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Article overview
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Dark halo mergers and the formation of a universal profile | | D. Syer
; Simon D.M. White
; | | Date: |
8 Nov 1996 | | Subject: | astro-ph | | Affiliation: | MPA) and Simon D.M. White (MPA | | Abstract: | We argue that a universal density profile for dark matter halos arises as a natural consequence of hierarchical structure formation. It is a fixed point in the process of repeated mergers. We present analytic and numerical arguments for the emergence of a particular form of the profile. At small radii, the density should vary as $r^{-alpha}$, with $alpha$ determined by the way the characteristic density of halos scales with their mass. If small halos are dense, then $alpha$ is large. The mass-density relation can be related to the power spectrum of initial fluctuations, $P(k)$, through `formation time’ arguments. Early structure formation leads to steep cusps. For $P(k)sim k^n$ we find $alphasimeq 3(3+n)/(5+n)$. The universal profile is generated by tidal stripping of small halos as they merge with larger objects. | | Source: | arXiv, astro-ph/9611065 | | Services: | Forum | Review | PDF | Favorites | |
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