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X-ray absorption line spectroscopy has recently shown evidence for previouslyunknown Ultra-fast Outflows (UFOs) in radio-quiet AGNs. In the previous paperof this series we defined UFOs as those absorbers with an outflow velocityhigher than 10,000km/s and assessed the statistical significance of theassociated blueshifted FeK absorption lines in a large sample of 42 localradio-quiet AGNs observed with XMM-Newton. In the present paper we report adetailed curve of growth analysis and directly model the FeK absorbers with theXstar photo-ionization code. We confirm that the frequency of sources in theradio-quiet sample showing UFOs is >35%. The outflow velocity distributionspans from \sim10,000km/s (\sim0.03c) up to \sim100,000km/s (\sim0.3c), with apeak and mean value of \sim42,000km/s (\sim0.14c). The ionization parameter isvery high and in the range log\xi 3-6erg s^{-1} cm, with a mean value of log\xi4.2 erg s^{-1} cm. The associated column densities are also large, in the rangeN_H\sim10^{22}-10^{24} cm^{-2}, with a mean value of N_H\sim10^{23} cm^{-2}. Wediscuss and estimate how selection effects, such as those related to thelimited instrumental sensitivity at energies above 7keV, may hamper thedetection of even higher velocities and higher ionization absorbers. We arguethat, overall, these results point to the presence of extremely ionized andpossibly almost Compton thick outflowing material in the innermost regions ofAGNs. This also suggests that UFOs may potentially play a significant role inthe expected cosmological feedback from AGNs and their study can provideimportant clues on the connection between accretion disks, winds and jets.

Evidence for ultra-fast outflows in radio-quiet AGNs: II - detailed photo-ionization modeling of Fe K-shell absorption lines