Migration and heating in the galactic disc from encounters between Sagittarius and the Milky Way

Stars born on near-circular orbits in spiral galaxies can subsequently migrate to different due interactions with non-axisymmetric disturbances within the disc such as bars or arms. This paper extends study of migration examine role external influences using example interaction Sagittarius dwarf galaxy (Sgr) Milky Way (MW). We first make impulse approximation estimates characterize influence Sgr passages. The tidal forcing from produce changes both guiding radius ($\Delta R_g$) and orbital eccentricity, quantified by maximum radial excursion, $\Delta R_ {\rm max} $. These follow a quadrupole-like pattern across face disc, amplitude increasing Galactocentric radius. next collisionless N-body simulation Sgr-like satellite interacting MW-like find that Sgr's outer dominates over secular evolution between Finally, we use same explore possible observable signatures Sgr-induced painting age stellar populations. following passages, it induces manifests an annulus approximate quadrupole azimuthal metallicity variations ($\delta_ [Fe/H]} $), along systematic persist for several rotational periods. conclude this combination may be used distinguish mechanisms shaping chemical abundance patterns Way's thin disc.