Apparently this is very new science, the information is still being collected as cutting edge research. One thing that is clear is that the intergalactic mediu

Apparently this is very new science, the information is still being collected as cutting edge research. One thing that is clear is that the intergalactic medium has a highly variable density. In the vicinity of a recent galactic merger or near-miss, there would be a smear of stars fading off into the distance. Conversely, even a fairly quiet and passive galaxy like our own is expected to eject stars at a rate of one every few hundred years from the core region immediately nearby the black hole there.