
It is believed that a second BH could be orbiting Sg A, and the detection of these HVB's (Hyper Velocity Binary) could provide the required evidence for the presence of a second BH.
Can have a look at this article, http://arxiv.org/abs/0810.3848
Every Friday at 10.30 we have donuts. We also talk about astronomy. Someone presents a paper, and we interupt and ask questions and think out loud and it's nice. Then we look at a couple of plots that people think are cool. Usually they are. These are those plots. Yes, we are massive nerds. And if you're still reading, then so are you. So there.

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