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

Monthly Notices of the Royal Astronomical Society 348:3 (2004) 866-878

Authors:

VR Eke, CM Baugh, S Cole, CS Frenk, P Norberg, JA Peacock, IK Baldry, J Bland-Hawthorn, T Bridges, R Cannon, M Colless, C Collins, W Couch, G Dalton, R De Propris, SP Driver, G Efstathiou, RS Ellis, K Glazebrook, C Jackson, O Lahav, I Lewis, S Lumsden, S Maddox, D Madgwick, BA Peterson, W Sutherland, K Taylor

Abstract:

The construction of a catalogue of galaxy groups from the Two-degree Field Galaxy Red-shift 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.
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Galaxy Ecology: groups and low density environments in the SDSS and 2dFGRS

Monthly Notices of the Royal Astronomical Society 348 (2004) 1355-1372

Authors:

IJ Lewis, M Balogh, V Eke, C Miller
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The 2dF Galaxy Redshift Survey: The blue galaxy fraction and implications for the Butcher-Oemler effect

(2004)

Authors:

Roberto De Propris, Matthew Colless, John Peacock, Warrick Couch, Simon Driver, Michael Balogh, Ivan Baldry, Carlton Baugh, Joss Bland-Hawthorn, Terry Bridges, Russell Cannon, Shaun Cole, Chris Collins, Nicholas Cross, Gavin Dalton, George Efstathiou, Richard Ellis, Carlos Frenk, Karl Glazebrook, Edward Hawkins, Carole Jackson, Ofer Lahav, Ian Lewis, Stuart Lumsden, Steve Maddox, Darren Madgwick, Peder Norberg, Will Percival, Bruce Peterson, Will Sutherland, Keith Taylor
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The 2dF Galaxy Redshift Survey: The clustering of galaxy groups

(2004)

Authors:

Nelson D Padilla, CM Baugh, VR Eke, P Norberg, S Cole, CS Frenk, DJ Croton, IK Baldry, J Bland-Hawthorn, T Bridges, R Cannon, M Colless, C Collins, W Couch, G Dalton, R De Propris, SP Driver, G Efstathiou, RS Ellis, K Glazebrook, C Jackson, O Lahav, I Lewis, S Lumsden, S Maddox, D Madgwick, JA Peacock, BA Peterson, W Sutherland, K Taylor.
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Galaxy groups in the 2dFGRS: the luminous content of the groups

(2004)

Authors:

VR Eke, CS Frenk, CM Baugh, S Cole, P Norberg, JA Peacock, IK Baldry, J Bland-Hawthorn, T Bridges, R Cannon, M Colless, C Collins, W Couch, G Dalton, R De Propris, SP Driver, G Efstathiou, RS Ellis, K Glazebrook, C Jackson, O Lahav, I Lewis, S Lumsden, S Maddox, D Madgwick, BA Peterson, W Sutherland, K Taylor
More details from the publisher