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Spatially resolved observations of AGN host galaxies undergoing feedbackprocesses are one of the most relevant avenues through which galactic evolutioncan be studied, given the long lasting effects AGN feedback has on gasreservoirs, star formation, and AGN environments at all scales. Within thiscontext we report results from VLT/MUSE integral field optical spectroscopy ofTN J1049-1258, one of the most powerful radio sources known, at a redshift of3.7. We detected extended ($\sim$ 18 kpc) Lyman $\alpha$ emission, spatiallyaligned with the radio axis, redshifted by 2250 $\pm$ 60 km s$^{-1}$ withrespect to the host galaxy systemic velocity, and co-spatial with UV continuumemission. This Lyman $\alpha$ emission could arise from a companion galaxy,although there are arguments against this interpretation. Alternatively, itmight correspond to an outflow of ionized gas stemming from the radio galaxy.The outflow would be the highest redshift spatially resolved ionized outflow todate. The enormous amount of energy injected, however, appears to be unable toquench the host galaxy's prodigious star formation, occurring at a rate of$\sim$4500 M$_{\odot} yr^{-1}$, estimated using its far infra-red luminosity.Within the field we also found two companion galaxies at projected distances of$\sim$25 kpc and $\sim$60 kpc from the host, which suggests the host galaxy isharbored within a protocluster.

An extended Lyman $\alpha$ outflow from a radio galaxy at z=3.7?