NOAO >   Observing Info >   Approved Programs >   2008A-0086

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Proposal Information for 2008A-0086


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 HST in August, 2008. 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), its baryon content, metallicity, and relationship to galaxies. The COS Science Team has allocated ~ 200 HST orbits of GTO time to map the baryon content of the local Universe in galaxies and gas...the ``Cosmic Web''. We propose to acquire HYDRA spectra of all galaxies brighter than g=20 with photo-z\rm 's < z_\rm AGN that are within 20\arcmin of the 39 AGN targeted by the COS Science Team. This makes our survey complete to L < L^* for z \lesssim 0.3. These data, along with intergalactic \lya and metal-line absorbers discovered in the COS far- UV spectra, will allow us to assess the extent of metal transport from galaxies, the filling factor of metal-enriched gas in filaments, and the metallicity of gas in voids. Multi-filter MOSAIC images are required for 18 of our 39 sight lines to select spectroscopic targets (the other 21 sight lines have SDSS imaging available).


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