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Public Cosmic Void Catalog

catalog reconciliation

18 Jul 2016, 16:24 UTC
catalog reconciliation
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There have been a few questions raised recently about apparent inconsistencies among the three (July, August, and November) releases. We would like to take this opportunity to explain the differences in more detail. If you are not already doing so, please use the November release!The catalog inconsistencies can be explained by:1) A lower radius threshold for including voids in the November release. Previously, it was two times the mean galaxy separation. We now include voids all the way down to the mean galaxy separation. Also note that we miscalculated the mean galaxy separation for the dim1 sample; this has been corrected. Use the smallest voids at your own risk; you may wish to impose an arbitrary cutoff (e.g., 2*r_min or 4*r_min) for your analysis.2) Different handling of the high-redshift cap of each subsample. In July and August, we were placing mock particles along the cap and treating voids there just like voids at the mask boundaries (i.e., these would appear as "edge" voids). However, this procedure was giving us difficulty at higher redshift, so we switched to a simpler approach: we no longer place mock particles at the redshift cap and remove all voids that might intersect the upper redshift ...

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