On the Mass Dependence of the Inner Slopes of Dark Matter Density Profiles

Baltic astronomy

article

A. Del Popolo¹ 

[1] Dipartimento di Fisica e Astronomia;International Institute of Physics, Universidade Federal do Rio Grande do Norte

关键词: cosmology theory;    large-scale structure of Universe;    galaxies formation;   

DOI  :  10.1515/astro-2017-0172

来源: Institute of Theoretical Physics and Astronomy

【 摘 要 】

We study through a semi-analytic model how the inner slopes of relaxed ΛCDM dark matter halos with and without baryons depend on the halo mass. We find that the inner logarithmic density slope, α ≡ d log ρ/d log r , of dark matter halos with baryons has a significant dependence on the halo mass with slopes ranging from α ≃ 0 for dwarf galaxies to ≃ 1 for clusters of galaxies. In the case of density profiles constituted just of dark matter, the mass dependence of slope is very slight. In the presence of baryons, the universality of the dark matter density profiles is no longer valid, in agreement with the results of several other authors, including the recent Di Cintio et al. (2014) simulations.

【 授权许可】

Unknown