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Originally Posted by Ari Jokimaki
Is this object black enough, so that we don't see them unless they are very close to us? I don't think we have seen this kind of objects, this is some kind of low redshift quasar, isn't it? Or is it regular galaxy nucleus you are talking about?
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These ‘black bodies’ are not dark, they are highly redshifted quasars, redshifted by their core density.
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Originally Posted by Ari Jokimaki
I just wonder if you can get enough velocity for these separating objects. Arp has reported ejection velocities of about 0.1c (but I don't know how speculative this is), so can you get so big velocity with your splitting process?
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This conversion of a huge portion of a galactic core that is light years acroos into radiant energy - yes, this could involve major league velocities in close proximity to the galaxy...initially, the separations would be highly Newtonian.
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If small mass means large redshift, why stars don't have huge redshifts? Why the Moon doesn't have z=10?
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Extremely dense, not small in mass. The idea is every galaxy contains a quasar-like high density redshift mass in the center. The more less-dense matter orbiting or infalling at increasing distances, the lower the redshift we observe for the entire structure.
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Originally Posted by Ari Jokimaki
You already described birth, but how death happens? Do galaxies just radiate themselves out of existence?
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That is a possibility, especially if the galaxy is not associated with a cluster (they may all be associated). When two galaxies are near enough that the do collide, we certainly have evidence they may form a single galaxy. It is possible all spiral galaxies are the result of galactic collisions - in Lee Davis's theory, bar galaxies are formed when to ellipticals collide and they eventually age into spirals.