The impact of lens galaxy environments on the image separation distribution

Abstract

We study the impact of lens galaxy environments on the image separation distribution of lensed quasars. We account for both environmental convergence and shear, using a joint distribution derived from galaxy formation models calibrated by galaxy-galaxy lensing data and number counts of massive elliptical galaxies. We find that the external field enhances lensing probabilities, particularly at large image separations; the increase is ~30% at θ=3'' and ~200% at θ=5'', when we adopt a power-law source luminosity function Φ(L) \propto L^-2.1. The enhancement is mainly driven by convergence, which boosts both the image separation and magnification bias (for a fixed lens galaxy mass). These effects have been neglected in previous studies of lens statistics. Turning the problem around, we derive the posterior convergence and shear distributions and point out that they are strong functions of image separation; lens systems with larger image separations are more likely to lie in dense environments.

8 pages, 10 figures, accepted for publication in MNRAS

References in corpus (8)

• The Evolution and Structure of Early-type Field Galaxies: A Combined Statistical Analysis of Gravitational Lenses
• The Importance of Lens Galaxy Environments
• Discovery of Two Gravitationally Lensed Quasars with Image Separations of 3 Arcseconds from the Sloan Digital Sky Survey
• The Lens Redshift and Group Environment for HE 0435-1223
• CLASS B2108+213: A new wide separation gravitational lens system
• A search for clusters and groups of galaxies on the line of sight towards 8 lensed quasars
• Constraints on Velocity Dispersion Function of Early-type Galaxies from the Statistics of Strong Gravitational Lensing
• Light Propagation in Inhomogeneous Universes. IV. Strong Lensing and Environmental Effects

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