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We present MUSE observations of the gas-rich major-merger BR1202-0725 atz~4.7, which constitutes one of the most overdense fields known in the earlyUniverse. We utilise these data in conjunction with existing ALMA observationsto compare and contrast the spatially resolved ionised- and cool-gas content ofthis system which hosts a quasar (QSO), a sub-millimeter galaxy (SMG), the twoknown optical companions ("LAE1", "LAE2"), and an additional companiondiscovered in this work "LAE3" just 5 arcsec to the North of the QSO. We findthat QSO BR1202-0725 exhibits a large Ly$\alpha$ halo, covering $\approx55$pkpc on-sky at surface brightness levels of SB$\geq$1E-17erg/s/cm$^2$/arcsec$^2$. In contrast, the SMG, of similar far-infraredluminosity and star formation rate (SFR), does not exhibit such a Ly$\alpha$halo. The QSO's halo exhibits high velocity widths ($\sim1000$ km/s) but thegas motion is to some extent kinematically coupled with the previously observed[CII] bridge between the QSO and the SMG. We note that the object known in theliterature as LAE2 shows no local peak of Ly$\alpha$ emission, rather, itsprofile is more consistent with being part of the QSO's extended Ly$\alpha$halo. The properties of LAE3 are typical of high-redshift LAEs; we measureF$_{\rm{Ly\alpha}}$(LAE3) = $0.24\pm$0.03E-16 erg/s/cm$^2$, corresponding toSFR$_{\rm{Ly\alpha}}\approx\ $5.0$\pm$0.5 M${_\odot}$/yr. The velocity width is$\Delta v$(LAE3) $\approx 400$ km/s, and equivalent widthEW$_0$(Ly$\alpha_{\,5\sigma}^{\,lim})\geq 34.05$ $\\A$, consistent with starformation being the primary driver of Ly$\alpha$ emission. We also note acoherent absorption feature at $\sim -400$km/s in spectra from at least threeobjects; the QSO, LAE1 and "LAE2" which could imply the presence of anexpanding neutral gas shell with an extent of at least $24$ pkpc.

The Ionised- and Cool-Gas Content of The BR1202-0725 System as seen by MUSE and ALMA