MDR1 (mdr1)

Description

MDR1 is the first MultiDark simulation, performed in 2010. A detailed description is available in the paper Prada et al. 2011. This simulation contains about 8.6 billion particles in a (1 Gpc/h)³ cube and thus has a larger volume than the Millennium Simulation, using the more up-to-date WMAP5 cosmology.

Details

Box size	1 Gpc/h	side length of the cosmological cube
Number of particles	2048³	total number of dark matter particles
Mass resolution	8.721*10⁹ M_sun/h	mass of one dark matter particle
Force resolution	7 kpc/h	physical force resolution
Initial redshift	65	redshift at which the simulation started
Cosmology
h	0.70	Hubble parameter
Ω_Λ	0.73	density parameter for dark energy
Ω_m	0.27	density parameter for matter (dark matter+baryons)
Ω_b	0.0469	density parameter for baryonic matter
n	0.95	normalization of the Power spectrum
σ₈	0.82	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
M_sun	1.98892 ± 0.00025 10³³ g	Solar mass (Physics Reports 281 (1997) 309)

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.

Tables

Table	Description
AvailHalos mdr1.availhalos	Gives an overview on the snapshots, for which halo data are stored in the FOF or BDM tables.
BDMV mdr1.bdmv	BDM (Bound Density Maximum) catalogue for all available snapshots, calculated using the standard overdensity criterion with *360 ρ_back** (background density). `bdmid = ( snapnum*10⁸ +(number in BDM catalogue) )`
BDMVProf mdr1.bdmvprof	Halo profiles of the BDMV catalogue for all available snapshots, calculated using the standard overdensity criterion with *360ρ_back** (background density).
BDMW mdr1.bdmw	BDM (Bound Density Maximum) catalogue for all available snapshots, calculated using the standard overdensity criterion with *200 ρ_back** (background density). `bdmid = ( snapnum*10⁸ +(number in BDM catalogue) )`
BDMWMfreq mdr1.bdmwmfreq	Galaxy cluster catalogue for distinct halos from the BDMW catalogue with a total mass (Mtot) above 10¹⁴ M_sun/h, only for snapshots corresponding to the redshift values z = 0, 0.05, 0.1, 0.16, 0.18, 0.2, 0.27, 0.32, 0.37, 0.4, 0.47, 0.53, 0.61, 0.69, 0.78, 0.89 and 1.
BDMWProf mdr1.bdmwprof	Halo profiles of the BDMW catalogue for all available snapshots, calculated using the standard overdensity criterion with *200ρ_back** (background density).
Dens1024_z0 mdr1.dens1024_z0	Density field for redshift 0, for 1024³ grid cells
Dens512_z0 mdr1.dens512_z0	Density field for redshift 0, for 512³ grid cells
FOF mdr1.fof	Main Friends-of-Friends catalogue for all available snapshots, level 0 (relative linking length 0.17); `fofid = (snapnum * 10 + level)*10⁸ +(rank in FOF-file)`
FOF1 mdr1.fof1	Friends-of-Friends catalogue for all available snapshots, same as FOF-table, but for smaller (relative) linking lengths, levels 1 (linking length 0.085) to 4 (linking length 0.010625). Thus these tables contain substructures of the FOF groups.
FOF2 mdr1.fof2	Friends-of-Friends catalogue for all available snapshots, same as FOF-table, but for smaller (relative) linking lengths, levels 1 (linking length 0.085) to 4 (linking length 0.010625). Thus these tables contain substructures of the FOF groups.
FOF3 mdr1.fof3	Friends-of-Friends catalogue for all available snapshots, same as FOF-table, but for smaller (relative) linking lengths, levels 1 (linking length 0.085) to 4 (linking length 0.010625). Thus these tables contain substructures of the FOF groups.
FOF4 mdr1.fof4	Friends-of-Friends catalogue for all available snapshots, same as FOF-table, but for smaller (relative) linking lengths, levels 1 (linking length 0.085) to 4 (linking length 0.010625). Thus these tables contain substructures of the FOF groups.
FOFMtree mdr1.fofmtree	Merger trees for top level FOF groups (level=0) with > 2 * 10¹² M_sun/h from redshift 0. Substructures are not taken into account.
FOFScl mdr1.fofscl	FOF superclusters; contains Friends-of-Friends catalogues for redshift 0, for 7 different (relative) linking lengths between 0.35 (sclevel 0) and 0.17 (sclevel 6)), i.e. much larger objects (superclusters) than in the FOF table. It also contains identifiers for building substructure trees
FOFSub mdr1.fofsub	FOF substructure tree connecting the FOF – FOF4 catalogues at `snapnum=85` (z=0).
LinkLength mdr1.linklength	Overview on levels for FOF groups and corresponding linking lengths (for FOF, FOF1 – FOF4 tables)
LinkLengthScl mdr1.linklengthscl	Overview on sclevels for superclusters and corresponding linking lengths (for FOFScl table)
Redshifts mdr1.redshifts	Overview on snapshot numbers (snapnum) and corresponding redshifts
Rockstar mdr1.rockstar	Consistent halo catalogue with merger trees
TreeSnapnums mdr1.treesnapnums	Maps between snapshot numbers used in the FOF merger trees for MDR1 and the “usual” snapshot numbers.
Tweb512 mdr1.tweb512	Eigenvectors and eigenvalues of the gravitational tidal tensor, for a 512³ grid
Vweb1024 mdr1.vweb1024	Eigenvectors and eigenvalues of the velocity shear tensor, for a 1024³ grid
Vweb512 mdr1.vweb512	Eigenvectors and eigenvalues of the velocity shear tensor, for a 512³ grid