Theoretical dark matter halo kinematics and triaxial shape

Details Theoretical dark matter halo kinematics and triaxial shape Theoretical dark matter halo kinematics and triaxial shape

2011-04-14

arxiv.org/abs/1104.2905v3

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

17 pages, 6 figures. Submitted to MNRAS

Scientific paper

In a recent paper, Salvador-Sol\'e et al. (2012) have derived the typical inner structure of dark matter haloes from that of peaks in the initial random Gaussian density field, determined in turn by the power-spectrum of density perturbations characterising the hierarchical cosmology under consideration. In the present paper, we extend this formalism to the typical kinematics and triaxial shape of haloes. Specifically, we establish the link between such halo properties and the power-spectrum of density perturbations through the typical shape of peaks. We show that the results obtained hold for all haloes, regardless of their aggregation history. The predicted trends in the typical halo shape, pseudo phase-space density and anisotropy profiles are in good agreement with the results of numerical simulations. These results shed light on the origin of the power-law-like pseudo phase-space density profile for virialised haloes.

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