NOAO >   Observing Info >   Approved Programs >   2003B-0317

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Proposal Information for 2003B-0317


PI: Jill Bechtold, Steward Observatory, jill@as.arizona.edu
Address: University of Arizona, 933 N. Cherry Ave., Tucson, AZ 85721, USA

CoI: Buell Jannuzi, NOAO

Title: The IGM and the Distribution of Galaxies at \bf z~1

Abstract: We propose to carry out a deep, wide-field galaxy survey towards two intermediate-redshift quasars, PKS 0232-040 (V=16.4 and z_em=1.450) and PG 0117+213 (V=16.0, z_em=1.493), to combine with our GMOS data for a third quasar, PG 1634+706 (V=14.9, z_em=1.334). We have obtained high signal-to-noise echelle spectra of these quasars with HST/STIS, in order to study the Ly(alpha) forest and metal absorbers in detail. Our deep galaxy survey will cover a region of ~ 9\times9 Mpc centered on the quasar sight line, with roughly 360 galaxy redshifts per field expected with z=0.5 - 1.3. With this sample we will (1) identify the galaxies giving rise to several complex CIV/MgII/OVI absorption line systems at z=0.3-1.0; (2) map the large scale galaxy distribution so that we can look for correlations between galaxy cluster structures and the clusters of weak Lyman forest clouds we see in the UV spectrum; (3) test predictions of hydrodynamic simulations of LSS growth, and the physics of galaxy feedback; and (4) determine whether the observed correlation between the density of the IGM and the density of galaxies on ~10 Mpc scales claimed recently at z~3 persists to lower redshift. These three quasars are part of our comprehensive survey of quasar absorbers at echelle resolution for redshifts z=0.5- 2. Our survey bridges the gap between the z=2-6 absorbers observed from the ground, and the z<0.3 low redshift systems previously studied with HST and FUSE.


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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