Radial migration and vertical action in N-body simulations
  We study the radial migration of stars as a function of orbital action as
well as the structural properties of a large suite of N-body simulations of
isolated disc galaxies. Our goal is to establish a relationship between the
radial migration efficiency of stars and their vertical action. We aim to
describe how that relationship depends on the relative gravitational dominance
between the disc and the dark matter halo. By changing the mass ratio of our
disc and dark matter halo we find a relationship between disc dominance, number
and strength of spiral arms, and the ensuing radial migration as a function of
the vertical action. We conclude that the importance of migration at large
vertical action depends on the strength of the spiral arms and therefore the
dominance of the disc. Populations with more radial action undergo less radial
migration, independently of disc dominance. Our results are important for the
future of analytical modelling of radial migration in galaxies and furthers the
understanding of radial migration which is a key component of the restructuring
of galaxies, including the Milky Way.
