Selection effects on X-ray and strong-lensing clusters in various cosmologies

Abstract

Galaxy clusters are hotter and more X-ray luminous than in quiescence while they undergo major mergers, which also transiently increase their strong-lensing efficiency. We use semi-analytic models for both effects to study how cluster dynamics in different dark-energy models affects the X-ray selected cluster population and its strong-lensing optical depth. We find that mergers increase the number of observable X-ray clusters by factors of a few and considerably broaden their redshift distribution. Strong-lensing optical depths are increased by a very similar amount. Quite independent of cosmology, X-ray bright clusters above a flux limit of $10^{-13.5}\mathrm{erg}{\mathrm{s}}^{-1}\mathrm{c}{\mathrm{m}}^{-2}$ produce $\sim 60$ of the strong-lensing optical depth, and only $\sim 1$ above a flux limit of $10^{-11.5}\mathrm{erg}{\mathrm{s}}^{-1}\mathrm{c}{\mathrm{m}}^{-2}$ if mergers are taken into account.

11 pages, 9 figures. Version accepted by A&A

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• Gravitational Lensing
• Strong lensing in the MareNostrum Universe: biases in the cluster lens population
• Observing the clustering properties of galaxy clusters in dynamical dark-energy cosmologies
• Arc Statistics
• Strong lensing statistics and the power spectrum normalisation
• The clustering of galaxy clusters in cosmological models with non-Gaussian initial conditions: Predictions for future surveys
• Strong lensing in the MareNostrum Universe II: scaling relations and optical depths