Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-29
Astron.Astrophys.416:853-864,2004
Astronomy and Astrophysics
Astrophysics
11 pages, submitted to Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20031757
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'' Lambda-CDM 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)^a, with a~-0.1 throughout. We find that the cluster concentration depends on the dark energy equation of state at the cluster formation redshift z_{coll} through the linear growth factor D_+(z_{coll}). As a simple correction accounting for dark-energy cosmologies, we propose scaling c0 from Lambda-CDM with the ratio of linear growth factors, c0 -> c0 D_+(z_{coll})/D_{+,Lambda-CDM}(z_{coll}).
Baccigalupi Carlo
Bartelmann Matthias
Dolag Klaus
Meneghetti Massimo
Moscardini Lauro
No associations
LandOfFree
Numerical study of halo concentrations in dark-energy cosmologies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Numerical study of halo concentrations in dark-energy cosmologies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Numerical study of halo concentrations in dark-energy cosmologies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-370453