Theoretical dark matter halo kinematics and triaxial shape

2011/04/30 by Eduard Salvador-Solé, Sinue Serra, Alberto Manrique +2
Physics and Astronomy · #Anisotropy #Astrophysics #Bispectrum #Classical mechanics #Cosmology #Cosmology and Gravitation Theories #Cuspy halo problem #Dark Matter and Cosmic Phenomena #Dark matter #Dark matter halo #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gaussian #Halo #Kinematics #Phase space #Physics #Power law #Quantum mechanics #Spectral density #astro-ph.CO

paper · pdf · doi:10.1111/j.1365-2966.2012.21475.x

published as 2012, MNRAS, 424, 3129 · 18 pages, 6 figures. Published in MNRAS

openalex publication_date 2012/07/13 · arxiv created 2012/09/12 · arxiv updated 2012/09/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

In a recent paper, Salvador-Solé et al. have derived the typical inner structure of dark matter haloes from that of peaks in the initial random Gaussian density field, determined by the power spectrum of density perturbations characterizing the hierarchical cosmology under consideration. In this 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. The trends of the predicted typical halo shape, pseudo-phase-space density and anisotropy profiles are in good agreement with the results of numerical simulations. Our model sheds light on the origin of the power-law-like pseudo-phase-space density profile for virialized haloes.

Citations

• On the Formation and Evolution of Disk Galaxies: Cosmological Initial Conditions and the Gravitational Collapse
• SHAPES OF DARK MATTER HALOS
• Mass growth and density profiles of dark matter haloes in hierarchical clustering
• The spin and shape of dark matter haloes in the Millennium simulation of a Λ cold dark matter universe
• The Phase‐Space Density Profiles of Cold Dark Matter Halos