Page tree

Versions Compared


  • This line was added.
  • This line was removed.
  • Formatting was changed.

This simulation is good for

  • Modelling galaxies with stellar masses above ~107.5 Msun
  • Probing scales up to 250h-1 Mpc (without repetition)
  • Resolving small structures with high time resolution


The Bolshoi (Planck) simulation follows the particle number and volume of the Bolshoi simulation, but has a more up-to-date set of cosmological parameters, based on the Planck satellite data.  The simulation was run with the Adaptive Refinement Tree (ART) code.  The simulation is part of the MultiDark family of simulations described in Klypin et al. (2016) and on the CosmoSim website.



Box length: 250h-1 cMpc

Relative volume to Millennium and an all-sky survey out to z=0.05:

Particle mass: 1.55 × 108h-1 Msun
Gravitational softening: 1h-1 ckpc
Number of particles: 20483
Number of snapshots to z=0: 178

Particle size compared to Millennium:

Bolshoi (Planck) has 5.55 times higher mass resolution than Millennium, meaning a Bolshoi (Planck) halo contains 5.55 times the number of particles of a Millennium halo of equivalent mass.


The cosmological parameters of the Bolshoi (Planck) simulation are based on Planck data released in 2013 (published as Planck Collaboration XVI 2014).

ΩM = 0.307
ΩΛ = 0.693
Ωb = 0.048

σ8 = 0.823
n = 0.96
h = 0.678


Haloes and subhaloes were identified using ROCKSTAR, with merger trees subsequently built with CONSISTENT-TREES.  Where other codes might only use the positions of particles to build haloes, ROCKSTAR uses the velocities of particles as well.  The trees follow all (sub)haloes down to as few as 2 particles.

Semi-analytic galaxies

Galaxy catalogues for Bolshoi (Planck) available on TAO have been built with the following semi-analytic models: