I'm familiar with those observations. Yes, there are stars at the center of our galaxy circling something, but what that something is, has only been guessed at. No object has been observed - only inferred.
It's not that modern cosmologists don't observe the various phenomena in the cosmos. They absolutely do, but they're relying on a dogmatic, hundred year old paradigm to explain those observations, which it cannot do.
As a consequence, they're forced to dream up ever more ludicrous wierdness to explain what they see. At some point they're going to have to question the validity of their underlying theories. They're not working, and haven't been for decades.
Dogma? No, they are relying on Gravity.