Speaker
Aaron Ludlow
(Argelander-Institut fuer Astronomie)
Description
I will discuss the relation between the accretion history and mass
profile of cold dark matter (CDM) haloes, emphasizing how an appropriate
definition of their formation times can be used to determine their
characteristic radii. This result is based on the finding that the
average mass accretion history, expressed in terms of the critical
density of the Universe, resembles the enclosed density profile, at any
redshift: both follow closely the Navarro, Frenk & White (NFW) profile.
This suggests that the self-similarity of halo mass profiles results
from the mass-independence of their accretion histories, an
interpretation which is supported by outliers whose mass profiles differ
substantially from the NFW form. Using these results I will present a
simple algorithm that can be used to predict the mass and redshift
dependence of dark matter halo concentrations for various cosmological
models
Author
Aaron Ludlow
(Argelander-Institut fuer Astronomie)
