Comment Fascinating! (Score 1) 31
Now, yes, there are predictions that you could get a supermassive black hole launched into space, especially during a galaxy merger if the velocity of the smaller black hole exceeds the escape velocity of the combined galaxy.
But I'd be wary of assuming that it's a launched black hole, unless we can find the merger it comes from. There may be ways for such a black hole to form that cause the stars to be launched away rather than the black hole being flung, and if a galaxy isn't rotating fast enough to be stable, one could imagine that a sufficiently small galaxy was simply consumed by its central black hole. Both of these would seem to produce exactly the same outcome, if all we have is the black hole itself and a velocity.
I'm not going to say either of these is likely in this case, or that astronomers haven't examine them (they almost certainly have), but rather that we should be cautious until we've a clearer idea of what the astronomers have actually been able to determine or rule out.