Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-09-05
Astrophys.J.499:L5,1998
Astronomy and Astrophysics
Astrophysics
Final version, to be published in the ApJLetters
Scientific paper
10.1086/311333
We examine the effects of mass resolution and force softening on the density profiles of cold dark matter halos that form within cosmological N-body simulations. As we increase the mass and force resolution, we resolve progenitor halos that collapse at higher redshifts and have very high densities. At our highest resolution we have nearly 3 million particles within the virial radius, several orders of magnitude more than previously used and we can resolve more than one thousand surviving dark matter halos within this single virialised system. The halo profiles become steeper in the central regions and we may not have achieved convergence to a unique slope within the inner 10% of the virialised region. Results from two very high resolution halo simulations yield steep inner density profiles, $\rho(r)\sim r^{-1.4}$. The abundance and properties of arcs formed within this potential will be different from calculations based on lower resolution simulations. The kinematics of disks within such a steep potential may prove problematic for the CDM model when compared with the observed properties of halos on galactic scales.
Governato Fabio
Lake George
Moore Ben
Quinn Tom
Stadel Joachim
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