NOAO >   Observing Info >   Approved Programs >   2014A-0467

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Proposal Information for 2014A-0467


PI: S. Mark Ammons, Lawrence Livermore National Laboratory, ammons1@llnl.gov
Address: Physics Department, 7000 East Ave., Livermore, CA 94450, USA

CoI: Kenneth C. Wong, EACOA - ASIAA/NAOJ
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 sources easier to detect but also reduces the volume surveyed, limiting the chance of detection. We have 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 have already used Suprime-Cam to identify arcs and improve constraints on the mass models in two beams. We propose imaging of two additional promising fields 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.


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