Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-12-06
Mon.Not.Roy.Astron.Soc.373:1409-1415,2006
Astronomy and Astrophysics
Astrophysics
8 pages, 10 figures. Accepted to publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10868.x
We perform statistical analyses of the infall of dark-matter onto clusters in numerical simulations within the concordance LCDM model. By studying the infall profile around clusters of different mass, we find a linear relation between the maximum infall velocity and mass which reach 900km/s for the most massive groups. The maximum infall velocity and the group mass follow a suitable power law fit of the form, V_{inf}^{max} = (M/m_0)^{gamma}. By comparing the measured infall velocity to the linear infall model with an exponential cutoff introduced by Croft et al., we find that the best agreement is obtained for a critical overdensity delta_c = 45. We study the dependence of the direction of infall with respect to the cluster centres, and find that in the case of massive groups, the maximum alignment occurs at scales r ~ 6Mpc/h. We obtain a logarithmic power-law relation between the average infall angle and the group mass. We also study the dependence of the results on the local dark-matter density, finding a remarkable difference in the dynamical behaviour of low- and high-density particles.
Lambas Diego G.
Padilla Nelson D.
Pivato Maximiliano C.
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