TNG-Cluster

Load one zoom target into a Voronoi dataset. For the X-ray application and example maps, see Fe XXV resonant scattering.

Select the files

For target i, use snapshot chunks i and i+352: the first contains particles in FoF groups; the second contains the outer fuzz. The group catalog is fof_subhalo_tab_099.i.hdf5. Do not combine all targets: their background regions overlap. See the TNG-Cluster data documentation.

pointcloud_voronoi:
  loader: gadget
  pbc: false
  mesh_cache_mode: auto
  gadget:
    path: /path/to/snapdir_099
    catalog_path: /path/to/groups_099
    file_ids: [0, 352]    # target 351: [351, 703]
    zoom_target:
      hid: 0             # primary halo in the selected catalog
      rvir: 2

This is the loader portion of the complete Fe XXV configuration. TNG's iron mass fraction is read from GFM_Metals_Fe. The example aliases atomdbdensity_FeXXV to the transport field cloudydensity_FeXXV.

Cutout and image size

rvir: 2 selects a cube with half-width 2 R200c, from Group_R_Crit200. Target 0 has R200c ≈ 2629 pkpc; its transport cube is about 10,514 pkpc across. The displayed map is only 1000 pkpc across, allowing transport beyond the image.

For another target, set the SB-map bounds to 0.5 ± 500/L, with cube side L in pkpc. Aperture radii already use physical units. Enlarge the full-domain 8000-pkpc diagnostic aperture if needed.

Target 0 contains 50.6 million cells. Mesh construction peaked at 48.1 GiB RSS on the validation host; allow additional memory for the system. The mesh cache avoids rebuilding it for repeated runs.

Dataset reference