Fold Lens Flux Anomalies: A Geometric Approach

Details Fold Lens Flux Anomalies: A Geometric Approach Fold Lens Flux Anomalies: A Geometric Approach

2009-12-04

arxiv.org/abs/0912.0916v2

Astrophysical Journal (2010) 715, 793

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

16 pages, including 8 figures

Scientific paper

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.

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