NOAO >   Observing Info >   Approved Programs >   2011B-0440

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Proposal Information for 2011B-0440


PI: Jennifer Scott, Towson University, jescott@towson.edu
Address: Department of Physics, Astronomy, and Geosciences, Smith Hall 445, Towson, MD 21252, USA

CoI: Gerard Kriss, Space Telescope Science Institute
CoI: J. Michael Shull, University of Colorado at Boulder
CoI: Lutz Wisotzki, Astrophysical Institute Potsdam
CoI: Rob Simcoe, Massachusetts Institute of Technology
CoI: Gabor Worseck, University of California at Santa Cruz
CoI: Cora Fechner, University of Potsdam

Title: Galaxies and AGN in the Field of the UV Bright QSO HE2347-4342

Abstract: Understanding the reionization of intergalactic \heii is one of the primary science drivers for the \it Cosmic Origins Spectrograph (COS) on HST. Recently published GTO data of the \heii \lya forest along with high resolution optical spectra have yielded a very accurate sightline map of the fluctuating \heii to \hi column density ratio (\eta) to the z=2.885 QSO HE2347-4342. Underlying these \eta fluctuations are variations in the softness of the ionizing radiation field. We propose multi-object spectroscopy with GMOS-S to determine \underlinedirectly whether specific \eta variations correspond with star-forming galaxies or AGN, i.e. soft or hard ionizing sources, in the quasar field. The presence or absence of a correlation will provide new constraints for hydrodynamic models of \heii reionization. The spectroscopic targets are drawn from a sample of photometrically preselected galaxy and AGN candidates in the field, derived from previous GMOS-S data.


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NOAO >   Observing Info >   Approved Programs >   2011B-0440

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