NOAO >   Observing Info >   Approved Programs >   2003B-0166

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Proposal Information for 2003B-0166


PI: Karl Glazebrook, Johns Hopkins University, kgb@pha.jhu.edu
Address: Department of Physics and Astronomy, 3400 N Charles St, Baltimore, MD,, 21218, USA

CoI: Patrick McCarthy, Carnegie Institution of Washington (Carnegie Obs.)
CoI: Sandra Savaglo, Johns Hopkins University
CoI: Roberto Abraham, University of Toronto
CoI: David Crampton, Herzberg Institute of Astrophysics
CoI: Isobel Hook, University of Oxford
CoI: Andrew Bunker, University of Cambridge
CoI: Elizabeth Stanway, University of Cambridge
CoI: Warrick Couch, University of New South Wales
CoI: Kathy Roth, Gemini Observatory - North
CoI: Rick Murowinski, Herzberg Institute of Astrophysics
CoI: Inger Jorgensen, Gemini Observatory - North
CoI: James Rhoads, Space Telescope Science Institute
CoI: Sangeeta Malhotra, Space Telescope Science Institute
CoI: Matthew Colless, Australian National University
CoI: Zlatan Tsvetanov, Johns Hopkins University

Title: The First Galaxies: a long, hard look

Abstract: We wish to take advantage of the scientifc opportunity offered by the forthcoming HST/ACS Ultra-Deep Field to measure accurately the abundance and luminous properties of faint 5.5<z<7 galaxies for the first time. We propose to observe up to 100 `i-dropout' objects selected from the UDF in an ultra-deep 100 hour GMOS spectroscopic exposure to search for faint Ly-alpha emission lines using nod & shuffle. Lyman-alpha emission lines can be detected in objects as faint as z'=28-29, i.e. to the very limits of the UDF. This will be the deepest spectroscopic look at the high-redshift Universe so far. It will enable us to measure detailed properties of the first, primordial galaxy population and allow us to test for the signature of re- ionization in the redshift evolution of the galaxy luminosity function. Re-ionization near z=6 is controversial, this will be the first independent test of this picture. Because of the extreme depth nod & shuffle is required, only Gemini/GMOS can attempt this.


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