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Silk

impact on

quasar

snowplough

Silk realized that the energy from this newly formed quasar would create intense temperature changes in the surrounding gas. This would cause the gas around the black hole and its newly formed quasar to condense into stars, which means, in effect, that the black hole could have helped to trigger the birth of the galaxy.
We think of black holes normally as being destructive influences on their surroundings. In this case they're creative, they're having a very positive impact on the formation of the galaxies.
But there was more. This theory predicted when and why the black hole would eventually stop feeding and go quiet. They calculated that this would happen when the feeding black hole grew so large that the vast amount of energy spewing from its bright quasar would literally force the rest of the galaxy out of its reach.
It has the effect of pushing in a wind against the surrounding gas and driving the surrounding gas away like a snowplough?

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