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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 n 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 stars 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 gap See Sect. 2.5
Minimum density (in units of ρB(z)) to cut the halo fB See Sect. 2.5

Notes. The first block contains the parameters that have effect on the identification of haloes, and the second block refers to the stellar halo-finding procedure.

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