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We report observations of a powerful ionized gas outflow in a z = 4.1luminous ($ L_{1.4GHz} \sim 10^{28.3} \ W \ Hz^{-1}$) radio galaxy TNJ1338-1942hosting an obscured quasar using the Near Infrared Spectrograph (NIRSpec) onboard JWST. We spatially resolve a large-scale (~15 kpc) outflow and measureresolved outflow rates. The outflowing gas shows velocities exceeding 900 $ km\ s^{-1}$ and broad line profiles with line widths exceeding 1200 $ km \s^{-1}$ located at ~10 kpc projected distance from the central nucleus. Theoutflowing nebula spatially overlaps with the brightest radio lobe, indicatingthat the powerful radio jets are responsible for the extraordinary kinematicsexhibited by the ionized gas. The ionized gas is possibly ionized by thecentral obscured quasar with a contribution from shocks. The spatially resolvedmass outflow rate shows that the region with the broadest line profilesexhibits the strongest outflow rates, with an integrated mass outflow rate of~500 $ M_{\odot} \ yr^{-1}$. Our hypothesis is that an over-pressured shockedjet fluid expands laterally to create an expanding ellipsoidal "cocoon" thatcauses the surrounding gas to accelerate outwards. The total kinetic energyinjected by the radio jet is about 3 orders of magnitude larger than the totalkinetic energy measured in the outflowing ionized gas. This implies thatkinetic energy must be transferred inefficiently from the jets to the gas. Thebulk of the deposited energy possibly lies in the form of hot (~$ 10^7$ K)X-ray-emitting gas.

JWST Reveals Powerful Feedback from Radio Jets in a Massive Galaxy at z = 4.1