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Some questions about dark matter

Eldad Eshel
in Physics

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Does dark matter surround a galaxy in a sphere shape ? Does this sphere have a constant density ? Or a changing one, like less and less dark matter towards the outer rim of the sphere ?

Does dark matter surround a galaxy in a sphere shape ? Does this sphere have a constant density ? Or a changing one, like less and less dark matter towards the outer rim of the sphere ?

 

 

It is spherical. The density is higher towards the centre. (Sadly, I have never been able to track down a graph showing the density distribution.)

https://en.wikipedia.org/wiki/Navarro–Frenk–White_profile

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