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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