Open AccessExtended Press–Schechter theory and the density profiles of dark matter haloes
Author(s) -
Hiotelis Nicos
Publication year - 2003
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2003.06803.x
Subject(s) - physics , halo , astrophysics , dark matter , cold dark matter , virial theorem , radius , dark matter halo , concentration parameter , accretion (finance) , structure formation , galaxy , quantum mechanics , computer security , computer science , boundary value problem , dirichlet distribution
An inside–out model for the formation of haloes in a hierarchical clustering scenario is studied. The method combines the picture of the spherical infall model and a modification of the extended Press–Schechter theory. The mass accretion rate of a halo is defined to be the rate of its mass increase due to minor mergers. The accreted mass is deposited at the outer shells without changing the density profile of the halo inside its current virial radius. We applied the method to a flat Λ‐cold dark matter universe. The resulting density profiles are compared with analytical models proposed in the literature, and a very good agreement is found. A trend is found of the inner density profile to become steeper for larger halo mass, which also results from recent N ‐body simulations. Additionally, present‐day concentrations as well as their time evolution are derived and it is shown that they reproduce the results of large cosmological N ‐body simulations.