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We present the results of N-body models of the Milky Way and Large MagellanicCloud system and study the kinematic reflex motion in the stellar halo owing tothe barycentre displacement of the disc. In agreement with previous studies, wefind that the Milky Way disc may be moving at 40 km/s relative to thebarycentre prior to the Large Magellanic Cloud infall. The resulting reflexmotion is visible in tangential velocities of the stellar halo as a simpledipole. The signal is strongest for stars with long dynamical times,identifiable in position-velocity data as stars with large apocentres, whosedynamical memory is still well-represented by the unperturbed Milky Waypotential. The signal varies across the sky depending on the stellar tracer andmay be up to the same magnitude as the velocity of the disc centre-of-mass,making reflex motion a source of bias for Milky Way potential determinationsbased on the modeling of stellar streams and/or smooth halo tracers such asblue horizontal branch or RR Lyrae stars.

Reflex motion in the Milky Way stellar halo resulting from the Large Magellanic Cloud infall