Simulation Repository

The following simulation data are available to the community:

Number Box size Softening Mpart sigma8 h n
(Mpc/h) (kpc/h) (1e10 Msun/h)
1 300201.71.00.701.00
2 300201.70.80.701.00
3 128 90.10.90.700.95
4 256181.00.90.700.95
5 192130.40.80.671.00
The parameters of the simulations: All the simulations are of the Lambda CDM family with OmegaM = 0.3 = 1-Omega_Lambda. The simulations were started between z=50-100 and run to the present using the TreePM code [1] with output times spaced every O(100Mpc/h) from z~2. The force softening was of the spline form, held constant in comoving coordinates, and a ``Plummer equivalent'' smoothing is quoted in the 2nd column.

[1] M. White, ApJS 143(2002)241 [astro-ph/0207185]

The data represent dumps of the phase space coordinates of the particles at constant time of a simulation employing 512^3 particles in a periodic volume. The initial conditions were generated by displacing particles from a regular grid using the Zel'dovich approximation. The transfer function was taken to be the fit of Eisenstein & Hu with the baryon oscillations `smoothed' over.

For each output I ran a FoF group finder with a linking length of 0.15 times the mean interparticle spacing. All groups with fewer than 8 particles were assigned to the special group "0" which stands for "not in a group". Other groups were numbered from 1 to N with no particular correlation between group number and number of members.

Information on the file formats, endian conversions etc can be found in the AAREADME files in each subdirectory.

Martin White's Home Page.