Given how difficult that seems to be to find that kind of visual disturbance in a place like the galactic center where things are moving relatively fast, no way is a lone black hole going to be seen anywhere outside that kind of bee swarm of stars. But there certainly must be a lot of them, no reason to think there aren’t.
Reads over actual paper
I’m going to take your word for it.
Given how difficult that seems to be to find that kind of visual disturbance in a place like the galactic center where things are moving relatively fast, no way is a lone black hole going to be seen anywhere outside that kind of bee swarm of stars. But there certainly must be a lot of them, no reason to think there aren’t.