The 2dF Galaxy Redshift Survey: a targeted study of catalogued clusters of galaxies

Autor: Stephen J. Moody, Kathryn Deeley, George Efstathiou, John A. Peacock, Nicholas Cross, Kark Glazebrook, Ofer Lahav, Shaun Cole, Russell D. Cannon, Carlton M. Baugh, William J. Sutherland, Matthew Colless, Carole Jackson, Chris A. Collins, Keith Taylor, Terry J. Bridges, Carlos S. Frenk, Darren Madgwick, Simon P. Driver, Will J. Percival, Warrick J. Couch, Ian Lewis, Stuart Lumsden, Richard S. Ellis, Peder Norberg, Joss-Bland-Hawthorn, Gavin Dalton, Steve Maddox, Roberto De Propris, Bruce A. Peterson
Rok vydání: 2002
Předmět:
Zdroj: Monthly Notices of the Royal Astronomical Society. 329:87-101
ISSN: 1365-2966
0035-8711
DOI: 10.1046/j.1365-8711.2002.04958.x
Popis: 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 $3.6 \times 10^{-6} \hdens$. 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.
Comment: 32 pages, 11 figures, full table 1 available on specified web address, full author list, published version, one reference added
Databáze: OpenAIRE