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Published March 1, 2004 | Published + Accepted Version
Journal Article Open

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

Abstract

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.

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.

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Accepted Version - 0402567.pdf

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Additional details

Created:
August 19, 2023
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