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Void Finding

Run python ./generateCatalog.py [name of pipeline script] for each script written by prepareCatalogs. This will run

  • generateMock for building samples and slices
  • zobov for finding voids
  • pruneVoids for cleaning voids near boundaries and building the hierarchy

At the end of it, you should have a void catalog for each redshift, slice, and subdivision.

Check the logfiles (found in your logDir) for any error messages.

Outputs directories are organized as follows:

[prefix]_[type]_[setting]/sample_[prefix]_[type]_[setting]_z[redshift]_d[division]

where

  • [prefix] is your defined prefix for outputs
  • [type] is either ss for subsampled particles, hod for HOD, or halos for halo catalogs
  • [setting] subsampling level, minimun halo mass, or HOD name
  • [redshift] starting redshift of the slice
  • [division] x- and y- subdivision

The VIDE outputs are as follows:

  • sample_info.txt: Small text file which lists some basic info of the sample

  • zobov_slice_[sample_name].dat: Binary file with the galaxy positions, RA, Dec, redshift, and unique catalog ID. Note that this file contains all particles in the particular sample, not just void particles.

  • voidDesc_[all,central]_[sample_name].out: ASCII file with void indices and basic void properties in ZOBOV-normalized units.

  • voidZone_[sample_name].out: Binary file which links voids to zones.

  • voidPart_[sample_name].out: Binary file which links zones to particles.

  • vol_[sample_name].out: Binary file with particle local volumes

In addition, VIDE provides the following derived void information:

  • centers_[all, central]_[sample_name].txt: ASCII file with void centers, volume, effective radius, void ID, density contrast, etc.

  • sky_positions_[all, central]_[sample_name].txt: ASCII file with void RA, dec, effective radius, and void ID

  • shapes_[all, central]_[sample_name].txt: ASCII file with best-fit eigenvalues and eigenvectors for each void, in same coordinate system as x,y,z values in centers file

In addition to the [all,central] version of each file above, there are four versions of each catalog:

  • no prefix: only parent voids, density cut applied (default catalog)

  • untrimmed: all voids in hierarchy, density cut not applied

  • untrimmed_dencut: all voids in hierarchy, density cut applied [deprecated]

  • trimmed_nodencut: only parent voids, density cut not applied [deprecated]

We recommend using the included python interface for loading and manipulating the void outputs.

Updated