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Galaxy groups in the 2dFGRS : the group-finding algorithm and the 2PIGG catalogue.

Eke, V. R. and Baugh, C. M. and Cole, Shaun and Frenk, C. S. and Norberg, P. and Peacock, J. A. and Baldry, I. K. and Bland-Hawthorn, J. and Bridges, T. and Cannon, R. and Colless, M. and Collins, C. and Couch, W. and Dalton, G. and de Propris, R. and Driver, S. P. and Efstathiou, G. and Ellis, R. S. and Glazebrook, K. and Jackson, C. and Lahav, O. and Lewis, I. and Lumsden, S. and Maddox, S. and Madgwick, D. and Peterson, B. A. and Sutherland, W. (2004) 'Galaxy groups in the 2dFGRS : the group-finding algorithm and the 2PIGG catalogue.', Monthly notices of the Royal Astronomical Society., 348 (3). pp. 866-878.


The construction of a catalogue of galaxy groups from the Two-degree Field Galaxy Redshift Survey (2dFGRS) is described. Groups are identified by means of a friends-of-friends percolation algorithm which has been thoroughly tested on mock versions of the 2dFGRS generated from cosmological N-body simulations. The tests suggest that the algorithm groups all galaxies that it should be grouping, with an additional 40 per cent of interlopers. About 55 per cent of the 190 000 galaxies considered are placed into groups containing at least two members of which 29 000 are found. Of these, 7000 contain at least four galaxies, and these groups have a median redshift of 0.11 and a median velocity dispersion of 260 km s1. This 2dFGRS Percolation-Inferred Galaxy Group (2PIGG) catalogue represents the largest available homogeneous sample of galaxy groups. It is publicly available on the World Wide Web.

Item Type:Article
Keywords:Catalogues, Galaxies, Clusters.
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Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2004 The Authors Published on behalf of Royal Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:11 August 2014
Date of first online publication:March 2004
Date first made open access:No date available

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