NOAO >   Observing Info >   Approved Programs >   2009A-0326

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Proposal Information for 2009A-0326


PI: Holland Ford, Johns Hopkins University, ford@pha.jhu.edu
Address: Department of Physics and Astronomy, 3400 N. Charles Street, Bloomberg Center Baltimore, MD 21218, USA

CoI: Wei Zheng, Johns Hopkins University
CoI: Larry Bradley, Johns Hopkins University
CoI: Thomas Broadhurst, Tel-Aviv University, Israel

Title: Spectroscopy of an Exceptionally Bright Candidate Galaxy at z 6 in Abell 1703

Abstract: We have discovered a close pair of bright i-dropout candidates, which we call A1703-iD1, in the HST/ACS, Gemini-N/NIRI, and HST/NICMOS images of Abell 1703. This object was found as a result of our extensive search for high-z galaxies in clusters over a sky area comparable to GOODS. A1703-iD1, with a combined magnitude of AB(z850)=23.9 and a photometric redshift of 6.1, may be the brightest high-z galaxy known to date, corresponding to an unmagnified galaxy with luminosity 10 L*. The GMOS spectrum will enable us to search for emission and absorption features in A1703-iD1, and compare them with those at lower redshifts to study the evolution of the metallicity in the gas ejected by the stars in extremely young galaxies. During the long exposure of our main target, we will also obtain 35 spectra of spectacular arcs in the cluster field. These spectra will enable us to improve our mass model to map the dark matter in this cluster. We were granted time in 2008A, but the observations were not carried out.


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 >   2009A-0326

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