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Eccentricity Evolution in Simulated Galaxy Clusters

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Stephen N. Floor1, Adrian L. Melott1, Christopher J. Miller2 and Greg L. Bryan3

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Strong cluster eccentricity evolution for z ≤ 0.13 has appeared in a variety of observational data sets. We examine the evolution of eccentricity in simulated galaxy clusters using a variety of simulation methodologies, amplitude normalizations, and background cosmologies. We do not find such evolution for z < 0.1 in any of our simulation ensembles. We suggest a systematic error in the form of a redshift-dependent selection effect in cluster catalogs or missing physics in cluster simulations important enough to modify the cluster morphology.


Subject headings

galaxies: clusters: general; large-scale structure of universe


Dates

Issue 2 (2003 July 10)

Received 2003 January 25, accepted for publication 2003 March 21



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