Higher Resolution Simulations in Smaller Boxes  

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Introduction: Formation and Evolution of Large Scale Stucture

Pic.1 This picture shows projected dark-matter distribution in four different model universes. It also shows the time evolution along horizontal sequence in each row. The cosmological parameters are the same as in the Virgo simulations for each model and the number of particles is also 2563, but the box size is smaller. Thus these simulations have higher mass resolution.

virgo models

Credit: Kauffmann, Colberg, Diaferio, and White, ref.1



Pic.2 Formation of Galaxy Clusters This picture shows the same cluster from the tCDM (left panel) and LCDM (right panel) model for redshifts of 2 (top), 1 (middle), and 0 (bottom). The simulations were run with the same phases of the intial density field but the sizes of the regions are different: 21x21x8 (Mpc/h)3 and 35x35x13 (Mpc/h)3 for tCDM and LCDM, respectively.

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formation of galaxy clusters

Credit: Kauffmann, Colberg, Diaferio, and White, ref.1

Simulation Parameters (2563 particles)top

Model Omega0 lambda h Gamma Sigma8 Npar L (Mpc/h) mp (M_sun/h) l_soft (Kpc/h)
SCDM 1.0 0.0 0.5 0.50 0.6 2563 84.5 1.0 x 1010 36
tCDM 1.0 0.0 0.5 0.21 0.6 2563 84.5 1.0 x 1010 36
LCDM 0.3 0.7 0.7 0.21 0.90 2563 141.3 1.4 x 1010 20
OCDM 0.3 0.0 0.7 0.21 0.85 2563 141.3 1.4 x 1010 30


Data Downloadtop

Available data

Snaphot outputs at 10 different redshifts for all the 4 models.
For the LCDM model additional outputs are available so that the output redshifts match those of the galaxy catalogues created by the GIF project.
The size of one compressed data file is approximately 210MB.

Select cosmological model and redshift


References top

Clustering of Galaxies in a Hierarchical Universe: I. Methods and Results at z=0, G. Kauffmann, J.M. Colberg, A. Diaferio, S.D.M. White, 1999, MNRAS, 303, 188-206, (Preprint astro-ph/9805283)

Credit top

Here is an example of proper credit for these Virgo data.
"The simulations in this paper were carried out by the Virgo Supercomputing Consortium using computers based at Computing Centre of the Max-Planck Society in Garching and at the Edinburgh Parallel Computing Centre. The data are publicly available at "

Comments to: Virgo Administrator virgo@mpa-garching.mpg.detop