We present far-ultraviolet spectra of the Seyfert 1 galaxy Mrk 509 obtained in 1999 November with the Far Ultraviolet Spectroscopic Explorer ( FUSE ) .
Our data span the observed wavelength range 915–1185 Å at a resolution of \sim 20 ~ { } { km s } ^ { -1 } .
The spectrum shows a blue continuum , broad O vi \lambda \lambda 1032 , 1038 emission , and a broad C iii \lambda 977 emission line .
Superposed on these emission components , we resolve associated absorption lines of O vi \lambda \lambda 1032 , 1038 , C iii \lambda 977 , and Lyman lines through L \zeta .
Seven distinct kinematic components are present , spanning a velocity range of -440 ~ { } to + 170 ~ { } { km s } ^ { -1 } relative to the systemic velocity .
The absorption is clustered in two groups , one centered at -370 ~ { } km s ^ { -1 } and another at the systemic velocity .
The blue-shifted cluster may be associated with the extended line emission visible in deep images of Mrk 509 obtained by Phillips et al .
Although several components appear to be saturated , they are not black at their centers .
Partial covering or scattering permits \sim 7 % of the broad-line or continuum flux to be unaffected by absorption .
Of the multiple components , only one has the same ionization state and column density as highly ionized gas that produces the O vii and O viii ionization edges in X-ray spectra of Mrk 509 .