Via The New Scientist:
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Something must have limited the growth of these black holes. Now Takamitsu Tanaka at the Max Planck Institute for Astrophysics in Garching, Germany, and colleagues have a climate-based explanation.
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Black holes need cool gas to grow so this would have slowed down the growth of other black holes in smaller protogalaxies, even as the growth of black holes in the most massive protogalaxies continued apace (arxiv.org/abs/1205.6467v1).
“This global warming process could have basically quenched the latecomers,” says Tanaka. “The early ones end up being the monsters and they prevent the overgrowth of the rest.”
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