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We present the first resolved mid-IR (11 micron) observations of thefour-image quasar lens H1413+117 using the Michelle camera on Gemini North. Allprevious observations (optical, near-IR, and radio) of this lens show a "fluxanomaly," where the image flux ratios cannot be explained by a simple, centrallens galaxy. We attempt to reproduce the mid-IR flux ratios, which areinsensitive to extinction and microlensing, by modeling the main lens as asingular isothermal ellipsoid. This model fails to reproduce the flux ratios.However, we can explain the flux ratios simply by adding to the model a nearbygalaxy detected in the H-band by HST/NICMOS-NIC2. This perturbing galaxy lies4.0" from the main lens and it has a critical radius of 0.63" +/- 0.02" whichis similar to that of the main lens, as expected from their similar H-bandfluxes. More remarkably, this galaxy is not required to obtain a good fit tothe system astrometry, so this represents the first clear detection of anobject through its effect on the image fluxes of a gravitational lens. This isa parallel to the detections of visible satellites from astrometric anomalies,and provides a proof of the concept of searching for substructure in galaxiesusing anomalous flux ratios.

Detection of a Companion Lens Galaxy using the Mid-infrared Flux Ratios of the Gravitationally Lensed Quasar H1413+117