Evolution of the Cluster Mass Function: Gpc^3 Dark Matter Simulations

Details Evolution of the Cluster Mass Function: Gpc^3 Dark Matter Simulations Evolution of the Cluster Mass Function: Gpc^3 Dark Matter Simulations

2000-11-21

arxiv.org/abs/astro-ph/0011376v2

Astrophys.J. 551 (2001) 15-22

Astronomy and Astrophysics

Astrophysics

12 pages including 10 figures; matches published version

Scientific paper

10.1086/320077

High-resolution N-body simulations of four popular Cold Dark Matter cosmologies (LCDM, OCDM, QCDM, and tilted SCDM), each containing 10^5 clusters of galaxies in a cubic gigaparsec volume, are used to determine the evolution of the cluster mass function from z=3 to z=0. The large volume and high resolution of these simulations allow an accurate measure of the evolution of cosmologically important (but rare) massive clusters at high redshift. The simulated mass function is presented for cluster masses within several radii typically used observationally (R=0.5, 1.0, and 1.5 Mpc/h, both comoving and physical) in order to enable direct comparison with current and future observations. The simulated evolution is compared with current observations of massive clusters at redshifts 0.30.3 and no massive clusters at z>0.5, in stark contradiction with observations. The Omega_m=0.3 models- LCDM, OCDM, and QCDM- all exhibit considerably weaker evolution and are consistent with current data. Among these low density models, OCDM evolves the least. These trends are enhanced at high redshift and can be used to discriminate between flat and open low density models. The simulated mass functions are compared with the Press-Schechter approximation. Standard Press-Schechter predicts too many low mass clusters at z=0, and too few clusters at higher redshift. We modify the approximation by a simple parameterization of the density contrast threshold for collapse, which has a redshift dependence. This modified Press-Schechter approximation provides a good fit to the simulated mass functions.

Affiliated with

Also associated with

No associations

Rating

Evolution of the Cluster Mass Function: Gpc^3 Dark Matter Simulations 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 Evolution of the Cluster Mass Function: Gpc^3 Dark Matter Simulations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evolution of the Cluster Mass Function: Gpc^3 Dark Matter Simulations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-590647