NOAO >   Observing Info >   Approved Programs >   2006A-0461

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Proposal Information for 2006A-0461


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

CoI: Buell Jannuzi, NOAO

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

Abstract: We wish to use DEIMOS to complete a deep, wide-field galaxy survey towards quasar PG 1634+706 (V=14.9, z_em=1.334), which will be combined with our data for PKS 0232-040 (V=16.4 and z_em=1.450) and PG 0117+213 (V=16.0, z_em=1.493). We 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. PG 1634+706 has by far the highest signal-to-noise spectrum of any quasar in this crucial redshift range. Our deep galaxy survey will cover a region of ~ 9\times9 Mpc centered on each quasar sight line, with roughly 360 galaxy redshifts per field 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; (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 at z~3 persists to lower redshift. These 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. We were awarded time in July 2005 with DEIMOS for this proposal, but obtained no useful data owing to clouds and poor (5\arcsec) seeing. We request one night to observe the PG 1634+706 field which remains a uniquely well-studied sightline for IGM studies.


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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