Far Ultraviolet Spectroscopic Explorer observations of intrinsic absorption in the Seyfert 1 galaxy Markarian 509

We present far-ultraviolet spectra of the Seyfert 1 galaxy Mrk 509 obtained in 1999 November with the Fnr Ultraviolet Spectroscopic Explorer. Our data span the observed wavelength range 915-1185 Pi at a resolution of similar to 20 km s(-1). The spectrum shows a blue continuum, broad O VI lambda lamb da 1032, 1038 emission, and a broad C III lambda 977 line. We resolve assoc iated absorption lines of O VI lambda lambda 1032, 1038, C III lambda 977, and Lyman lines through Ly zeta, superposed on these emission components. S even distinct kinematic components are present, spanning a velocity range f rom -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 th e systemic velocity. The blueshifted cluster may be associated with the ext ended line emission visible in deep images of Mrk 509 obtained by Phillips et al. Although several components appear to be saturated, they are not bla ck at their centers. Partial coveting or scattering permits similar to 7% o f the broad-line or continuum flux to be unaffected by absorption. Of the m ultiple components, only one has the same ionization state and column densi ty as highly ionized gas that produces the O VII and O VIII ionization edge s in X-ray spectra of Mrk 509.