ZOBOV: a parameterfree voidfinding algorithm
Abstract
ZOBOV (ZOnes Bordering On Voidness) is an algorithm that finds density depressions in a set of points, without any free parameters, or assumptions about shape. It uses the Voronoi tessellation to estimate densities, which it uses to find both voids and subvoids. It also measures probabilities that each void or subvoid arises from Poisson fluctuations. This paper describes the ZOBOV algorithm, and the results from its application to the dark matter particles in a region of the Millennium simulation. Additionally, the paper points out an interesting highdensity peak in the probability distribution of dark matter particle densities.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 June 2008
 DOI:
 10.1111/j.13652966.2008.13180.x
 arXiv:
 arXiv:0712.3049
 Bibcode:
 2008MNRAS.386.2101N
 Keywords:

 methods: data analysis;
 cosmology: theory;
 largescale structure of Universe;
 Astrophysics
 EPrint:
 10 pages, 8 figures, MNRAS, accepted. Added explanatory figures, and better edgedetection methods. ZOBOV code available at http://www.ifa.hawaii.edu/~neyrinck/voboz