NOAO >   Observing Info >   Approved Programs >   2013B-0458

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Proposal Information for 2013B-0458


PI: Kenneth C. Wong, University of Arizona, kwong@as.arizona.edu
Address: Astronomy Department, 933 N. Cherry Ave., Tucson, AZ 85721, USA

CoI: S. Mark Ammons, Lawrence Livermore National Laboratory
CoI: Ann I. Zabludoff, University of Arizona
CoI: Charles R. Keeton, Rutgers University
CoI: K. Decker French, University of Arizona
CoI: Curtis McCully, Rutgers University

Title: Studying the Most Powerful Gravitational Lens Telescopes with Subaru/Suprime-Cam

Abstract: Detecting the earliest galaxies at z > 7 is a major challenge in observational cosmology. Past studies have required a large investment of HST time and have only found a few high-z candidates. Gravitational lensing by a foreground galaxy cluster can make a distant source easier to detect but also reduces the volume surveyed, limiting the chance of detection. Our work has shown that fields containing multiple cluster- scale halos in projection can increase the lensing cross section, allowing one to probe further down the luminosity function. \it We have identified lines-of-sight in the Sloan Digital Sky Survey with the highest densities of luminous red galaxies. Galaxy spectroscopy reveals that many contain multiple cluster-scale halos and larger integrated masses than even known lensing clusters. However, our derived mass models lack constraints on the shapes and concentrations of these halos, preventing a precise determination of the 2-D magnification map. We propose to use Subaru/Suprime-Cam to image three of the beams to identify multiply imaged sources at z ~ 1-3 and determine photometric redshifts, which will provide the necessary constraints and set the stage for measuring the faint-end luminosity function at z > 7. We were awarded Subaru/Suprime-Cam time in 2013A for this purpose but lost our observing night due to technical problems with Subaru. \bf This project has been funded for the next three years by the NSF.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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