Dens256_z0 (bolshoi.dens256_z0)

The table has 16777232 rows, 6 columns.


Density field for redshift 0, for 2563 grid cells; strongly smoothed


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. ( and the Partnership for Advanced Supercomputing in Europe (PRACE, for funding the MultiDark simulation project by providing computing time on the GCS Supercomputer SuperMUC at Leibniz Supercomputing Centre (LRZ, 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.


Name Type UCD Unit Description
webid long

unique id for the entry in the database table, corresponds to the line number in the original file, starting with 0 at first line

ix int pos.cartesian.x

spatial grid index, x-direction; ix= floor(x/nx); multiply/divide by factors of 2 when comparing with a finer/coarser grid

iy int pos.cartesian.y

spatial grid index, y-direction; iy = floor(y/ny)

iz int pos.cartesian.z

spatial grid index, z-direction; iz = floor(z/nz)

phkey int

Peano-Hilbert key; multiply/divide by factors of 8 when comparing with a finer/coarser grid

dens double phys.density

overdensity, dens = (ρ - ρb)/ρb
ρb = mean background density of matter