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

Abstract

view Abstract Citations (3) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Angular Correlation Function of Galaxies in Cold Dark Matter and Cold Plus Hot Dark Matter Models Yepes, G. ; Klypin, A. A. ; Campos, A. ; Fong, R. Abstract We estimate the angular correlation functions, w(θ), for the standard CDM, tilted n = 0.7 CDM and hybrid (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 δb_j_ = 0.5 shows that, in fact, none of the models can actually fit w(θ) for all the slices simultaneously. The CDM and tilted CDM models are then seen to fall below the APM data by a factor ~2 at θ = 1^deg^, where the observed w(θ) is still relatively large (~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(θ) amplitude that is 30%-40% too high on scales θ < 0.5^deg^ is predicted for the deepest slices (b_j_ ~ 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. Publication: The Astrophysical Journal Pub Date: September 1994 DOI: 10.1086/187499 Bibcode: 1994ApJ...432L..11Y Keywords: Angular Correlation; Astronomical Models; Cosmology; Dark Matter; Galactic Clusters; Astronomical Catalogs; Astronomical Photometry; Computerized Simulation; Error Analysis; Astrophysics; COSMOLOGY: DARK MATTER; COSMOLOGY: LARGE-SCALE STRUCTURE OF UNIVERSE; COSMOLOGY: THEORY; GALAXIES: CLUSTERING full text sources ADS |