The Satellite-substructure Connection

Details The Satellite-substructure Connection The Satellite-substructure Connection

2003-11-28

arxiv.org/abs/astro-ph/0311631v1

Astronomy and Astrophysics

Astrophysics

4 pages, 5 figures, uses newpasp.sty; to be published in "Satellites and Tidal Streams" (ASP Conference Series), eds. F. Prada

Scientific paper

We describe our recent attempts to model substructure in dark matter halos down to very small masses, using a semi-analytic model of halo formation. The results suggest that numerical simulations of halo formation may still be missing substructure in the central regions of halos due to purely numerical effects. If confirmed, this central 'overmerging' problem will have important consequences for the interpretation of lensing measurements of substructure. We also show that the spatial distribution of subhalos relative to the satellite companions of the Milky Way rules out at least one simple model of how dwarf galaxies form in low-mass halos.

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