Is the Motion of Dark Matter Subhalos Random or Patterned?

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The motion of dark matter subhalos within host halos is uncertain, with ongoing debates about whether their movement is random or follows a specific pattern. The nature of dark matter itself remains unclear, complicating the understanding of subhalo dynamics. Factors such as density waves from galaxy spiral arms and supernova blasts may influence the behavior of dark matter. Additionally, the existence of structures like the Local Bubble could create voids affecting dark matter distribution. Overall, the question of whether subhalo motion is random or patterned is still open for exploration.
kadiliissaar
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Hi,

I know that within the host halo there are smaller subhalos moving around. I was swondering that is their motion just random motion or does it follow some kind of pattern, e.g. circular motion centred at the centre of the dark matter halo?

Thanks,
 
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This is a very good question to which, IMHO, there is not yet a clear answer. Given that we don't yet know exactly what 'Dark Matter' is, or even if there really is 'Dark Matter' rather than some non-Newtonian factor, it is hard to say.

IMHO, assuming generic 'Dark Matter', a lot depends on its sensitivity to 'density waves'. Will it be concentrated by a galaxy's spiral arms ? Will it be 'blown along' by a supernova's blast ?? Are we in a Dark Matter 'void' thanks to the 'Local Bubble' ??
http://en.wikipedia.org/wiki/Local_Bubble
 

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