NOAO >   Observing Info >   Approved Programs >   2009A-0207

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Proposal Information for 2009A-0207


PI: Brian A. Keeney, Univ. of Colorado, brian.keeney@colorado.edu
Address: CASA, 389 UCB, Boulder, CO 80309-0389, USA

CoI: John T. Stocke, Univ. of Colorado
CoI: Steven V. Penton, Univ. of Colorado
CoI: James C. Green, Univ. of Colorado

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

Abstract: The Cosmic Origins Spectrograph (COS) will be installed aboard the Hubble Space Telescope (HST) in 2009. The unprecedented far-UV throughput of COS (20-30 times that of STIS at \rm R ~ 20,000) will revolutionize many studies, including the investigation of the local intergalactic medium (IGM). In particular, COS will allow 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 HST orbits of GTO time to map the baryon content of the local ``Cosmic Web'' in gas and galaxies. In 2008, we began to obtain 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. This semester, we propose to continue this spectroscopic campaign, as well as finish our multi-filter MOSAIC imaging for sight lines that are not covered by the Sloan Digital Sky Survey. We will calculate photometric redshifts for all galaxies in these images to target those galaxies with z_\rm photo < z_\rm AGN for follow-up spectroscopy in later semesters.


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