0 Assigned ID: 1133 ----- Attempting Submission 1 (Fri Apr 11 23:58:37 GMT 2014) ----- We request funding to perform a dedicated survey and analysis of the HST archive of COS-G130M quasar spectra to construct an absorption-line catalog tuned to study the environment (i.e. large-scale structure, LSS) of the intergalactic medium (IGM). Specifically, we will characterize the HI Lyman series absorption at z<0.1 and associate metals for all absorbers along 100 quasar sightlines penetrating the SDSS footprint. Using standard line-profile fitting techniques, we will recover HI column densities and Doppler parameters. These will be publicly released in a database that includes spectral masks identifying spurious spectral features, regions biased by previously known systems, etc. This catalog will be analyzed in conjunction with the suite of LSS catalogs generated from the SDSS footprint (e.g. clusters, groups), with emphasis on new algorithms designed to identify and characterize galaxy voids. Through this analysis, we will test the predictions from our cosmological paradigm that the IGM traces a so-called cosmic web of LSS. QUASAR ABSORPTION LINES AND IGM Default Medium false true false false false SUPPORTED