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We present Karl G Jansky Very Large Array (VLA) observations of CO(2-1) lineemission and rest-frame 250GHz continuum emission of the Hyper-Luminous IRGalaxies (HyLIRGs) BRI1202-0725 (z=4.69) and BRI1335-0417 (z=4.41), with anangular resolution as high as 0.15". Our low order CO observations delineatethe cool molecular gas, the fuel for star formation in the systems, inunprecedented detail. For BRI1202-0725, line emission is seen from both extremestarburst galaxies: the quasar host and the optically obscured submm galaxy(SMG), in addition to one of the Lyman-alpha emitting galaxies in the group.Line emission from the SMG shows an east-west extension of about 0.6". ForLyalpha-2, the CO emission is detected at the same velocity as [CII] and [NII],indicating a total gas mass ~4.0*10^10 solar masses. The CO emission fromBRI1335-0417 peaks at the nominal quasar position, with a prominent northernextension (~1", a possible tidal feature). The gas depletion timescales are~10^7 years for the three HyLIRGs, consistent with extreme starbursts, whilethat of Lyalpha-2 may be consistent with main sequence galaxies. We interpretthese sources as major star formation episodes in the formation of massivegalaxies and supermassive black holes (SMBHs) via gas rich mergers in the earlyUniverse.

New Constraints on the Molecular Gas in the Prototypical HyLIRGs BRI1202-0725 & BRI1335-0417