FOF-halos from a slice of MDPL2 at redshift z=0. More images

The MultiDark Planck 2 simulation belongs to the series of MultiDark simulations with Planck cosmology. It is kin to the MDPL simulation, with the same box size, cosmological parameters and particle resolution, but a different initial seed.
If you are in doubt whether to use MDPL or MDPL2, we recommend to use MDPL2, since there will be more data products available for this simulation in the future (e.g. Rockstar-catalogues).

Please give proper Credits when using data from this simulation.


Box size 1 Gpc/h side length of the cosmological cube
Number of particles 38403 total number of dark matter particles
Mass resolution 1.51*109 Msun/h mass of one dark matter particle
Force resolution 13 kpc/h (at high z) – 5 kpc/h (low z) physical force resolution
Initial redshift 120 redshift at which the simulation started
h 0.6777 Hubble parameter
ΩΛ 0.692885 density parameter for dark energy
Ωm 0.307115 density parameter for matter (dark matter+baryons)
Ωb 0.048206 density parameter for baryonic matter
n 0.96 normalization of the Power spectrum
σ8 0.8228 amplitude of mass density fluctuation in 8 Mpc/h sphere (at redshift z=0)
Other constants
G 6.67428 * 10-8 cm3 g-1 s-2 Gravitational constant (Rev. Mod. Phys. 80 (2008) 633-730)
1 Mpc 30.85677 * 1023 cm 1 Mpc in cm
Msun 1.98892 ± 0.00025 1033 g Solar mass (Physics Reports 281 (1997) 309)


MDPL2 data in the database

The following table provides an overview on the database tables which are available for this simulation. For each table, a link to its “table type” is given, which leads to a page explaining the individual columns of the table in more detail.

Several tables may contain a Peano-Hilbert key (phkey) for each row, which can be constructed from the position using the hilbert key function. If not indicated otherwise, the hilbert order for this simulation is 10, i.e. there are 210 = 1024 cells per dimension.

Example queries for each table can be found on the end of the table type description pages.

Database table Table type Short description
MDPL2.AvailHalos AvailHalos Gives an overview on the snapshots, for which halo data are stored in the halo catalogues tables. In particular, it gives the number of halos/FOF groups for each snapshot.
MDPL2.FOF FOF Main Friends-of-Friends catalogue for all available snapshots, level 0. Similar to the MDPL simulation, a relative linking length of 0.20 was used (like in MDR1.FOFc table).
fofId = (snapnum*10+level)*1011 + NInFile
FOF Friends-of-Friends catalogue for all available snapshots, same as FOF-table, but for smaller (relative) linking lengths (factor 2 for each step), levels 1 (linking length 0.10) to 5 (linking length 0.00625). Thus these tables contain substructures of the FOF groups.
MDPL2.LinkLength LinkLength Overview on levels for FOF groups and corresponding linking lengths (for FOF, FOF1 – FOF4 tables)
MDPL2.Redshifts Redshifts Overview on snapshot numbers (snapnum) and corresponding redshifts. In addition to the usual Redshifts-table columns, for SMDPL this table also contains a column orig_snapnum, which refers to the original snapshot number of the files. This differs from snapnum, because the simulation was run twice, first with more outputs at later times and second with more outputs at early times.
MDPL2.Rockstar Rockstar ROCKSTAR halo catalogue with consistent merger trees for all available snapshots.
MDPL2.Galacticus Galacticus Galacticus catalog of semi-analytical galaxies, built using the Rockstar catalog
MDPL2.SAG SAG SAG catalog of semi-analytical galaxies, built using Rockstar catalog
MDPL2.SAGE SAGE SAGE catalog of semi-analytical galaxies, built using Rockstar catalog


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