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

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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 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's < z_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 ≲ 0.3. These data, along with intergalactic Lyα 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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