Andromeda 5x bigger than previously thought.

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Andromeda is now believed to be five times larger than previously estimated, raising questions about its structure and formation. Current galaxy formation theories suggest that the cores of galaxies like Andromeda contain more metal-rich stars due to processes such as star formation and supernovae, which enrich the central regions with metals. The idea that halo stars are drawn into the central black hole and contribute to star formation is a point of discussion, but it does not fully explain the presence of metals. Dark matter remains a crucial component in galaxy formation, influencing the gravitational dynamics and structure of galaxies like Andromeda. Understanding these processes is essential for a comprehensive view of galaxy evolution.
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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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