Open Access
Table 1
Summary of the main parameters that can be tuned to run ASOHF.
| Parameter | (Symbol) | Description and remarks |
|---|---|---|
| Parameters for halo finding: mesh creation and halo identification | ||
| Base grid size | Nx | Typically set to  |
| Number of refinement levels | nℓ | Peak resolution will be L/(Nx × 2nℓ), typically set to match the force resolution of the simulation |
| Number of particles to flag a cell as ‘refinable’ |  |
|
| Fraction of refinable cells to extend the patch |  |
A patch is grown along a direction only if more than this fraction of the newly added cells is refinable |
| Minimum size of the patch to be accepted |  |
Only patches with minimum dimension above this are accepted Exclude these many cells close to the domain boundary (≥1) Idem., in each AMR grid (≥0) |
| Base grid refinement border | ||
| AMR grids refinement border | ||
| Kernel order for interpolating density from particles | Either 1 (linear kernel) or 2 (quadratic kernel; recommended) | |
| Particle species | Assign kernel size by particle mass, local density, or none | |
| Minimum number of particles per halo |  |
Discard haloes below this number of particles (e.g. 25) |
| Stellar haloes | ||
| Component used for mesh halo finding | Use only DM or DM+stars for identifying density peaks | |
| Kernel width for stars | ℓstars | Interpolate stars in a cloud of radius  |
| Minimum number of stellar particles per stellar halo | ||
| Density increase (from inner minimum) to cut the halo | fgap | See Sect. 2.5 |
| Maximum radial distance without stars to cut the halo | ℓgap | See Sect. 2.5 |
| Minimum density (in units of ρB(z)) to cut the halo | fB | See Sect. 2.5 |
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