Morphology and evolution of simulated and optical clusters: a comparative analysis
Abstract
We have made a comparative study of morphological evolution in simulated dark matter (DM) haloes and X-ray brightness distribution, and in optical clusters. Samples of simulated clusters include star formation with supernovae feedback, radiative cooling and simulation in the adiabatic limit at three different redshifts, z = 0.0, 0.10 and 0.25. The optical sample contains 208 Abell, Corwin & Olowin (ACO) clusters within redshift, z ≤ 0.25. Cluster morphology, within 0.5 and 1.0 h⁻¹ Mpc from cluster centre, is quantified by multiplicity and ellipticity. We find that the distribution of the DM haloes in the adiabatic simulation appears to be more elongated than the galaxy clusters. Radiative cooling brings halo shapes in excellent agreement with observed clusters; however, cooling along with feedback mechanism makes the haloes more flattened. Our results indicate relatively stronger structural evolution and more clumpy distributions in observed clusters than in the structure of simulated clusters, and slower increase in simulated cluster shapes compared to those in the observed one. Within z ≤ 0.1, we note an interesting agreement in the shapes of clusters obtained from the cooling simulations and observation. We also note that the different samples of observed clusters differ significantly in morphological evolution with redshift. We highlight a few possibilities responsible for the discrepancy in morphological evolution of simulated and observed clusters.
Additional Information
© 2006 RAS. Accepted 2005 December 16. Received 2005 December 08; in original form 2005 May 12. We thank the anonymous referee for constructive comments and criticisms which helped us improve the quality of this paper. We thank M. Plionis for providing the APM cluster ellipticity data and Scott W. Chambers for the MCM data sets. NR thanks Hume Feldman and Bruce Twarog for many useful discussions.Attached Files
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Accepted Version - 0512647.pdf
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- CaltechAUTHORS:20201204-154217533
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2020-12-09Created from EPrint's datestamp field
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2021-11-16Created from EPrint's last_modified field