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Article dans une revue

Evolution of the phase-space density of dark matter haloes and mixing effects in merger events

Abstract : Cosmological N-body simulations were performed to study the evolution of the phase-space density Q = ρ/σ 3 of dark matter haloes. No significant differences in the scale relations Q ∝ σ −2.1 or Q ∝ M −0.82 are seen for the 'cold' or 'warm' dark matter models. The follow-up of individual haloes from z = 10 up to the present time indicate the existence of two main evolutionary phases: an early and fast one (10 > z > 6.5), in which Q decreases on the average by a factor of 40 as a consequence of the randomization of bulk motions, and a late and long one (6.5 > z 0), in which Q decreases by a factor of 20 because of mixing induced by merger events. The study of these haloes has also evidenced that rapid and positive variations of the velocity dispersion, induced by merger episodes, are related to a fast decrease of the phase-space density Q.
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https://hal.archives-ouvertes.fr/hal-00388639
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Soumis le : mardi 26 janvier 2021 - 11:58:42
Dernière modification le : mardi 26 janvier 2021 - 11:59:00

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S. Peirani, F. Durier, J.A. de Freitas Pacheco. Evolution of the phase-space density of dark matter haloes and mixing effects in merger events. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2006, 367, pp.1011-1016. ⟨10.1111/j.1365-2966.2006.10149.x⟩. ⟨hal-00388639⟩

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