Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 716, Issue 2, Pages L185-L189Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/716/2/L185
Keywords
galaxies: high-redshift; galaxies: individual (CLASS B0128+437); gravitational lensing: strong; infrared: galaxies
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Funding
- NSF [NSF-AST-0909119]
- W. M. Keck Foundation
- Science and Technology Facilities Council [ST/H00243X/1] Funding Source: researchfish
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We use high-resolution adaptive optics (AO) imaging on the Keck II telescope to study the gravitational lens B0128+437 in unprecedented detail, allowing us to resolve individual lensed quasar components and, for the first time, detect and measure properties of the lensing galaxy. B0128+437 is a small-separation lens with known flux-ratio and astrometric anomalies. We discuss possible causes for these anomalies, including the presence of substructure in the lensing galaxy, propagation effects due to dust and a turbulent interstellar medium, and gravitational microlensing. This work demonstrates that AO will be an essential tool for studying the many new small-separation lenses expected from future surveys.
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