Highly Ionized Gas in High Velocity Clouds - The PG 1259+593 Sight Line through Complex C

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We present FUSE and STIS observations of highly ionized gas associated with Complex C, along the line of sight towards PG 1259+593. We compare medium resolution (FWHM ~ 20 km/s) FUSE spectra of OVI with STIS observations (FWHM ~ 7 km/s) of CIV and SiIV. We also examine the inter-relationships between these high ions and some low ionization species, namely OI, SiII, and CII. We find that the high ion absorption can be modeled by absorption components at similar velocities to those seen in the neutral gas. The observed ionic ratios are consistent with the production of CIV, SiIV and OVI in one or more conductive interfaces centered at Complex C velocities. In this scenario we envisage the production of OVI in transition-temperature (T~3x105 K) gas at the interface between the neutral component of Complex C and a surrounding hot medium.

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