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During the last years, Ly$\alpha$ nebulae have been routinely detected aroundhigh-z, radio-quiet quasars (RQQs) thanks to the advent of sensitive integralfield spectrographs. Constraining the physical properties of the Ly$\alpha$nebulae is crucial for a full understanding of the circum-galactic medium(CGM), which is a venue of feeding and feedback processes. The most luminousquasars are privileged test-beds to study these processes, given their largeionizing fluxes and dense CGM environments in which they are expected to beembedded. We aim at characterizing the rest-frame UV emission lines in the CGMaround a hyper-luminous, broad emission line, RQQ at z~3.6, that exhibitspowerful outflows at both nuclear and host galaxy scales. We analyze VLT/MUSEobservations of the quasar J1538+08 and perform a search for extended UVemission lines to characterize its morphology, emissivity, kinematics and metalcontent. We report the discovery of a very luminous ($\sim2\times10^{44}~erg~s^{-1}$), giant Ly$\alpha$ nebula and a likely associatedextended CIV nebula. The Ly$\alpha$ nebula emission exhibits moderate blueshiftcompared with the quasar systemic redshift and large average velocitydispersion ($\sigma_{v}$ ~700 $km~s^{-1}$) across the nebula, while the CIVnebula shows $\sigma_{v}$~$350~km~s^{-1}$. The Ly$\alpha$ line profile exhibitsa significant asymmetry towards negative velocity values at 20-30 kpc south ofthe quasar and is well parameterized by two Gaussian components: a narrow($\sigma$~$470~km~s^{-1}$) systemic one plus a broad ($\sigma$~1200$km~s^{-1}$), blueshifted (~1500 $km~s^{-1}$) one. Our analysis of the MUSEobservation of J1538+08 reveals metal-enriched CGM around this hyper-luminousquasar and our detection of blueshifted emission in the line profile of theLy$\alpha$ nebula suggests that powerful nuclear outflows can propagate throughthe CGM over tens of kpc.

The WISSH quasars project VII. Outflows and metals in the circumgalactic medium around the hyper-luminous z~3.6 quasar J1538+08