Effects of early dark energy on strong cluster lensing

Abstract

We use the semi-analytic method developed by Fedeli et al. for computing strong-lensing optical depths to study the statistics of gravitational arcs in four dark-energy cosmologies. Specifically, we focus on models with early dark energy and compare them to more conventional models. Merger trees are constructed for the cluster population because strong cluster lensing is amplified by factors of two to three during mergers. We find that the optical depth for gravitational arcs in the early dark-energy models is increased by up to a factor of about 3 compared to the other models because of the modified dynamics of cluster formation. In particular, the probability for gravitational arcs in high-redshift clusters is considerably increased, which may offer an explanation for the unexpectedly high lensing efficiency of distant clusters.

10 pages, 9 figures, accepted for publication on A&A

References in corpus (1)

• Cosmology and the Fate of Dilatation Symmetry

Cited by in corpus (13)

• Combining Strong and Weak Gravitational Lensing in Abell 1689
• Cluster Lenses
• CLASH: The Concentration-Mass Relation of Galaxy Clusters
• The Beginning and Evolution of the Universe
• The Highest Resolution Mass Map of Galaxy Cluster Substructure To Date Without Assuming Light Traces Mass: LensPerfect Analysis of Abell 1689
• The High Redshift Integrated Sachs-Wolfe Effect
• The strongest gravitational lenses: I. The statistical impact of cluster mergers
• Early Dark Energy at High Redshifts: Status and Perspectives
• Strong lensing statistics and the power spectrum normalisation
• Effects of the halo concentration distribution on strong-lensing optical depth and X-ray emission
• The SDSS Discovery of a Strongly Lensed Post-Starburst Galaxy at z=0.766
• Impact of early dark energy on the Planck SZ cluster sample
• Selection effects on X-ray and strong-lensing clusters in various cosmologies