Black hole growth found to be out of sync
Astronomers long have thought that a supermassive black hole and the bulge of stars at the center of its host galaxy grow at the same rate -- the bigger the bulge, the bigger the black hole.
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“Geologist [I'm Climate Change]”
Since: Mar 07
#1 Jun 13, 2012
Another interesting one.
There have also been reports of supermassive black holes being remarkably small compared to the host galaxy (NGC 5128 for example being host to a 100 million solar mass example rather than the 1000 million solar mass black hole its size & activity would suggest.
NGC 5128 appears (despite descriptions) to be a single galaxy rather then a merger remnant (as evidenced by its rapid precession rate and recycling of its jets into an equatorial inflow).
The galaxies with much larger black holes than average may be a small elliptical merger remnant which has since had a disc condense onto it. Another mechanism for black hole overgrowth could be the black hole rotating in thre opposite direction to the disc, resulting in magnetic braking and rapid inflow of gas onto the black hole via the black hole's associated drag & spin disc.
Worthwhile seeng what the neighbourhood of the galaxies looks like. They should be the largest or near largest objects of the group if they began as merger remnants.
have a nice day: Ag
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