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Originally Posted by Glutomoto
Maybe the SMBH and the Galaxzy formed together, or that is what a discovery science channel program said.
Actually the program, Supermassive Black Holes claimed they were sure that both formed together, due to the relation(ratio?) of the size of the SMBH and the rotational speed of the stars(the Sigma) of the host galaxzy.
If this relationship is true, would that mean that less or no, dark matter is needed to explain why galaxzies spin so fast for their size ?
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Doesn't change things much - the "canonical" relation is that the SMBH has about 1/200 of the mass found in stars in the surrounding bulge, so not a significant part of the required "dark" matter at all.
This new report is quite cool - there have been a few suggestions as to how an SMBH could be formed without slowly eating material from its surroundings within a galaxy, and those preprints will start to look much jmore relevant...