Selection effects on X-ray and strong-lensing clusters in various cosmologies
Zentrum für Astronomie, ITA, Universität Heidelberg, Albert-Überle-Str. 2, 69120 Heidelberg, Germany e-mail: firstname.lastname@example.org
Accepted: 31 July 2007
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 produce ~ of the strong-lensing optical depth, and only ~ above a flux limit of if mergers are taken into account.
Key words: X-rays: galaxies: clusters / gravitational lensing / dark matter / galaxies: clusters: general
© ESO, 2007