The Mass of Virialized Dark Matter Haloes

Details The Mass of Virialized Dark Matter Haloes The Mass of Virialized Dark Matter Haloes

2008-03-31

arxiv.org/abs/0804.0024v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure, to be published in the ASPCS Proceedings of the 1st Subaru International Conference "Panoramic Views of Gal

Scientific paper

Virial mass is used as an estimator for the mass of a dark matter halo. However, the commonly used constant overdensity criterion does not reflect the dynamical structure of haloes. Here we analyze dark matter cosmological simulations in order to obtain properties of haloes of different masses focusing on the size of the region with zero mean radial velocity. Dark matter inside this region is stationary, and thus the mass of this region is a much better approximation for the virial mass.

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