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P. Richter, B.D. Savage (Dept. of Astronomy, Univ. of Wisconsin, Madison), K.R. Sembach (Dept. of Physics and Astronomy, Johns Hopkins University, Baltimore), B.P. Wakker, M.R. Meade (Dept. of Astronomy, Univ. of Wisconsin, Madison), FUSE Science Team
We present an analysis of interstellar absorption lines in the FUSE spectrum of the low-redshift quasar PG\,0804\,+761 at intermediate resolution (FWHM~20 km\,s-1) in the interesting direction l=138.3, b=31.0. While the absorption pattern in the spectrum of PG\,0804\,+761 is dominated by absorption from local Galactic gas at 0 km\,s-1, we concentrate our study on absorption by neutral and ionized metals and molecular hydrogen related to the Low Latitude Intermediate Velocity Arch (LLIV Arch) in the lower Galactic halo at -60 km\,s-1 and on absorption from O\,{\sc vi} extended to negative velocities. For the LLIV Arch we derive gas-phase abundances of \approx 0.7 solar and a molecular hydrogen column density of 5.2 \times 1014 cm-2. Absorption by O\,{\sc vi} is extended to negative velocities as far as -100 km\,s-1. We speculate that the extended O\,{\sc vi} absorption represents highly ionized, hot gas situated above the Local arm and the Perseus arm.
The author(s) of this abstract have provided an email address for comments about the abstract: richter@astro.wisc.edu