FOFSub (mdr1.fofsub)

The table has 32192552 rows, 23 columns.


FOF substructure tree connecting the FOF – FOF4 catalogues at snapnum=85 (z=0).


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
fofsubid long

unique id for FOF-group, = treeRootId + rank in substructure tree (depth first order)

fofid long time.epoch

fofId in corresponding FOF-table (FOF - FOF4)

level short

level of substructure, indicates the different linking lengths

ninfile int

line number of FOF-group in original catalogue file (= rank in file)

hostid long

fofSubId of the direct host

lastsubid long

fofSubId of last subhalo in depth-first order substructure tree

mainleafid long

fofSubId of last leaf on main branch of substructure tree; "main branch" is defined as the branch along the most massive substructures

treerootid long

root of the substructure tree (group with largest linking length)

nloose int meta.number

number of particles not associated with any substructure of this group

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 inside the FOF group

mass double phys.mass h-1.solMass

total mass of the FOF group

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

"radius" of the FOF group, if it were a sphere, computed based on the volume

spin double

spin parameter (Gottlöber & Yepes 2007, ApJ 664, 117)

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