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Published July 2004 | Published + Accepted Version
Journal Article Open

The 2dF Galaxy Redshift Survey: the clustering of galaxy groups

Abstract

We measure the clustering of galaxy groups in the 2dFGRS Percolation-Inferred Galaxy Group (2PIGG) catalogue. The 2PIGG sample has 28 877 groups with at least two members. The clustering amplitude of the full 2PIGG catalogue is weaker than that of 2dFGRS galaxies, in agreement with theoretical predictions. We have subdivided the 2PIGG catalogue into samples that span a factor of ≈ 25 in median total luminosity. Our correlation function measurements span an unprecedented range of clustering strengths, connecting the regimes probed by groups fainter than L* galaxies and rich clusters. There is a steady increase in clustering strength with group luminosity; the most luminous groups are 10 times more strongly clustered than the full 2PIGG catalogue. We demonstrate that the 2PIGG results are in very good agreement with the clustering of groups expected in the ΛCDM model.

Additional Information

© 2004 RAS. Accepted 2004 April 7. Received 2004 March 30; in original form 2004 March 1. This work was supported by a PPARC rolling grant at the University of Durham. NDP acknowledges receipt of a British Council-Fundación Antorchas fellowship. CMB was supported by a Royal Society University Research Fellowship.

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Accepted Version - 0402577.pdf

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