Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-09
Mon.Not.Roy.Astron.Soc.376:984-996,2007
Astronomy and Astrophysics
Astrophysics
16 pages, 12 figures, accepted for publication in Monthly Notices, typos corrected
Scientific paper
10.1111/j.1365-2966.2007.11518.x
By comparing semi-analytic galaxy catalogues with data from the Sloan Digital Sky Survey (SDSS), we show that current galaxy formation models reproduce qualitatively the dependence of galaxy clustering and pairwise peculiar velocities on luminosity, but some subtle discrepancies with the data still remain. The comparisons are carried out by constructing a large set of mock galaxy redshift surveys that have the same selection function as the SDSS Data Release Four (DR4). The mock surveys are based on two sets of semi-analytic catalogues presented by Croton et al. and Kang et al. From the mock catalogues, we measure the redshift-space projected two-point correlation function, the power spectrum, and the pairwise velocity dispersion (PVD) in Fourier space and in configuration space, for galaxies in different luminosity intervals. We then compare these theoretical predictions with the measurements derived from the SDSS DR4. On large scales and for galaxies brighter than L*, both sets of mock catalogues agree well with the data. For fainter galaxies, however, both models predict stronger clustering and higher pairwise velocities than observed. We demonstrate that this problem can be resolved if the fraction of faint satellite galaxies in massive haloes is reduced by ~30% compared to the model predictions. A direct look into the model galaxy catalogues reveals that a signifcant fraction (15%) of faint galaxies ($-18
Boerner Gerhard
Jing Yi-Peng
Kang Xi
Kauffmann Guinevere
Li Cheng
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