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Galaxy Clusters in the Hubble Volume Simulations | | Joerg M. Colberg
; Simon D.M. White
; Thomas J. MacFarland
; Adrian Jenkins
; Carlos S. Frenk
; F.R. Pearce
; August E. Evrard
; H.M.P. Couchman
; George Efstathiou
; John A. Peacock
; Peter A. Thomas
; | | Date: |
24 Aug 1998 | | Subject: | astro-ph | | Abstract: | We report on analyses of cluster samples obtained from the Hubble Volume Simulations. These simulations, an $Omega=1$ model named $ au$CDM and a flat low $Omega$ model with a cosmological constant ($Lambda$CDM), comprise the largest computational efforts to date in numerical cosmology. We investigate the presence of massive galaxy clusters at $zapprox 0.8$. The $ au$CDM model fails to form clusters at such a redshift. However, due to the small number of observed clusters around $zapprox 0.8$ and the uncertainties in the determinations of their masses, this conclusion still is somewhat preliminary. We produce cluster catalogs at $z=0$ for both cosmologies and investigate their two--point correlation function $xi$. We show that the relationship between the mean density of subsamples of clusters, expressed via their mean separation $d_{
m c}$, and the correlation length $r_0$, defined through $xi(r_0) = 1$, is not linear but turns over gently for large $d_{
m c}$. An analytic prediction by Mo & White (1996) overpredicts $r_0$. The results from the analysis of the APM cluster data by Croft et al. (1997) are nicely matched by the $Lambda$CDM model. | | Source: | arXiv, astro-ph/9808257 | | Services: | Forum | Review | PDF | Favorites | |
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