Galaxy groups in the 2dFGRS: the group-finding algorithm and the 2PIGG catalogue
Eke, Vincent R; Baugh, Carlton M; Cole, Shaun; Frenk, Carlos S; Norberg, Peder; Peacock, John A; Baldry, Ivan K; Bland-Hawthorn, Joss; Bridges, Terry C; Cannon, Russell; Colless, Matthew; Collins, Chris; Couch, Warrick; Dalton, Gavin; De Propris, Roberto; Driver, Simon; Efstathiou, George; Ellis, Richard S; Glazebrook, Karl; Jackson, Carole; Lahav, Ofer; Lewis, Ian; Lumsden, Stuart; Maddox, Steve J; Madgwick, Darren; Peterson, Bruce; Sutherland, William J; Taylor, Keith
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...[Show more]
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