NOAO >   Observing Info >   Approved Programs >   2013A-0496

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Proposal Information for 2013A-0496


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 recent work has shown that lines of sight 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 integrated luminosity densities of luminous red galaxies. Galaxy spectroscopy reveals that many contain multiple cluster-scale halos and larger integrated masses than even known strong lensing clusters. However, the derived mass models lack constraints on the shapes and concentrations of these halos, preventing a precise determinatio n 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. \bf This project has just 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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