NOAO >   Observing Info >   Approved Programs >   2012B-0482

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Proposal Information for 2012B-0482


PI: Casey Papovich, Texas A&M University, papovich@physics.tamu.edu
Address: Department of Physics and Astronomy, , 4242 TAMU, , College Station, TX, 77843-4242, USA

CoI: Ross McLure, Royal Observatory Edinburgh and ATC
CoI: Mark Dickinson, NOAO
CoI: Omar Almaini, University of Nottingham
CoI: Rebecca Bowler, Royal Observatory Edinburgh and ATC
CoI: Michele Cirasuolo, Royal Observatory Edinburgh and ATC
CoI: Emma Curtis-Lake, Royal Observatory Edinburgh and ATC
CoI: James Dunlop, Royal Observatory Edinburgh and ATC
CoI: Sandra Faber, UC Santa Cruz/Lick Observatory
CoI: Giovanni Fazio, Harvard-Smithsonian Center for Astrophysics
CoI: Harry Ferguson, STScI
CoI: Adriano Fontana, INFA-Roma
CoI: Steven Finkelstein, University of Texas at Austin
CoI: Mauro Giavalisco, University of Massachusetts, Amherst
CoI: Bahram Mobasher, UC Riverside
CoI: Laura Pentericci, INFA-Roma
CoI: Brett Salmon, Texas A&M University
CoI: Daniel Stark, University of Arizona (Astronomy)
CoI: Vithal Tilvi, Texas A&M University

Title: A Comprehensive Spectroscopic Survey of z > 4 Galaxies in CANDELS

Abstract: The basic statistical properties of galaxies at 4<z<7 have now been measured accurately using large samples of photometrically selected samples (e.g., Lyman-break galaxies). Making substantive progress now requires deep spectroscopy of these galaxies to deliver redshifts, stellar masses and star-formation rates (SFRs) accurate enough to test theoretical evolutionary paths of individual galaxies. We propose to obtain GMOS spectra of a magnitude limited, H(AB)<26.5, sample of 4.0<z<6.5 galaxies in the UDS and COSMOS CANDELS fields: these are two fields with very deep HST and Spitzer data over the largest areas. Our principal science goal is to measure redshifts of > 200 galaxies at 4<z<6.5, which allows us to measure with high accuracy their SFR/stellar-mass relation. Current observations show the SFR/stellar mass relation is constant at z>2, while theory predicts it should decline with decreasing redshift. We will refute (or confirm) this emerging contradiction. Our second main science goal is to measure accurately the evolving frequency of Ly-alpha emission in these galaxies as a measure of the rising cosmic hydrogen neutral fraction at increasing redshift. This is a resubmission of a 2011B proposal, which was highly ranked but not schedulable in the queue. It was recommended we reapply, requesting classical time, which we do here.


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