ADAPTIVE OPTICS OBSERVATIONS OF B0128+437: A LOW-MASS, HIGH-REDSHIFT GRAVITATIONAL LENS
- Department of Physics, University of California Davis, 1 Shields Avenue, Davis, CA 95616 (United States)
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.
- OSTI ID:
- 21451074
- Journal Information:
- Astrophysical Journal Letters, Vol. 716, Issue 2; Other Information: DOI: 10.1088/2041-8205/716/2/L185; ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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