Open AccessThe 2dF Galaxy Redshift Survey: the clustering of galaxy groups
Author(s) -
Padilla Nelson D.,
Baugh Carlton M.,
Eke Vincent R.,
Norberg Peder,
Cole Shaun,
Frenk Carlos S.,
Croton Darren J.,
Baldry Ivan K.,
BlandHawthorn Joss,
Bridges Terry,
Can Russell,
Colless Matthew,
Collins Chris,
Couch Warrick,
Dalton Gavin,
De Propris Roberto,
Driver Simon P.,
Efstathiou George,
Ellis Richard S.,
Glazebrook Karl,
Jackson Carole,
Lahav Ofer,
Lewis Ian,
Lumsden Stuart,
Maddox Steve,
Madgwick Darren,
Peacock John A.,
Peterson Bruce A.,
Sutherland Will,
Taylor Keith
Publication year - 2004
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2004.07911.x
Subject(s) - physics , astrophysics , cluster analysis , luminosity , galaxy group , redshift , galaxy , astronomy , galaxy cluster , field galaxy , redshift survey , luminosity function , statistics , mathematics
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.