Bolshoi

Slice of Bolshoi. More images

The Bolshoi simulation (from Russian “big”) has a simulation volume of (250 Mpc/h) 3 and a mass resolution of 1.35 * 108 Msun/h, which is more than a factor of 6 better than the mass resolution of the Millennium simulation. Its details are described in Klypin, Trujillo-Gomez & Primack 2010, some more information and images can be found at the Bolshoi simulation homepage. The main properties and cosmological parameters are listed in the table below; it uses the same WMAP5 cosmology as the MultiDark simulation MDR1, also see Simulations for an overview of all available and planned cosmological simulations.

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Details

Box size 250 Mpc/h side length of the cosmological cube
Number of particles 20483 total number of dark matter particles
Mass resolution 1.35 * 108 Msun/h mass of one dark matter particle
Force resolution 1.0 kpc/h physical force resolution
Initial redshift 80 redshift at which the simulation started
Cosmology
h 0.70 Hubble parameter
ΩΛ 0.73 density parameter for dark energy
Ωm 0.27 density parameter for matter (dark matter+baryons)
Ωb 0.0469 density parameter for baryonic matter
n 0.95 normalization of the Power spectrum
σ8 0.82 amplitude of mass density fluctuation in 8 Mpc/h sphere (at redshift z=0)

 

Bolshoi data in the database

The following table provides an overview on the database tables which are available for this simulation. For each table, a link to its “table type” is given, which leads to a page explaining the individual columns of the corresponding table in more detail.

Several tables may contain a Peano-Hilbert key (phkey) for each row, which can be constructed from the position using the hilbert key function. If not indicated otherwise, the hilbert order for this simulation is 10, i.e. there are 210 = 1024 cells per dimension.

Database table Table type Short description
BDMV BDM BDM (Bound Density Maximum) catalogue for all available snapshots, calculated using the standard overdensity criterion with 360*ρback (background density).
bdmId = ( snapnum*108 +(number in BDM catalogue) )
BDMVProf BDMProf Halo profiles of the BDMV catalogue for all available snapshots, calculated using the standard overdensity criterion with 360*ρback (background density).
BDMW BDM BDM catalogue for all available snapshots, calculated using 200*ρcrit (critical density) for defining the halo boundary.
BDMWProf BDMProf Halo profiles of the BDMW catalogue for all available snapshots, calculated using 200*ρcrit (critical density) for defining the halo boundary.
Dens256_z0 Dens Density field for redshift 0, for 2563 grid cells; strongly smoothed
Dens256 Dens Density fields for a number of snapshot numbers (see Redshifts-table or check with SELECT DISTINCT snapnum FROM Bolshoi.Dens256), for 2563 grid cells; less strongly smoothed than for Dens256_z0.
Dens512 Dens Density field for redshift 0, for 5123 grid cells
FOF FOF Main Friends-of-Friends catalogue for all available snapshots, level 0 (relative linking length 0.17);
fofId = (snapnum*10 + level)*108 +(rank in FOF-file)
FOF1-FOF5 FOF Friends-of-Friends catalogue for all available snapshots, same as FOF-table, but for smaller (relative) linking lengths, levels 1 (linking length 0.085) to 4 (linking length 0.010625). Thus these tables contain substructures of the FOF groups.
LinkLength LinkLength Overview on levels for FOF groups and corresponding linking lengths (for FOF, FOF1 - FOF4 tables)
LinkLengthScl LinkLength Overview on sclevels for superclusters and corresponding linking lengths (for FOFScl table)
Particles### Particles All simulation particles for snapshots (snapnum denoted by ###) with their positions and velocities.
Currently, only snapshot 416 (redshift z=0) is available.
Redshifts Redshifts Overview on snapshot numbers (snapnum) and corresponding redshifts
Tweb256 Web Eigenvectors and eigenvalues of the gravitational tidal tensor, for a 2563 grid
Tweb512 Web Eigenvectors and eigenvalues of the gravitational tidal tensor, for a 5123 grid
Vweb256 Web Eigenvectors and eigenvalues of the velocity shear tensor, for a 2563 grid
Vweb512 Web Eigenvectors and eigenvalues of the velocity shear tensor, for a 5123 grid

 

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