NOAO >   Observing Info >   Approved Programs >   2012A-0039

# Proposal Information for 2012A-0039

Address: Center for Astrophysics and Space Astronomy, 389 UCB, Boulder, CO 80309-0389, USA

CoI: John T. Stocke, University of Colorado
CoI: Steven V. Penton, University of Colorado
CoI: James C. Green, University of Colorado
CoI: Blair D. Savage, University of Wisconsin

Title: Gas and Galaxies in the Cosmic Web: A Galaxy Redshift Survey around \sl HST/COS Target Sight Lines

Abstract: The Cosmic Origins Spectrograph (COS) was installed aboard the \sl Hubble Space Telescope (\sl HST) in May 2009 and is functioning nominally. The unprecedented far-UV throughput of COS (20-30 times that of STIS at \mathcal R ~ 20,000) is revolutionizing studies of the local intergalactic medium (IGM). In particular, COS is allowing us to refine estimates of the baryon content and metallicity of the IGM, as well as the relationship of IGM absorbers to galaxies. Accordingly, the COS Science Team has allocated ~ 200 \sl HST orbits of GTO time to map the baryon content of the local Cosmic Web'' in gas and galaxies and is currently ~ 2/3 of the way through the GTO program. For the past four years, we have been obtaining HYDRA spectra of all galaxies brighter than g=20 with z_\rm photo < z_\rm AGN that are within 20\arcmin of the 39 AGN targeted by the COS Science Team. Our previous WIYN/HYDRA observations successfully obtain accurate redshifts for > 90% of g<=20 galaxies targeted, allowing an accurate galaxy census to L>=0.1 L^* for z\lesssim0.1. This semester, we propose to complete this spectroscopic campaign.

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

 NOAO >   Observing Info >   Approved Programs >   2012A-0039