Dark Matter Halo Merger Trees

This dataset is generated from the Genesis suite of dark matter only N-body simulations (C. Power et al in prep). L10_N2048 is a periodic cubical simulation of side 10 h^-1 Mpc, with 2048^3 particles each of mass 1.0e4 h^-1 solar units. It is used as the initial condition for models presented in E. M. Ventura et al. (2024) S. Balu, along with input from C. Power ran the simulation using the SWIFT (Schaller et al. 2023) cosmological code, identified haloes using the six-dimensional phase-space halo-finder VELOCIraptor (Elahi et al. 2019a), and constructed the merger trees with TREEFROG (Elahi et al. 2019b). During the halo-finding, Friends-of-Friends group require a minimum of 32 particles and the subhaloes need atleast 20 particles. S. Balu converted the original files into the format required by Meraxes using codes developed by S. Mutch with help from Y. Qin and E. M. Ventura.

After decompressing, the dataset has the following structure.

├── a_list.txt (the scale factor at all 120 snapshots)
├── grids (average density and velocity)
│   ├── snap
│   ├── snap_0000.hdf5
│   ├── snap_0001.hdf5
│   ├── ...
│   ├── snap_0119.hdf5
└── trees
    ├── meraxes_augmented_stats.h5 (forest information)
    └── trees_trimmed.hdf5 (halo properties)