When considering the speed of objects revolving around a galactic boundary and the gravitational confluence at the center of the galaxy, it would appear that all objects would be spiraling toward the center. If an object is spiraling toward that center, then it would appear that light from these objects would experience a red shift as the object would have a relative motion away from any external static frame. What is interesting is that the motion toward the center should cause a red shift from any observable direction except parallel to the axis of rotation. Additionally the observer's field of vision should encompass a larger field of red shift on the near side of the galaxy and the blue shift should encompass a larger field on the far side of the galaxy. The farther away a galaxy the more this shift should be observable. Does anyone know a reference or simply know if this occurs and how the compensation is made when measuring the expansion of space?