Strong lensing by cluster-sized haloes in dark-energy cosmologies

Abstract

We study the efficiency of numerically simulated galaxy clusters for producing strong gravitational lensing events in different dark-energy cosmologies with constant and time-variable equation of state and we compare it with ``standard'' $\Lambda$CDM and OCDM models. Our main results are that: (1) the expected abundance of gravitational arcs with large length-to-width ratio depends on the equation of state of dark energy at the epoch of formation of the halo; (2) as found in previous studies, the strong lensing cross section of galaxy clusters is very sensitive to dynamical processes like mergers, whose impact however is different for different cosmologies, being stronger for models in which halos are less concentrated. As expected, the largest differences in the lensing optical depth occur at moderate and high redshift.

arXiv comment10 pages, 6 figures, submitted to A&A

References in corpus (9)

• The Cosmological Constant and Dark Energy
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• The Microwave Anisotropy Probe (MAP) Mission
• Numerical study of halo concentrations in dark-energy cosmologies
• The Robustness of Quintessence
• Properties of cluster satellites in hydrodynamical simulations
• Giant cluster arcs as a constraint on the scattering cross-section of dark matter
• Effects of cluster galaxies on arc statistics
• Arc Statistics in Cosmological Models with Dark Energy

Cited by in corpus (12)

• Cluster Lenses
• Observational constraints on low redshift evolution of dark energy: How consistent are different observations?
• Cosmological structure formation in a homogeneous dark energy background
• Is the Number of Giant Arcs in LCDM Consistent With Observations?
• Effects of Strong Gravitational Lensing on Millimeter-Wave Galaxy Number Counts
• Evolution of dark-matter haloes in a variety of dark-energy cosmologies
• The Lensed Arc Production Efficiency of Galaxy Clusters: A Comparison of Matched Observed and Simulated Samples
• Probing Dark Energy at Galactic and Cluster Scales
• Strong Gravitational Lensing and Dynamical Dark Energy
• Cluster arc statistics
• Statistics of Quasars Multiply Imaged by Galaxy Clusters
• Dark Energy Simulations