BDMW (mdr1.bdmw)

The table has 467761504 rows, 30 columns.


BDM (Bound Density Maximum) catalogue for all available snapshots, calculated using the standard overdensity criterion with 200 * ρback (background density).
bdmid = ( snapnum*108 +(number in BDM catalogue) )


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
bdmid long

unique id for bdm-halo

snapnum short time.epoch

number of snapshot

nincat long

number of halo in BDM catalogue file (= "Nhalo")

hostflag long

index (flag) indicating if substructure or host; -1 for distinct halo, bdmId of parent halo for subhalos

x double pos.cartesian.x h-1.Mpc

(comoving) position, x-component

y double pos.cartesian.y h-1.Mpc

(comoving) position, y-component

z double pos.cartesian.z h-1.Mpc

(comoving) position, z-component

vx double phys.veloc

(peculiar) velocity, x-component

vy double phys.veloc

(peculiar) velocity, y-component

vz double phys.veloc

(peculiar) velocity, z-component

np int meta.number

number of particles in halo

mvir double phys.mass h-1.solMass

halo mass - mass of bound particles within Rvir

mtot double phys.mass h-1.solMass

halo mass - mass of all particles within Rvir

rvir double phys.size.radius h-1.Mpc

virial radius

vrms double phys.veloc.dispersion km.s-1

root mean square proper velocities of bound dark matter particles

vcir double phys.veloc km.s-1

maximum circular velocity in the halo

conc double phys.size

concentration of the halo as found from Vcirc / sqrt(G Mvir / Rvir) assuming a NFW profile

xoff double phys.size

offset parameter

virialratio double

virial ratio = 2 K/Epot - 1

spin double

spin parameter

rrms double phys.size.radius h-1.Mpc

root mean square distance of halo particles

axisratio_2_1 double

ratio of intermediate to major axis (as estimated in a spherical region via the modified inertia tensor)

axisratio_3_1 double

ratio of minor to major axis

axis1_x double

x-component of major axis

axis1_y double

y-component of major axis

axis1_z double

z-component of major axis

ix int pos.cartesian.x

spatial index, x-direction

iy int pos.cartesian.y

spatial index, y-direction

iz int pos.cartesian.z

spatial index, z-direction

phkey int

Peano-Hilbert-key, i.e. index along the Peano-Hilbert curve