Near Infrared Imaging with the Keck Telescope of Gravitational Lens Systems

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Session 76 -- Keck
Oral presentation, Thursday, 2:30-4:00, Dwinelle 155 Room

[76.04] Near Infrared Imaging with the Keck Telescope of Gravitational Lens Systems

G. Neugebauer, K. Matthews, S. Djorgovski (Caltech), J. R. Graham (U. C. Berkeley), W. Harrison (CARA), G. Jernigan (U. C. Berkeley), J. E. Larkin, C. R. Lawrence, S. Lin (Caltech), J. Nelson (U. C. Berkeley), G. Smith (CARA), B. T. Soifer, C. Ziomkowski (Caltech)

Images of two gravitational lens systems, MG1131+0456, B1422+231, and one suspected lens system 1634+267, were obtained using the near infrared camera on the Keck 10m telescope. The camera uses a 256 by 256 element InSb array with a field of 38'' x 38''. The images were taken with good angular resolution ($\sim$0.6'' to $\sim$0.9'') and stellar images were well sampled with a scale of 0.15'' per pixel.

The three systems were all imaged in the 2.0$\mu$m - 2.3$\mu$ band and MG1131+0456 was also imaged in the J, 1.1$\mu$m - 1.4$\mu$m band. The two main components of MG1131+0456 are extremely red and the morphology of the system changes dramatically between 1.2 and 2.2 $\mu$m. For the 1634+267 system, our image is much deeper than any previous observations, yet we were still unable to detect a central lensing object. Images of all three systems and the surrounding fields will be presented and their implications discussed.

\bf Acknowledgements \rm

The W. M. Keck Observatory is a scientific partnership between the California Institute of Technology and the University of California. It was made possible by the generous gift of the W. M. Keck foundation, and the support of its president, Howard Keck. We are most grateful for their visionary endowment that has made possible the first of the next generation of telescopes. It is a pleasure to also thank all of the many devoted people whose unflagging efforts have made possible the success of the W. M. Keck Observatory.

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