Andromeda 5x bigger than previously thought.

The article from space.com:
http://www.space.com/scienceastronomy/070107_andromeda_halo.html



I have a question about the article. What do current galaxy formation theories say about why the cores of galaxies like Andromeda have more metal-rich stars than their halos do? I am guessing that the halo stars slowly get drawn into Andromeda's central black hole and as a result, they coalesce into stars that are then capable of the fusion reactions and eventually the supernovae that are capable of creating metals, is this close?
 
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So does it still need any dark matter?
 

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