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We present further analysis of the [CII] 158$\mu$m fine structure line andthermal dust continuum emission from the archetype extreme starburst/AGN groupof galaxies in the early Universe, BRI 1202-0725 at $z=4.7$, using the AtacamaLarge Millimeter Array. The group is long noted for having a closely separated(26kpc in projection) FIR-hyperluminous quasar host galaxy and an opticallyobscured submm galaxy (SMG). A short ALMA test observation reveals a richlaboratory for the study of the myriad processes involved in clustered massivegalaxy formation in the early Universe. Strong [CII] emission from the SMG andthe quasar have been reported earlier by Wagg et al. (2012) based on theseobservations. In this letter, we examine in more detail the imaging resultsfrom the ALMA observations, including velocity channel images,position-velocity plots, and line moment images. We present detections of [CII]emission from two Ly$\alpha$-selected galaxies in the group, demonstrating therelative ease with which ALMA can detect the [CII] emission from lower starformation rate galaxies at high redshift. Imaging of the [CII] emission shows aclear velocity gradient across the SMG, possibly indicating rotation or a morecomplex dynamical system on a scale $\sim 10$kpc. There is evidence in thequasar spectrum and images for a possible outflow toward the southwest, as wellas more extended emission (a 'bridge'), between the quasar and the SMG,although the latter could simply be emission from Ly$\alpha$-1 blending withthat of the quasar at the limited spatial resolution of the currentobservations. These results provide an unprecedented view of a major merger ofgas rich galaxies driving extreme starbursts and AGN accretion during theformation of massive galaxies and supermassive black holes within 1.3 Gyr ofthe Big Bang.

The anatomy of an extreme starburst within 1.3Gyr of the Big Bang revealed by ALMA