Light Propagation in Inhomogeneous Universes. IV. Strong Lensing and Environmental Effects

Abstract

We study the gravitational lensing of high-redshift sources in a LCDM universe. We have performed a series of ray-tracing experiments, and selected a subsample of cases of strong lensing (multiple images, arcs, and Einstein rings). For each case, we identify a massive galaxy that is primarily responsible for lensing, and studied how the various density inhomogeneities along the line of sight (other galaxies, background matter) affect the properties of the image. The matter located near the lensing galaxy, and physically associated with it, has a small effect. The background matter increases the magnification by a few percents at most, while nearby galaxies can increase it by up to about 10 percent. The effect on the image separation is even smaller. The only significant effect results from the random alignment of physically unassociated galaxies, which can increase the magnification by factors of several, create additional images, and turn arcs into rings. We conclude that the effect of environment on strong lensing in negligible in general, and might be important only in rare cases. We show that our conclusion does not depend on the radial density profile of the galaxies responsible for lensing.

arXiv comment23 pages, 7 figures (one in color). Accepted for publication in The Astrophysical Journal. Minor typos corrected

References in corpus (19)

• A Universal Density Profile from Hierarchical Clustering
• Weak Gravitational Lensing
• The Power Spectrum Dependence of Dark Matter Halo Concentrations
• The Four-Year COBE Normalization and Large-Scale Structure
• A Gravitationally Lensed Quasar with Quadruple Images Separated by 14.62 Arcseconds
• The Properties of Poor Groups of Galaxies: III. The Galaxy Luminosity Function
• Gravitational Lensing By Spiral Galaxies
• Spectral Classification and Luminosity Function of Galaxies in the Las Campanas Redshift Survey
• Constraints on the Inner Mass Profiles of Lensing Galaxies from Missing Odd Images
• A model for the postcollapse equilibrium of cosmological structure: truncated isothermal spheres from top-hat density perturbations
• The Postcollapse Equilibrium Structure of Cosmological Haloes in a Low-Density Universe
• External Shear in Quadruply Imaged Lens Systems
• The Core Structure of Galaxy Clusters from Gravitational Lensing
• What Fraction of Gravitational Lens Galaxies Lie in Groups?
• Light Propagation in Inhomogeneous Universes I: Methodology and Preliminary Results
• The Dependence of the Galaxy Luminosity Function on Environment
• Light Propagation in Inhomogeneous Universes II. Cosmological Parameter Survey
• Morphological Evolution of Galaxies
• Lens Model Degeneracy and Cosmological Tests by Strong Gravitational Lensing

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• The impact of lens galaxy environments on the image separation distribution
• Testing a new analytic model for gravitational lensing probabilities
• Innocent Bystanders: Orbital Dynamics of Exomoons during Planet-Planet Scattering
• Lens Galaxy Environments and Anomalous Flux Ratios in Gravitational Lenses
• Density profile, velocity anisotropy and line-of-sight external convergence of SLACS gravitational lenses