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Recently, Widrow and collaborators announced the discovery of verticaldensity waves in the Milky Way disk. Here we investigate a scenario where thesewaves were induced by the Sagittarius dwarf galaxy as it plunged through theGalaxy. Using numerical simulations, we find that the Sagittarius impactproduces North-South asymmetries and vertical wave-like behavior thatqualitatively agrees with what is observed. The extent to which vertical modescan radially penetrate into the disc, as well as their amplitudes, depend onthe mass of the perturbing satellite. We show that the mean height of the discis expected to vary more rapidly in the radial than in the azimuthal direction.If the observed vertical density asymmetry is indeed caused by verticaloscillations, we predict radial and azimuthal variations of the mean verticalvelocity, correlating with the spatial structure. These variations can haveamplitudes as large as 8 km/s.

Vertical density waves in the Milky Way disc induced by the Sagittarius Dwarf Galaxy