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Massive early-type galaxies commonly have gas discs which are kinematicallymisaligned with the stellar component. These discs feel a torque from the starsand the angular momentum vectors are expected to align quickly. We presentresults on the evolution of a misaligned gas disc in a cosmological simulationof a massive early-type galaxy from the Feedback In Realistic Environmentsproject. This galaxy experiences a merger which, together with a stronggalactic wind, removes most of the original gas disc. The galaxy subsequentlyreforms a gas disc through accretion of cold gas, but it is initially 120degrees misaligned with the stellar rotation axis. This misalignment persistsfor about 2 Gyr before the gas-star misalignment angle drops below 20 degrees.The time it takes for the gaseous and stellar components to align is muchlonger than previously thought, because the gas disc is accreting a significantamount of mass for about 1.5 Gyr after the merger, during which the angularmomentum change induced by accreted gas dominates over that induced by stellartorques. Once the gas accretion rate has decreased sufficiently, the gas discdecouples from the surrounding halo gas and realigns with the stellar componentin about 6 dynamical times. During the late evolution of the misaligned gasdisc, the centre aligns faster than the outskirts, resulting in a warped disc.We discuss the observational consequences of the long survival of ourmisaligned gas disc and how our results can be used to calibrate merger rateestimates from observed gas misalignments.

The creation and persistence of a misaligned gas disc in a simulated early-type galaxy