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Active galactic nuclei (AGN) feedback operated by the expansion of radio jetscan play a crucial role in driving gaseous outflows on galaxy scales. Galaxieshosting young radio AGN, whose jets are in the first phases of expansionthrough the surrounding interstellar medium (ISM), are the ideal targets toprobe the energetic significance of this mechanism. In this paper, wecharacterise the warm ionised gas outflows in a sample of nine young radiosources from the 2Jy sample, combining X-shooter spectroscopy and Hubble SpaceTelescope (HST) imaging data. We find that the warm outflows have similarradial extents (~0.06-2 kpc) as radio sources, consistent with the idea that`jet mode' AGN feedback is the dominant driver of the outflows detected inyoung radio galaxies. Exploiting the broad spectral coverage of the X-shooterdata, we have used the ratios of trans-auroral emission lines of [SII] and[OII] to estimate the electron densities, finding that most of the outflowshave gas densities ($\log( n_e~cm^{-3})~3-4.8 $), which we speculate could bethe result of compression by jet-induced shocks. Combining our estimates of theemission-line luminosities, radii, and densities, we find that the kineticpowers of the warm outflows are a relatively small fraction of the energiesavailable from the accretion of material onto the central supermassive blackhole (SMBH), reflecting AGN feedback efficiencies below 1% in most cases.Overall, the warm outflows detected in our sample are strikingly similar tothose found in nearby ultraluminous infrared galaxies (ULIRGs), but moreenergetic and with a high feedback efficiencies on average than the generalpopulation of nearby AGN of similar bolometric luminosity; this is likely toreflect a high degree of coupling between the jets and the near-nuclear ISM inthe early stages of radio source evolution.

AGN-driven outflows and the AGN feedback efficiency in young radio galaxies