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Semi-analytic models of galaxy formation typically form the spheroidalcomponents of galaxies ("bulges"), solely through galactic major mergers.However, it is possible that non-merger events (e.g. a "fly-by" by a smallerhalo) can perturb a galaxy--halo system sufficiently to form a bulge. Wepresent a preliminary investigation into the frequency of major changes in haloand galaxy spin direction, which could be signatures of such events.

Spin Flips: Variation in the Orientation of Dark Matter Halos over their Merger Histories