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Title:
The origin and tidal evolution of cuspy triaxial haloes
Authors:
Moore, Ben; Kazantzidis, Stelios; Diemand, Jürg; Stadel, Joachim
Affiliation:
AA(Institute for Theoretical Physics, University of Zürich, CH-8057 Zürich, Switzerland;), AB(Institute for Theoretical Physics, University of Zürich, CH-8057 Zürich, Switzerland;), AC(Institute for Theoretical Physics, University of Zürich, CH-8057 Zürich, Switzerland;), AD(Institute for Theoretical Physics, University of Zürich, CH-8057 Zürich, Switzerland;)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 354, Issue 2, pp. 522-528. (MNRAS Homepage)
Publication Date:
10/2004
Origin:
MNRAS
MNRAS Keywords:
methods: N-body simulations, galaxies: haloes, galaxies: interactions, cosmology: theory, dark matter
DOI:
10.1111/j.1365-2966.2004.08211.x
Bibliographic Code:
2004MNRAS.354..522M

Abstract

We present a technique for constructing equilibrium triaxial N-body haloes with nearly arbitrary density profiles, axial ratios and spin parameters. The method is based on the way in which structures form in hierarchical cosmological simulations, where prolate and oblate haloes form via mergers with low and high angular momentum, respectively. We show that major mergers between equilibrium spherical cuspy haloes produce similarly cuspy triaxial remnants and higher angular-momentum mergers produce systems with lower concentrations. Triaxial haloes orbiting within deeper potentials become more spherical and their velocity dispersion tensors more isotropic. The rate of mass loss depends sensitively on the halo shape: a prolate halo can lose mass at a rate several times higher than an isotropic spherical halo with the same density profile. Subhaloes within cosmological simulations are significantly rounder than field haloes with axial ratios that are ~30 per cent larger.

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