We study the concentration parameters, their mass dependence and redshift evolution, of dark-matter halos in different dark-energy cosmologies with constant and time-variable equation of state, and compare them with ``standard'' ΛCDM and OCDM models. We find that previously proposed algorithms for predicting halo concentrations can be well adapted to dark-energy models. When centred on the analytically expected values, halo concentrations show a log-normal distribution with a uniform standard deviation of ˜0.2. The dependence of averaged halo concentrations on mass and redshift permits a simple fit of the form (1+z) c=c0 (M/M0)α, with α≈-0.1 throughout. We find that the cluster concentration depends on the dark energy equation of state at the cluster formation redshift zcoll through the linear growth factor D+(zcoll). As a simple correction accounting for dark-energy cosmologies, we propose scaling c0 from ΛCDM with the ratio of linear growth factors, c0-> c0 D+(zcoll)/D+, ΛCDM (zcoll).
|Titolo:||Numerical study of halo concentrations in dark-energy cosmologies|
|Autori:||Dolag, K.; Bartelmann, M.; Perrotta, F.; Baccigalupi, C.; Moscardini, L.; Meneghetti, M.; Tormen, G.|
|Data di pubblicazione:||2004|
|Digital Object Identifier (DOI):||10.1051/0004-6361:20031757|
|Appare nelle tipologie:||1.1 Journal article|