The Voronoi Tessellation Cluster Finder in 2 1 Dimensions

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We present a detailed description of the Voronoi Tessellation (VT) cluster finder algorithm in 2+1 dimensions, which improves on past implementations of this technique. The need for cluster finder algorithms able to produce reliable cluster catalogs up to redshift 1 or beyond and down to 10{sup 13.5} solar masses is paramount especially in light of upcoming surveys aiming at cosmological constraints from galaxy cluster number counts. We build the VT in photometric redshift shells and use the two-point correlation function of the galaxies in the field to both determine the density threshold for detection of cluster candidates and to establish ... continued below

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16 pages

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Soares-Santos, Marcelle; U., /Fermilab /Sao Paulo; de Carvalho, Reinaldo R.; /Sao Jose, INPE; Annis, James; /Fermilab et al. June 23, 2011.

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Description

We present a detailed description of the Voronoi Tessellation (VT) cluster finder algorithm in 2+1 dimensions, which improves on past implementations of this technique. The need for cluster finder algorithms able to produce reliable cluster catalogs up to redshift 1 or beyond and down to 10{sup 13.5} solar masses is paramount especially in light of upcoming surveys aiming at cosmological constraints from galaxy cluster number counts. We build the VT in photometric redshift shells and use the two-point correlation function of the galaxies in the field to both determine the density threshold for detection of cluster candidates and to establish their significance. This allows us to detect clusters in a self-consistent way without any assumptions about their astrophysical properties. We apply the VT to mock catalogs which extend to redshift 1.4 reproducing the ?CDM cosmology and the clustering properties observed in the Sloan Digital Sky Survey data. An objective estimate of the cluster selection function in terms of the completeness and purity as a function of mass and redshift is as important as having a reliable cluster finder. We measure these quantities by matching the VT cluster catalog with the mock truth table. We show that the VT can produce a cluster catalog with completeness and purity >80% for the redshift range up to {approx}1 and mass range down to {approx}10{sup 13.5} solar masses.

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16 pages

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  • Journal Name: Astrophys.J.727:45,2011; Journal Volume: 727; Journal Issue: 1

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  • Report No.: SLAC-PUB-14325
  • Grant Number: AC02-76SF00515
  • DOI: 10.1088/0004-637X/727/1/45 | External Link
  • Office of Scientific & Technical Information Report Number: 1017202
  • Archival Resource Key: ark:/67531/metadc834020

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 23, 2011

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Dec. 8, 2016, 1:49 p.m.

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Soares-Santos, Marcelle; U., /Fermilab /Sao Paulo; de Carvalho, Reinaldo R.; /Sao Jose, INPE; Annis, James; /Fermilab et al. The Voronoi Tessellation Cluster Finder in 2 1 Dimensions, article, June 23, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc834020/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.