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The 2dF Galaxy Redshift Survey: A targeted study of catalogued clusters of galaxies | | Roberto De Propris
; Warrick Couch
; Matthew Colless
; Gavin Dalton
; Chris Collins
; Carlton Baugh
; Joss-Bland-Hawthorn
; Terry Bridges
; Russell Cannon
; Shaun Cole
; Nicholas Cross
; Kathryn Deeley
; Simon Driver
; George Efstathiou
; Richard Ellis
; Carlos Frenk
; Kark Glazebrook
; Carole Jackson
; ofer Lahav
; Ian Lewis
; Stuart Lumsden
; Steve Maddox
; Darren Madgwick
; Stephen Moody
; Peder Norberg
; John Peacock
; Will Percival
; Bruce Peterson
; Will Sutherland
; Keith Taylor
; | | Date: |
11 Sep 2001 | | Journal: | Mon.Not.Roy.Astron.Soc. 329 (2002) 87 | | Subject: | astro-ph | | Abstract: | We have carried out a study of known clusters within the 2dF Galaxy Redshift Survey (2dFGRS) observed areas and have identified 431 Abell, 173 APM and 343 EDCC clusters. Precise redshifts, velocity dispersions and new centroids have been measured for the majority of these objects, and this information has been used to study the completeness of these catalogues, the level of contamination from foreground and background structures along the cluster’s line of sight, the space density of the clusters as a function of redshift, and their velocity dispersion distributions. We find that the Abell and EDCC catalogues are contaminated at the level of about 10%, whereas the APM catalogue suffers only 5% contamination. If we use the original catalog centroids, the level of contamination rises to approximately 15% for the Abell and EDCC catalogues, showing that the presence of foreground and background groups may alter the richness of clusters in these catalogues. There is a deficiency of clusters at $z sim 0.05$ that may correspond to a large underdensity in the Southern hemisphere. From the cumulative distribution of velocity dispersions for these clusters, we derive an upper limit to the space density of $sigma > 1000 kms$ clusters of $3.6 imes 10^{-6} hdens$. This result is used to constrain models for structure formation; our data favour low-density cosmologies, subject to the usual assumptions concerning the shape and normalization of the power spectrum. | | Source: | arXiv, astro-ph/0109167 | | Services: | Forum | Review | PDF | Favorites | |
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