NOAO >   Observing Info >   Approved Programs >   2009B-0392

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Proposal Information for 2009B-0392


PI: Buell T. Jannuzi, NOAO, jannuzi@noao.edu
Address: KPNO, 950 N. Cherry Ave., Tucson, AZ 85719, USA

CoI: Jill Bechtold, University of Arizona
CoI: Allison Strom, University of Arizona
CoI: Neil Crighton, University of Durham
CoI: Simon Morris, University of Durham
CoI: Romeel Dave, University of Arizona

Title: Comparing the Distribution of the IGM and Galaxies using a Triple QSO System

Abstract: We propose to use DEIMOS (Keck II) to map the large-scale distribution of galaxies from 0.2<z<1.0 toward a group of three QSOs. The QSOs all have z_\rm em~1 and exisiting UV spectra from HST covering their Ly-(alpha) forest region at z<1. In addition, we have 72 orbits of COS+HST time scheduled to study these quasars at high spectral resolution. The unusual combination of three closely-spaced sight-lines allows us to simultaneously constrain the size and geometry of gas over-densities in the IGM, not possible with only one or two QSO sight-lines. The sight-lines have separations of ~400 kpc to ~1 Mpc, probing the expected scales of gas over-densities. The DEIMOS observations will map out the distribution of galaxies out to 5 Mpc from the sight-lines to the QSOs, placing in proper context our map of the large-scale structure in this volume. Understanding the relationship between the gaseous and luminous matter is fundamental to our understanding of galaxy evolution. We will use our study in conjunction with existing observations at both higher and lower redshifts and state-of-the-art cosmological simulations to provide a more comprehensive examination of the evolution of the relationship between the IGM and galaxies over the majority of the age of the Universe. Last fall we were awarded one night with DEIMOS but obtained only one hour of useful data, due to clouds.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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