1301.7157 (Hector Aceves et al.)

Intragroup dark matter distribution in small galaxy group-like systems in a LCDM cosmology    [PDF]

Hector Aceves, F. J. Tamayo, L. Altamirano-Devora, F. G. Ramon-Fox, R. Cañas

In this paper we study the distribution of dark matter in small galaxy groups, in a LCDM cosmology, identified using a physical criterion. We quantify the amount of intra-group dark matter and characterize its distribution. We find that compact associations of galaxies, as well as those intermediate and loose groups, have a rather flat profiles with a logarithmic slope of gamma =-0.2. Hence, the intra-group dark matter does not follow the same cuspy tendency that haloes of galaxies have. In intermediate and loose galaxy associations the intragroup matter tends to be <50% that of the total mass of the group, and in compact associations is <20% within their group radius. So, in general, common dark matter haloes of small galaxy groups are not cuspy nor massive.

View original: http://arxiv.org/abs/1301.7157