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Galaxy clusters and cold dark matter - A low-density unbiased universe?
Bahcall, Neta A.; Cen, Renyue
AA(Princeton Univ. Observatory, NJ), AB(Princeton Univ. Observatory, NJ)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 398, no. 2, p. L81-L84. (ApJL Homepage)
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NASA/STI Keywords:
Astronomical Catalogs, Astronomical Models, Dark Matter, Galactic Clusters, Background Radiation, Cosmic Background Explorer Satellite, Microwave Spectra
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Large-scale simulations of a universe dominated by cold dark matter (CDM) are tested against two fundamental properties of clusters of galaxies: the cluster mass function and the cluster correlation function. We find that standard biased CDM models are inconsistent with these observations for any bias parameter b. A low-density, low-bias CDM-type model, with or without a cosmological constant, appears to be consistent with both the cluster mass function and the cluster correlations. The low-density model agrees well with the observed correlation function of the Abell, Automatic Plate Measuring Facility (APM), and Edinburgh-Durham cluster catalogs. The model is in excellent agreement with the observed dependence of the correlation strength on cluster mean separation, reproducing the measured universal dimensionless cluster correlation. The low-density model is also consistent with other large-scale structure observations, including the APM angular galaxy-correlations, and for lambda = 1-Omega with the COBE results of the microwave background radiation fluctuations.

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