Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/224993

Title

Adaptive optics observations of B0128+437: a low-mass, high-redshift gravitational lens

Author(s)

Lagattuta, David J.;  Auger, Matthew W.;  Fassnacht, Christopher D.

Abstract

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.

Publication type

Journal article

Source

Astrophysical Journal Letters, Vol. 716, no. 2, part 2 (Jun 2010), pp. L185-L189

Publication year

2010

FOR Code(s)

0201 Astronomical and Space Sciences;  0305 Organic Chemistry;  0306 Physical Chemistry (Incl. Structural)

Keyword(s)

CLASS B0128+437;  Galaxies;  Gravitational lensing;  High-redshift galaxies;  Infrared

Publisher

Institute of Physics Publishing

ISSN

2041-8205

Publisher URL

http://dx.doi.org/10.1088/2041-8205/716/2/l185

Copyright

Copyright © 2010 The American Astronomical Society. All rights reserved. The American Astronomical Society does not allow Swinburne Research Bank to archive either the accepted manuscript or the published version of the article. However you can find an earlier version of the full text here: http://arxiv.org/abs/0912.2344

Peer reviewed