What physical disturbances are mapped in the Milky Way's main disk caused by the Sgr Dwarf cannibalism?

Ripples or waves propagating outward, especially pronounced in the gaseous layer.

The ongoing process of the Sagittarius Dwarf Galaxy being absorbed by the Milky Way is dynamic and violent, analogous to dropping a large object into a still pond. This action generates significant physical disturbances within the host galaxy's primary structure, the stellar and gaseous disk. Specifically, these disturbances manifest as ripples or waves that propagate outward from the point of interaction. Observations have shown that these gravitational disturbances are particularly noticeable and well-defined within the layer composed of gas in the Milky Way disk, which is directly relevant to the theory of star formation initiation.