Bolshoi (bolshoi)

Description

The Bolshoi simulation (from Russian “big”) has a simulation volume of (250 Mpc/h)³ and a mass resolution of 1.35 * 10⁸ M_sun/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.

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 M_sun/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
Ω_Λ	0.73	density parameter for dark energy
Ω_m	0.27	density parameter for matter (dark matter+baryons)
Ω_b	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)

Attribution

In order to properly acknowledge our efforts, we request the following paragraph to be included in the "Acknowledgements" section of any publication which makes use of the simulation data above via the CosmoSim or MultiDark database:

Acknowledgements – Database

The CosmoSim database used in this paper is a service by the Leibniz-Institute for Astrophysics Potsdam (AIP). The MultiDark database was developed in cooperation with the Spanish MultiDark Consolider Project CSD2009-00064.

Acknowledgements – Simulations

The authors gratefully acknowledge the Gauss Centre for Supercomputing e.V. (www.gauss-centre.eu) and the Partnership for Advanced Supercomputing in Europe (PRACE, www.prace-ri.eu) for funding the MultiDark simulation project by providing computing time on the GCS Supercomputer SuperMUC at Leibniz Supercomputing Centre (LRZ, www.lrz.de). The Bolshoi simulations have been performed within the Bolshoi project of the University of California High-Performance AstroComputing Center (UC-HiPACC) and were run at the NASA Ames Research Center.

More information can be found on the credit page.

Tables

Table	Description
AvailHalos bolshoi.availhalos	Overview for which snapshots/redshifts halo data are available.
BDMV bolshoi.bdmv	BDM (Bound Density Maximum) catalogue for all available snapshots, calculated using the standard overdensity criterion with *360ρ_back** (background density). `bdmid = ( snapnum*10⁸ +(number in BDM catalogue) )`
BDMVProf bolshoi.bdmvprof	Halo profiles of the BDMV catalogue for all available snapshots, calculated using the standard overdensity criterion with *360ρ_back** (background density).
BDMW bolshoi.bdmw	BDM catalogue for all available snapshots, calculated using *200ρ_crit** (critical density) for defining the halo boundary.
BDMWProf bolshoi.bdmwprof	Halo profiles of the BDMW catalogue for all available snapshots, calculated using *200ρ_crit** (critical density) for defining the halo boundary.
Dens256 bolshoi.dens256	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.
Dens256_z0 bolshoi.dens256_z0	Density field for redshift 0, for 256³ grid cells; strongly smoothed
Dens512 bolshoi.dens512	Density field for redshift 0, for 512³ grid cells
Dens512_z0 bolshoi.dens512_z0
FOF bolshoi.fof	Main Friends-of-Friends catalogue for all available snapshots, level 0 (relative linking length 0.17); `fofid = (snapnum10 + level)10⁸ +(rank in FOF-file)`
FOF1 bolshoi.fof1	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 5 (linking length 0.005313). Thus these tables contain substructures of the FOF groups.
FOF2 bolshoi.fof2	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 5 (linking length 0.005313). Thus these tables contain substructures of the FOF groups.
FOF3 bolshoi.fof3	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 5 (linking length 0.005313). Thus these tables contain substructures of the FOF groups.
FOF4 bolshoi.fof4	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 5 (linking length 0.005313). Thus these tables contain substructures of the FOF groups.
FOF5 bolshoi.fof5	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 5 (linking length 0.005313). Thus these tables contain substructures of the FOF groups.
LinkLength bolshoi.linklength	Overview on levels for FOF groups and corresponding linking lengths (for FOF, FOF1 – FOF5 tables)
Redshifts bolshoi.redshifts	Overview on snapshot numbers (`snapnum`) and corresponding redshifts
Tweb256 bolshoi.tweb256	Eigenvectors and eigenvalues of the gravitational tidal tensor, for a 256³ grid
Tweb512 bolshoi.tweb512	Eigenvectors and eigenvalues of the gravitational tidal tensor, for a 512³ grid
Vweb256 bolshoi.vweb256	Eigenvectors and eigenvalues of the velocity shear tensor, for a 256³ grid
Vweb512 bolshoi.vweb512	Eigenvectors and eigenvalues of the velocity shear tensor, for a 512³ grid