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We present rest-frame optical spectroscopy using JWST/NIRSpec IFU for theradio galaxy TN J1338-1942 at z=4.1, one of the most luminous galaxies in theearly Universe with powerful extended radio jets. Previous observations showedevidence for strong, large-scale outflows on the basis of its large (~150 kpc)halo detected in Ly-alpha, and high velocity [O II] emission features detectedin ground-based IFU data. Our NIRSpec/IFU observations spatially resolve theemission line properties across the host galaxy in great detail. We find atleast five concentrations of line emission, coinciding with discrete continuumfeatures previously detected in imaging from HST and JWST, over an extent of~2'' (~15 kpc). The spectral diagnostics enabled by NIRSpec unambiguously tracethe activity of the obscured AGN plus interaction between the interstellarmedium and the radio jet as the dominant mechanisms for the ionization stateand kinematics of the gas in the system. A secondary region of very highionization lies at roughly 5 kpc distance from the nucleus, and within thecontext of an expanding cocoon enveloping the radio lobe, this may be explainedby strong shock-ionization of the entrained gas. However, it could also signalthe presence of a second obscured AGN, which may also offer an explanation foran intriguing outflow feature seen perpendicular to the radio axis. Thepresence of a dual SMBH system in this galaxy would support that large galaxiesin the early Universe quickly accumulated their mass through the merging ofsmaller units (each with their own SMBH), at the centers of largeoverdensities. The inferred black hole mass to stellar mass ratio of 0.01-0.1for TNJ1338 points to a more rapid assembly of black holes compared to thestellar mass of galaxies at high redshifts, consistent with other recentobservations.

Widespread AGN feedback in a forming brightest cluster galaxy at $z=4.1$ unveiled by JWST