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Motion of Dark Matter Subhalos

  1. Aug 2, 2011 #1
    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,
     
  2. jcsd
  3. Aug 2, 2011 #2
    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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