Journal
ASTROPHYSICAL JOURNAL
Volume 773, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/773/1/35
Keywords
galaxies: structure; gravitational lensing: strong
Categories
Funding
- Gemini Observatory [GN-2005B-Q-43]
- NASA through Space Telescope Science Institute [GO-7495]
- NASA [NAS5-2655]
- National Science Foundation [0645416]
- NSF [AST-1009756]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1009756, 0645416] Funding Source: National Science Foundation
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We present 11.2 mu m observations of the gravitationally lensed, radio-loud z(s) = 2.64 quasar MG0414+0534, obtained using the Michelle camera on Gemini North. We find a flux ratio anomaly of A2/A1 = 0.93 +/- 0.02 for the quasar images A1 and A2. When combined with the 11.7 mu m measurements from Minezaki et al., the A2/A1 flux ratio is nearly 5 sigma from the expected ratio for a model based on the two visible lens galaxies. The mid-IR flux ratio anomaly can be explained by a satellite (substructure), 0 ''.3 northeast of image A2, as can the detailed very long baseline interferometry (VLBI) structures of the jet produced by the quasar. When we combine the mid-IR flux ratios with high-resolution VLBI measurements, we find a best-fit mass between 10(6.2) and 10(7.5) M-circle dot inside the Einstein radius for a satellite substructure modeled as a singular isothermal sphere at the redshift of the main lens (z(l) = 0.96). We are unable to set an interesting limit on the mass to light ratio due to its proximity to the quasar image A2. While the observations used here were technically difficult, surveys of flux anomalies in gravitational lenses with the James Webb Space Telescope will be simple, fast, and should well constrain the abundance of substructure in dark matter halos.
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