Galaxy Groups in the 2dFGRS: the number density of groups

Details Galaxy Groups in the 2dFGRS: the number density of groups Galaxy Groups in the 2dFGRS: the number density of groups

2005-10-21

arxiv.org/abs/astro-ph/0510643v1

Mon.Not.Roy.Astron.Soc.370:1147-1158,2006

Astronomy and Astrophysics

Astrophysics

Submitted to MNRAS, 12 pages, 17 figures (1 in colour)

Scientific paper

10.1111/j.1365-2966.2006.10568.x

The abundance of galaxy clusters as a function of mass is determined using the 2dFGRS Percolation-Inferred Galaxy Group (2PIGG) catalogue. This is used to estimate the amplitude of the matter fluctuation spectrum, parametrised by the linear theory rms density fluctuations in spheres of 8Mpc/h, sigma_8. The best-fitting value for this parameter is highly correlated with the mean matter density in the Universe, Omega_m, and is found to satisfy sigma_8=0.25Omega_m^{-0.92-4.5(Omega_m-0.22)^2}+/-10%(statistical)+/-20% (systematic) for 0.18

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