FOFMtree (mdr1.fofmtree)
The table has 181523200 rows, 21 columns.
Description
Merger trees for top level FOF groups (level=0) with > 2 * 1012 Msun/h from redshift 0. Substructures are not taken into account.
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.
Columns
| Name | Type | UCD | Unit | Description |
|---|---|---|---|---|
| foftreeid | long |
meta.id meta.main |
unique id for FOF-group = treeRootId + rank in merger tree (depth first order) |
|
| fofid | long | meta.id |
corresponding id of this FOF group in the FOF table |
|
| treesnapnum | short | time.epoch |
subsequent number of snapshot used for creating the merger tree, not the same number as in FOF table |
|
| descendantid | long | meta.id.assoc |
fofTreeId for direct descendant (to which the FOF group will merge in the next timestep) |
|
| lastprogid | long | meta.id.assoc |
fofTreeId of last progenitor in depth-first order |
|
| mainleafid | long | meta.id.assoc |
fofTreeId of last leaf on main branch, which is defined by the most massive progenitors |
|
| treerootid | long | meta.id.assoc |
root in merger tree |
|
| 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 pos.cartesian.x |
km.s-1 |
comoving velocity, x-component |
| vy | double |
phys.veloc pos.cartesian.y |
km.s-1 |
comoving velocity, y-component |
| vz | double |
phys.veloc pos.cartesian.z |
km.s-1 |
comoving 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 |