Astronomy and Astrophysics – Astronomy
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.2705r&link_type=abstract
American Astronomical Society, 196th AAS Meeting, #27.05; Bulletin of the American Astronomical Society, Vol. 32, p.714
Astronomy and Astrophysics
Astronomy
Scientific paper
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 vi extended to negative velocities. For the LLIV Arch we derive gas-phase abundances of ≈ 0.7 solar and a molecular hydrogen column density of 5.2 x 1014 cm-2. Absorption by O vi is extended to negative velocities as far as -100 km s-1. We speculate that the extended O vi absorption represents highly ionized, hot gas situated above the Local arm and the Perseus arm.
FUSE Science Team
Meade Marilyn R.
Richter Philipp
Savage Blair. D.
Sembach Kenneth Russell
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