NOAO >   Observing Info >   Approved Programs >   2011A-0395

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Proposal Information for 2011A-0395


PI: Tim Rawle, University of Airzona, trawle@as.arizona.edu
Address: Steward Observatory, 933 North Cherry Avenue, Tucson, AZ 85721, USA

CoI: Eiichi Egami, University of Arizona
CoI: Marie Rex, University of Arizona
CoI: Carrie Bridge, Caltech
CoI: Greg Walth, University of Arizona

Title: Deep Wide-field Near-Infrared Imaging for the Herschel Lensing Survey

Abstract: ``The Herschel Lensing Survey'' (HLS; PI: E. Egami; 292.3 hrs) is imaging a sample of 44 massive galaxy clusters in five far-infrared bands 100-500 (mu)m. The goal is to surpass the nominal confusion- limited depth of Herschel observations by taking advantage of the gravitational lensing power of massive clusters. Our ability to accurately determine galaxy dust properties, and hence total infrared luminosity, from the Herschel SEDs is curtailed by the degeneracy between dust temperature and galaxy redshift. Near-infrared imaging via CTIO/NEWFIRM provides vital photometry at wavelengths relatively unaffected by dust, allowing tighter constraints on photometric redshifts for the Herschel-detected population, while also enabling us to measure the stellar mass of cluster and low-redshift sources. At the same time, the images give us the precise astrometry required for future NIR spectroscopy of the optically-faint high-redshift Herschel sources. Here, we propose four nights of observing to obtain J and K_\rm s band images for 10 HLS clusters. NEWFIRM's wide field of view is well matched to our SPIRE coverage, so only a single pointing is required per cluster.


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



NOAO >   Observing Info >   Approved Programs >   2011A-0395

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