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We report high spatial resolution (~0.076", 410pc) Atacama LargeMillimeter/submillimeter Array imaging of the dust continuum and the ionizedcarbon line [CII] in a luminous quasar host galaxy at z=6.6, 800 million yearsafter the big bang. Based on previous studies, this galaxy hosts a ~1x10^9M_sun black hole and has a star-formation rate of ~1500 M_sun/yr. Theunprecedented high resolution of the observations reveals a complex morphologyof gas within 3kpc of the accreting central black hole. The gas has a highvelocity dispersion with little ordered motion along the line of sight, aswould be expected from gas accretion that has yet to settle in a disk. Inaddition, we find the presence of [CII] cavities in the gas distribution (withdiameters of ~0.5kpc), offset from the central black hole. This uniquedistribution and kinematics cannot be explained by a simple model. Plausiblescenarios are that the gas is located in a truncated or warped disk, or theholes are created by interactions with nearby galaxies or due to energyinjection into the gas. In the latter case, the energy required to form thecavities must originate from the central active galactic nucleus, as therequired energy far exceeds the energy output expected from supernovae. Thisenergy input into the gas, however, does not inhibit the high rate ofstar-formation. Both star-formation and black hole activity could have beentriggered by interactions with satellite galaxies; our data reveal threeadditional companions detected in [CII] emission around the quasar.

400 pc Imaging of a Massive Quasar Host Galaxy at a Redshift of 6.6