Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-09-29
Astrophys.J. 529 (2000) L69-72
Astronomy and Astrophysics
Astrophysics
Final Version accepted for publication in ApJ (Letters); 11 pages with 3 figures included
Scientific paper
10.1086/312463
We perform a series of high-resolution N-body simulations designed to examine the density profiles of dark matter halos. From 12 simulated halos ranging the mass of $2\times10^{12}\sim 5\times10^{14} h^{-1}{\rm M_\odot}$ (represented by $\sim 1$ million particles within the virial radius), we find a clear systematic correlation between the halo mass and the slope of the density profile at 1% of the virial radius, in addition to the variations of the slope among halos of the similar mass. More specifically, the slope is $\sim -1.5$, -1.3, and -1.1 for galaxy, group, and cluster mass halos, respectively. While we confirm the earlier simulation results that the inner slope is steeper than the {\it universal} profile originally proposed by Navarro, Frenk & White, this mass dependence is inconsistent with the several analytical arguments attempting to link the inner slope with the primordial index of the fluctuation spectrum. Thus we conclude that the dark matter density profiles, especially in the inner region, are not universal.
Jing Yi-Peng
Suto Yasushi
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