Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-12-20
Mon.Not.Roy.Astron.Soc. 361 (2005) 415-427
Astronomy and Astrophysics
Astrophysics
15 pages, 15 figures. MNRAS accepted version. Adds appx. on profile fitting; now use truncated NFW
Scientific paper
10.1111/j.1365-2966.2005.09172.x
The popular halo model predicts that the power spectrum of the galaxy fluctuations is simply the sum of the large scale linear halo-halo power spectrum and the weighted power spectrum of the halo profile. Previous studies have derived halo parameters from the observed galaxy correlation function. Here we test the halo model directly for self-consistency with a minimal set of theoretical assumptions by utilising the 2dF Galaxy Redshift Survey (2dFGRS). We derive empirically the halo occupation and galaxy radial distributions in the haloes of the 2dF Percolation-Inferred Galaxy Group (2PIGG) catalogue. The mean halo occupation number is found to be well-fitted by a power-law,
Collister Adrian A.
Lahav Ofer
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