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Keck OSIRIS/LGSAO observations of the ultraluminous galaxy IRAS~23365+3604resolve a circumnuclear bar (or irregular disk) of semimajor axis 0.42" (520pc) in Paschen-alpha emission. The line-of-sight velocity of the ionized gasincreases from the northeast toward the southwest; this gradient isperpendicular to the photometric major axis of the infrared emission. Two pairsof bends in the zero-velocity line are detected. The inner bend providesevidence for gas inflow onto the circumnuclear disk/bar structure. We interpretthe gas kinematics on kiloparsec scales in relation to the molecular gas diskand multiphase outflow discovered previously. In particular, the fast componentof the outflow (detected previously in line wings) is not detected, addingsupport to the conjecture that the fast wind originates well beyond thenucleus. These data directly show the dynamics of gas inflow and outflow in thecentral kiloparsec of a late-stage, gas-rich merger and demonstrate thepotential of integral field spectroscopy to improve our understanding of therole of gas flows during the growth phase of bulges and supermassive blackholes.

Resolving Gas Flows in the Ultraluminous Starburst IRAS23365+3604 with Keck LGSAO/OSIRIS