Type Dependent Galaxy Cross-Correlations Explained by Semi-Analytic Model

Details Type Dependent Galaxy Cross-Correlations Explained by Semi-Analytic Model Type Dependent Galaxy Cross-Correlations Explained by Semi-Analytic Model

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20515701b&link_type=abstract

American Astronomical Society Meeting 205, #157.01; Bulletin of the American Astronomical Society, Vol. 36, p.1609

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Scientific paper

We present new results from the largest angular galaxy clustering study to date using Sloan Digital Sky Survey imaging data. In a volume limited sample out to a photometric redshift of z=0.3, we analyze the cross-correlation function of intrinsically red and blue galaxies and find that the clustering behavior of galaxies does not follow the simple linear bias model at small scales and the cross-correlations track the auto-correlation function of the blue galaxies. We analyze mock catalogs from the GIF2 high-resolution cosmological simulations and find that the semi-analytic models show similar trends and the two-point functions are in an excellent qualitative agreement with the SDSS results. In the simulated catalogs, one can separate the different contributions to the correlation functions; pairs from the same halo and from different haloes. We find that the halo model provides an explaination to the puzzling signature seen in the SDSS measurements at short scales and the red vs. blue galaxy cross-correlation function converges to the geometrical mean of the two auto-correlation functions only at larger scales, where the 2-halo term dominates.

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