. . . . . "\u00A9 ESO 2021" . . . . . "2021"^^ . "2021"^^ . "aa41558-21" . . . . . . . "In this paper we present Multi Unit Spectroscopic Explorer integral field unit spectroscopic observations of the \u223C70\u2005\u00D7\u200530 kpc 2 Ly \u03B1 halo around the radio galaxy 4C04.11 at z\u2004=\u20044.5077. High-redshift radio galaxies are hosted by some of the most massive galaxies known at any redshift and are unique markers of concomitant powerful active galactic nucleus (AGN) activity and star formation episodes. We map the emission and kinematics of the Ly \u03B1 across the halo as well as the kinematics and column densities of eight H\u202F I absorbing systems at \u22123500\u2004<\u2004\u0394 v\u2004<\u20040 km s \u22121. We find that the strong absorber at \u0394 v\u2004\u223C\u20040 km s \u22121 has a high areal coverage (30\u2005\u00D7\u200530 kpc 2), being detected across a large extent of the Ly \u03B1 halo, a significant column density gradient along the southwest to northeast direction, and a velocity gradient along the radio jet axis. We propose that the absorbing structure, which is also seen in C\u202F IV and N\u202F V absorption, represents an outflowing metal-enriched shell driven by a previous AGN or star formation episode within the galaxy and is now caught up by the radio jet, leading to jet-gas interactions. These observations provide evidence that feedback from AGN in some of the most massive galaxies in the early Universe may play an important role in redistributing material and metals in their environments."@en . . . . . . . "ESO" . . . . . . . . . "Mapping the \u201Cinvisible\u201D circumgalactic medium around a z \u223C 4.5 radio galaxy with MUSE"@en . . . . .