Fold Lens Flux Anomalies: A Geometric Approach

Abstract

We develop a new approach for studying flux anomalies in quadruply-imaged fold lens systems. We show that in the absence of substructure, microlensing, or differential absorption, the expected flux ratios of a fold pair can be tightly constrained using only geometric arguments. We apply this technique to 11 known quadruple lens systems in the radio and infrared, and compare our estimates to the Monte Carlo based results of Keeton, Gaudi, and Petters. We show that a robust estimate for a flux ratio from a smoothly varying potential can be found, and at long wavelengths those lenses deviating from from this ratio almost certainly contain significant substructure.

16 pages, including 8 figures

References in corpus (8)

• The role of luminous substructure in the gravitational lens system MG 2016+112
• Radio, optical and infrared observations of CLASS B0128+437
• A Strong X-Ray Flux Ratio Anomaly in the Quadruply Lensed Quasar PG 1115+080
• Mass models and environment of the new quadruply lensed quasar SDSS J1330+1810
• Integral field spectroscopy of four lensed quasars: analysis of their neighborhood and evidence for microlensing
• Analytic Relations for Magnifications and Time Delays in Gravitational Lenses with Fold and Cusp Configurations
• Lensed Image Angles: New Statistical Evidence for Substructure
• Substructures in lens galaxies: PG1115+080 and B1555+375, two fold configurations

Cited by in corpus (8)

• Einstein rings modulated by wavelike dark matter from anomalies in gravitationally lensed images
• Gravitational microlensing of AGN dusty tori
• Analyzing the Flux Anomalies of the Large-Separation Lensed Quasar SDSS J1029+2623
• Signatures of Fuzzy Dark Matter Inside Radial Critical Curves
• Time Delay Anomalies of Fuzzy Gravitational Lenses
• Measurement of differential magnification
• Analytical Solutions of Singular Isothermal Quadrupole Lens
• Cusp Summations and Cusp Relations of Simple Quad Lenses