PI: Alice Shapley, Princeton University, firstname.lastname@example.org
Address: Department of Astrophysical Sciences, Princeton University, Peyton Hall -- Ivy Lane, Princeton, NJ 08544, USA
CoI: Max Pettini, Institute of Astronomy, Cambridge
CoI: Dawn Erb, Harvard-Smithsonian Center for Astrophysics
CoI: Charles Steidel, California Institute of Technology
Title: Physical Conditions, Dust Extinction, and Chemical Abundances in Star- forming Galaxies at z~ 2.0-2.5
Abstract: We propose to obtain GNIRS observations of rest-frame optical emission lines including [OII], H(beta), [OIII], H(alpha), [NII], and [SII] for 10 galaxies at 2.0<=z < 2.5, drawn from the largest spectroscopic sample of star-forming galaxies in that redshift range. This proposal serves as a continuation of our approved 2005B program, for which we are about to obtain data. The 10 target objects already have precise Keck II/NIRSPEC H(alpha) redshifts and fluxes, which are essential for demonstrating the feasibility of GNIRS follow-up. The proposed GNIRS data will play a key role in the study of these galaxies because only with GNRIS can we \it simultaneously measure the full set of rest-frame optical emission lines spanning in wavelength from [OII] to [SII]. This special capability of GNIRS will reveal the physical conditions, dust extinction, and chemical abundances in high-redshift H II regions to an unprecedented degree of detail. These observations will provide a new window into galaxy formation, during a critical epoch that hosts the peak of AGN and star-formation activity, and the emergence of the most massive galaxies in the universe.
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