Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-01-17
Astronomy and Astrophysics
Astrophysics
talk at the 4th RESCUE International Symposium on Birth and Evolution of the Universe, in press; 4 pages with 2 figures includ
Scientific paper
We report a series of high-resolution N-body simulations designed to examine the internal physical properties of dark matter halos. A total of fifteen halos, each represented by $\sim 1$ million particles within the virial radius, have been simulated covering the mass range of $2\times10^{12}\sim 5\times10^{14} h^{-1}{\rm M_\odot}$. As the first application of these simulations, we have examined the density profiles of the halos. We found a clear systematic correlation between the halo mass and the slope of the density profile at one percent 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. 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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