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Cluster-cluster clusteringThe cluster correlation function xi sub c(r) is compared with the particle correlation function, xi(r) in cosmological N-body simulations with a wide range of initial conditions. The experiments include scale-free initial conditions, pancake models with a coherence length in the initial density field, and hybrid models. Three N-body techniques and two cluster-finding algorithms are used. In scale-free models with white noise initial conditions, xi sub c and xi are essentially identical. In scale-free models with more power on large scales, it is found that the amplitude of xi sub c increases with cluster richness; in this case the clusters give a biased estimate of the particle correlations. In the pancake and hybrid models (with n = 0 or 1), xi sub c is steeper than xi, but the cluster correlation length exceeds that of the points by less than a factor of 2, independent of cluster richness. Thus the high amplitude of xi sub c found in studies of rich clusters of galaxies is inconsistent with white noise and pancake models and may indicate a primordial fluctuation spectrum with substantial power on large scales.
Document ID
19850064282
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Barnes, J.
(California, University Berkeley, United States)
Dekel, A.
(California, University Berkeley and Santa Barbara; Yale University, New Haven, CT, United States)
Efstathiou, G.
(California, University Santa Barbara; Cambridge University, United Kingdom)
Frenk, C. S.
(California, University Berkeley and Santa Barbara; Sussex, University, Brighton, United Kingdom)
Date Acquired
August 12, 2013
Publication Date
August 15, 1985
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 295
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
85A46433
Funding Number(s)
CONTRACT_GRANT: NSF AST-81-14715
CONTRACT_GRANT: NSF PHY-77-27084
Distribution Limits
Public
Copyright
Other

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