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We report on the observed properties of the plasma revealed through highsignal-to-noise (S/N) observations of 54 intervening O VI absorption systemscontaining 85 O VI and 133 H I components in a blind survey of 14 QSOs observedat ~18 km s-1 resolution with the Cosmic Origins Spectrograph (COS) over aredshift path of 3.52 at z < 0.5. Simple systems with one or two H I componentsand one O VI component comprise 50% of the systems. For a sample of 45well-aligned absorption components where the temperature can be estimated, wefind evidence for cool photoionized gas in 31 (69%) and warm gas (6 > log T >5) in 14 (31%) of the components. The total hydrogen content of the 14 warmcomponents can be estimated from the temperature and the measured value of logN(H I). The very large implied values of log N(H) range from 18.38 to 20.38with a median of 19.35. The metallicity, [O/H], in the 6 warm components withlog T > 5.45 ranges from -1.93 to 0.03 with a median value of -1.0 dex.Ground-based galaxy redshift studies reveal that most of the absorbers wedetect sample gas in the IGM extending 200 to 600 kpc beyond the closestassociated galaxy. We estimate the warm aligned O VI absorbers contain(4.1+/-1.1)% of the baryons at low z. The warm plasma traced by the aligned OVI and H I absorption contains nearly as many baryons as are found in galaxies.

The Properties of Low Redshift Intergalactic O VI Absorbers Determined from High S/N Observations of 14 QSOs with the Cosmic Origins Spectrograph