Reflex motion in the Milky Way stellar halo resulting from the Large
  Magellanic Cloud infall
  We present the results of N-body models of the Milky Way and Large Magellanic
Cloud system and study the kinematic reflex motion in the stellar halo owing to
the barycentre displacement of the disc. In agreement with previous studies, we
find that the Milky Way disc may be moving at 40 km/s relative to the
barycentre prior to the Large Magellanic Cloud infall. The resulting reflex
motion is visible in tangential velocities of the stellar halo as a simple
dipole. The signal is strongest for stars with long dynamical times,
identifiable in position-velocity data as stars with large apocentres, whose
dynamical memory is still well-represented by the unperturbed Milky Way
potential. The signal varies across the sky depending on the stellar tracer and
may 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 determinations
based on the modeling of stellar streams and/or smooth halo tracers such as
blue horizontal branch or RR Lyrae stars.
