That is called a barycenter, the point where all mass of the galaxy orbits. Where it all balances out. Like two bodies on a seesaw, but rotary. It is also the point other galaxies balance with in relation to the Milky Way. It will shift a bit. Like an uneven wheel. Kind of a focal point and gateway to the rest of the universal mass and overall balance. The gas clouds will head to it.
Center of mass , aka: gravity and rotational captured barycenter between mass .....do not emit massive gamma ray bursts hundreds of light years long.