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

Eke, V. R. and Baugh, Carlton M. and Cole, Shaun and Frenk, Carlos S. and Norberg, Peder and Peacock, John A. and Baldry, Ivan K. and Bland-Hawthorn, Joss and Bridges, Terry and Cannon, Russell and Colless, Matthew and Collins, Chris and Couch, Warrick and Dalton, Gavin and De Propris, Roberto and Driver, Simon P. and Efstathiou, George and Ellis, Richard S. and Glazebrook, Karl and Jackson, Carole and Lahav, Ofer and Lewis, Ian and Lumsden, Stuart and Maddox, Steve and Madgwick, Darren and Peterson, Bruce A. and Sutherland, Will and Taylor, Keith (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. ISSN 0035-8711.

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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 s⁻¹. 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
Related URLs:
URLURL TypeDescription Paper
Baugh, Carlton M.0000-0002-9935-9755
Norberg, Peder0000-0002-5875-0440
Bland-Hawthorn, Joss0000-0001-7516-4016
Colless, Matthew0000-0001-9552-8075
Ellis, Richard S.0000-0001-7782-7071
Additional Information:© 2004 RAS. Accepted 2003 November 6. Received 2003 October 31; in original form 2003 August 11. VRE and CMB are Royal Society University Research Fellows. JAP is grateful for a PPARC Senior Research Fellowship.
Funding AgencyGrant Number
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
Subject Keywords:catalogues, galaxies: clusters: general
Issue or Number:3
Record Number:CaltechAUTHORS:20200708-151733246
Persistent URL:
Official Citation:V. R. Eke, Carlton M. Baugh, Shaun Cole, Carlos S. Frenk, Peder Norberg, John A. Peacock, Ivan K. Baldry, Joss Bland-Hawthorn, Terry Bridges, Russell Cannon, Matthew Colless, Chris Collins, Warrick Couch, Gavin Dalton, Roberto De Propris, Simon P. Driver, George Efstathiou, Richard S. Ellis, Karl Glazebrook, Carole Jackson, Ofer Lahav, Ian Lewis, Stuart Lumsden, Steve Maddox, Darren Madgwick, Bruce A. Peterson, Will Sutherland, Keith Taylor, (the 2dFGRS Team), Galaxy groups in the 2dFGRS: the group-finding algorithm and the 2PIGG catalogue, Monthly Notices of the Royal Astronomical Society, Volume 348, Issue 3, March 2004, Pages 866–878,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104288
Deposited By: Rebecca Minjarez
Deposited On:10 Jul 2020 15:39
Last Modified:10 Jul 2020 15:39

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