The evolution of clusters in the CLEF cosmological simulation: X-ray structural and scaling properties

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dc.creatorKay, Scott T.
dc.creatorda Silva, Antonio C.
dc.creatorAghanim, Nabila
dc.creatorBlanchard, Alain
dc.creatorLiddle, Andrew R.
dc.creatorPuget, Jean-Loup
dc.creatorSadat, Rachida
dc.creatorThomas, Peter A.
dc.date2006-11-01
dc.date2007-02-09
dc.date.accessioned2026-07-07T10:24:05Z
dc.date.available2026-07-07T10:24:05Z
dc.descriptionWe present results from a study of the X-ray cluster population that forms within the CLEF cosmological hydrodynamics simulation, a large N-body/SPH simulation of the Lambda CDM cosmology with radiative cooling, star formation and feedback. The scaled projected temperature and entropy profiles at z=0 are in good agreement with recent high-quality observations of cool core clusters, suggesting that the simulation grossly follows the processes that structure the intracluster medium (ICM) in these objects. Cool cores are a ubiquitous phenomenon in the simulation at low and high redshift, regardless of a cluster's dynamical state. This is at odds with the observations and so suggests there is still a heating mechanism missing from the simulation. Using a simple, observable measure of the concentration of the ICM, which correlates with the apparent mass deposition rate in the cluster core, we find a large dispersion within regular clusters at low redshift, but this diminishes at higher redshift, where strong "cooling-flow" systems are absent in our simulation. Consequently, our results predict that the normalisation and scatter of the luminosity-temperature relation should decrease with redshift; if such behaviour turns out to be a correct representation of X-ray cluster evolution, it will have significant consequences for the number of clusters found at high redshift in X-ray flux-limited surveys.
dc.description20 pages, 21 figures, MNRAS, accepted with minor modifications to original manuscript
dc.identifierhttps://arxiv.org/abs/astro-ph/0611017
dc.identifierhttp://arxiv.org/abs/astro-ph/0611017
dc.identifierMon.Not.Roy.Astron.Soc.377:317-334,2007
dc.identifierdoi:10.1111/j.1365-2966.2007.11605.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176065
dc.subjectAstrophysics
dc.titleThe evolution of clusters in the CLEF cosmological simulation: X-ray structural and scaling properties
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