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quasar

Silk and Rees

bizarrely

the sigma

With only its hot whirling quasar within its reach, the black hole would swallow that up and then stop feeding. It would be left invisible at the center of the galaxy. Silk and Rees calculated that this moment when the black hole pushed the surrounding galaxy away would depend bizarrely on how fast the stars in the outer galaxy were moving. The faster these stars were circling, the harder it would be to push them away and the bigger the black hole would need to grow to produce enough energy to overcome the motion of the circling stars, which means the size of the black hole in the end depends on how fast the stars are moving in the newly formed galaxy around it.
If our theory is correct, there should be a simple relation between the mass of the central black hole and the speed or the sigma of the stars in the newly formed surrounding galaxy.
And this is exactly what has just been found.

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