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Quasar-driven galactic outflows are a major driver of the evolution ofmassive galaxies. We report observations of a powerful galactic-scale outflowin a $z=3$ extremely red, intrinsically luminous ($L_{\rm bol}\simeq 5\times10^{47}$erg s$^{-1}$) quasar SDSSJ1652+1728 with the Near Infrared Spectrograph(NIRSpec) on board JWST. We analyze the kinematics of rest-frame opticalemission lines and identify the quasar-driven outflow extending out to $\sim10$ kpc from the quasar with a velocity offset of ($v_{r}=\pm 500$ km s$^{-1}$)and high velocity dispersion (FWHM$=700-2400$ km s$^{-1}$). Due to JWST'sunprecedented surface brightness sensitivity in the near-infrared -- weunambiguously show that the powerful high velocity outflow in an extremely redquasar (ERQ) encompasses a large swath of the host galaxy's interstellar medium(ISM). Using the kinematics and dynamics of optical emission lines, we estimatethe mass outflow rate -- in the warm ionized phase alone -- to be at least$2300\pm1400$ $M_{\odot}$ yr$^{-1}$. We measure a momentum flux ratio betweenthe outflow and the quasar accretion disk of $\sim$1 on kpc scale, indicatingthat the outflow was likely driven in a relatively high ($>10^{23}$cm$^{-2}$)column density environment through radiation pressure on dust grains. We find acoupling efficiency between the bolometric luminosity of the quasar and theoutflow of 0.1$\%$, matching the theoretical prediction of the minimum couplingefficiency necessary for negative quasar feedback. The outflow has sufficientenergetics to drive the observed turbulence seen in shocked regions of thequasar host galaxy, likely directly responsible for prolonging the time ittakes for gas to cool efficiently.

First results from the JWST Early Release Science Program Q3D: Powerful quasar-driven galactic scale outflow at $z=3$