greater than 7 keV inthree out of five sources, namely 3C 111, 3C 120 and 3C 390.3. The lines aredetected with high significance according to both the F-test and extensiveMonte Carlo simulations. Their likely interpretation as blue-shifted Fe XXV andFe XXVI K-shell resonance lines implies an origin from highly ionized gasoutflowing with mildly relativistic velocities, in the range 0.04-0.15c. A fitwith specific photo-ionization models gives ionization parameters in the rangelog_xi~4-5.6 and column densities of N_H~10^22-10^23 cm^-2. Thesecharacteristics are very similar to those of the Ultra-Fast Outflows (UFOs)previously observed in radio-quiet AGN. Their estimated location within~0.01-0.3pc from the central super-massive black hole suggests a likely originrelated with accretion disk winds/outflows. Depending on the absorber coveringfraction, the mass outflow rate of these UFOs can be comparable to theaccretion rate and their kinetic power can correspond to a significant fractionof the bolometric luminosity and is comparable to their typical jet power.Therefore, these UFOs can play a significant role in the expected feedback fromthe AGN on the surrounding environment and can give us further clues on therelation between the accretion disk and the formation of winds/jets in bothradio-quiet and radio-loud AGN.

Discovery of ultra-fast outflows in a sample of Broad Line Radio Galaxies observed with Suzaku