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American Astronomical Society, Astrophysical Journal, 2(591), p. 741-748, 2003

DOI: 10.1086/375493

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Eccentricity Evolution in Simulated Galaxy Clusters

Journal article published in 2003 by Stephen N. Floor ORCID, Adrian L. Melott, Christopher J. Miller, Greg L. Bryan
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Strong cluster eccentricity evolution for $z \le 0.13$ 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 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. Comment: Revised version to be published in ApJ. Moderate revisions, including additional N-body simulations with varying amplitude normalization and background matter density within OCDM and $λ$CDM scenarios reinforce our conclusion that observed clusters have recently relaxed much more rapidly than simulated ones