Cluster-Galaxy Correlations in CDM Models

M. E. MERCHAN; M. G. ABADI; D. G. LAMBAS; C. A. VALOTTO

ASTROPHYSICAL JOURNAL

Año: 1998 p. 32 - 37

0004-637X

We study the ability of COBE-normalized CDM models to reproduce observed properties of the distribution of galaxies and clusters using N-body numerical simulations. We analyze the galaxy-galaxy and cluster-galaxy two-point correlation functions, $xi_{gg}$ and $xi_{cg}$, in open ($Omega_{0}=0.4, Omega_{Lambda}=0, sigma_8=0.75$), and flat ($Omega_{0}=0.3, Omega_{Lambda}=0.7, sigma_8=1.05$) CDM models which both reproduce the observed abundances of rich clusters of galaxies. To compare models with observations we compute projected cross-correlation functions $omega_{gg}$ and $omega_{cg}$ to derive the corresponding $xi_{gg}$ and $xi_{cg}$. We use target galaxies selected from Las Campanas Redshift Survey, target clusters selected from the APM Cluster Survey and tracer galaxies from the Edinburgh Durham Sky Survey catalog.