this was a question in my mind and hence asking here to get the answer.
may be the black holes are continuously reducing since they are giving birth to the new stars ?

can black hole give birth to a big galaxy?

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Hi Suntrack


Stars are born when huge clouds of intersteller gas and dust collapse under their own weight and fragment into pieces.

http://astrosun2.astro.cornell.edu/a...star_birth.htm here is a link to a quick diagram on star birth

As far as i know, black holes do not have anything to do with star birth as such, but are tied in with the perhaps the formation of Galaxies, most of which (or all) have a Super Massive Black Hole at their centre.

And there is a strong (and as yet unexplained) correlation between the size of the black hole and the mass of the galaxy.

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Black holes aren't involved in star production. However, the supernovae that produce black holes are thought to be involved in triggering star formation. The shock wave from a supernova can compress gas clouds sufficiently to cause them to begin to collapse gravitationally.

Current theory suggests and observation supports the idea that many, if not all galaxies have a supermassive black hole (SMBH) at their centers. What isn't understood yet is whether the galaxy formed around the SMBH or whether the SMBH was born after the galaxy had formed.

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"A mystic is a person who is puzzled before the obvious but who understands the nonexistent." -- Elbert Hubbard

I did see a reasonable explanation in a paper a couple years ago. The relationship is that the SMBH has about a tenth of a percent the mass of the central bulge of the galaxy. The rationale is that the central bulge formed in the early history of the galaxy in much the way that globular clusters form. This involves inbound material getting blown radially away by the fierce radiation of a new central star, but that material which can form gravitationally bound bodies such as stars, brown dwarfs, and smaller objects, will continue to fall in, and a small percentage of these will get absorbed into the central object.

This is far from proved, but it IS a mainstream explanation.

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