The angular correlation function of galaxies in cold dark matter and cold plus hot dark matter models

Details The angular correlation function of galaxies in cold dark matter and cold plus hot dark matter models The angular correlation function of galaxies in cold dark matter and cold plus hot dark matter models

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...432l..11y&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 432, no. 1, p. L11-L14

Astronomy and Astrophysics

Astrophysics

3

Angular Correlation, Astronomical Models, Cosmology, Dark Matter, Galactic Clusters, Astronomical Catalogs, Astronomical Photometry, Computerized Simulation, Error Analysis

Scientific paper

We estimate the angular correlation functions, w(theta), for the standard cold dark matter (CDM), tilted n = 0.7 CDM and hybrid cold hot dark matter (CHDM) models, and compare with observations. When compared with the APM observational results scaled to the Lick depth, there appears to be fair agreement with the estimate from the CHDM model. But a more detailed comparison using the unscaled APM data for the five magnitude slices with delta bj = 0.5 shows that, in fact, none of the models can actually fit w(theta) for all the slices simultaneously. The CDM and tilted CDM models are then seen to fall below the APM data by a factor approx. 2 at theta = 1 deg, where the observed w(theta) is still relatively large (approx. 0.1) and, thus, probably less affected by any possible residual systematic errors. As n = 0.7 tilted CDM and SCDM bracket all possible tilted models, we conclude that none of the tilted models is consistent with the APM results. With CHDM, a w(theta) amplitude that is 30% - 40% too high on scales theta less than 0.5 deg is predicted for the deepest slices bj approx. equals 20). We find that no reasonable simple variation of the parameters for the luminosity function or for the evolution of the correlation function with redshift could change the situation. Thus, the discrepancy between the APM data and the CHDM model, though small, seems to be real.

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