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Stardate.org said:... Astronomers have devised two theories to explain this relationship.
The first theory says that in the very early universe, galaxies were all fairly small, and they were born with black holes equal to 0.15 percent of their mass. These galaxy fragments quickly merged to form bigger galaxies. As they did, the black holes in their cores merged, too, maintaining the ratio of black-hole mass to the mass of all the gas and stars.
The second theory says that the black holes started relatively small, then grew as the galaxies formed around them. However, the process that increases the size of the black hole releases copius amounts of energy back into the galaxy. This energy interacts with the galaxy to regulate the galaxy's ability to make stars. The energy release also shuts off the black hole's own fuel supply by pushing away the surrounding clouds of gas and dust.
In other words, at a specific ratio of black-hole mass to galaxy mass, the black hole effectively stops both the galaxy and itself from getting any larger. This remarkable process happens when that ratio is 0.15 percent.
Observations and computer simulations made over the last decade seem to favor the second explanation. ...
http://blackholes.stardate.org/resources/articles/article.php?id=9 [Broken]
This presupposes that dark matter and dark energy interactions play no role?
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