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. 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→c0D+(zcoll)/D+,ΛCDM(zcoll).
Titolo: | Properties of Galaxy Clusters in Cosmologies with Dark Energy |
Autori: | Dolag, K.; Bartelmann, M.; Moscardini, L.; Perrotta, F.; Baccigalupi, C.; Meneghetti, M.; Tormen, G. |
Rivista: | |
Data di pubblicazione: | 2004 |
Volume: | 19 |
Fascicolo: | 13-16 |
Pagina iniziale: | 1079 |
Pagina finale: | 1082 |
Digital Object Identifier (DOI): | 10.1142/S0217732304014392 |
Appare nelle tipologie: | 1.1 Journal article |
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