Clustering of 2PIGG galaxy groups with 2dFGRS galaxies

Details Clustering of 2PIGG galaxy groups with 2dFGRS galaxies Clustering of 2PIGG galaxy groups with 2dFGRS galaxies

2007-12-19

arxiv.org/abs/0712.3255v1

Astronomy and Astrophysics

Astrophysics

20 pages, 32 figures, 9 tables

Scientific paper

Prompted by indications from QSO lensing that there may be more mass associated with galaxy groups than expected, we have made new dynamical infall estimates of the masses associated with 2PIGG groups and clusters. We have analysed the redshift distortions in the cluster-galaxy cross-correlation function as a function of cluster membership, cross-correlating z<0.12 2PIGG clusters and groups with the full 2dF galaxy catalogue. We have made estimates of the dynamical infall parameter beta and new estimates of the group velocity dispersions. We first find that the amplitude of the full 3-D redshift space cross-correlation function, xi_{cg}, rises monotonically with group membership. We use a simple linear-theory infall model to fit xi(sigma, pi) in the range 5

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