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We present a detection of a broad Ly-alpha absorber (BLA) with a matching OVI line in the nearby universe. The BLA is detected at z = 0.01028 in the highS/N spectrum of Mrk 290 obtained using the Cosmic Origins Spectrograph. TheLy-alpha absorption has two components, with b(HI) = 55 +/- 1 km/s and b(HI) =33 +/- 1 km/s, separated in velocity by v ~ 115 km/s. The O VI, detected byFUSE at z = 0.01027, has a b(OVI) = 29 +/- 3 km/s and is kinematically wellaligned with the broader HI component. The different line widths of the BLA andOVI suggest a temperature of T = 1.4 x 10^5 K in the absorber. The observedline strength ratios and line widths favor an ionization scenario in which bothion-electron collisions and UV photons contribute to the ionization in the gas.Such a model requires a low-metallicity of -1.7 dex, ionization parameter oflog U ~ -1.4, a large total hydrogen column density of N(H) ~ 4 x 10^19 cm^-2,and a path length of 400 kpc. The line of sight to Mrk 290 intercepts at theredshift of the absorber, a megaparsec scale filamentary structure extendingover 20 deg in the sky, with several luminous galaxies distributed within 1.5Mpc projected distance from the absorber. The collisionally ionized gas in thisabsorber is likely tracing a shock-heated gaseous structure, consistent with afew different scenarios for the origin, including an over-dense region of theWHIM in the galaxy filament or highly ionized gas in the extended halo of oneof the galaxies in the filament. In general, BLAs with metals provide anefficient means to study T ~ 10^5 - 10^6 K gas in galaxy halos and in theintergalactic medium. A substantial fraction of the baryons "missing" from thepresent universe is predicted to be in such environments in the form of highlyionized plasma.

Cosmic Origins Spectrograph and FUSE Observations of T ~ 10^5 K Gas In A Nearby Galaxy Filament