Ultraviolet broad absorption features and the spectral energy distributionof the quasar PG 1351+641

We present a moderate-resolution (similar to 20 km s(-1)) spectrum of the m ini-broad absorption line quasar (QSO) PG 1351+64 between 915 and 1180 Angs trom obtained with the Far Ultraviolet Spectroscopic Explorer AZ, (FUSE). A dditional low-resolution spectra at longer wavelengths were also obtained w ith the Hubble Space Telescope (HST) and ground-based telescopes. Broad abs orption is present on the blue wings of C III lambda 977, Ly beta, O VI lam bda lambda 1032, 1038, Ly alpha, N V lambda lambda 1238, 1242, Si IV lambda lambda 1393, 1402, and C IV lambda lambda 1548, 1550. The absorption profi le can be fitted with five components at velocities of similar to -780, -10 49, -1629, -1833, and -3054 km s(-1) with respect to the emission-line reds hift of z = 0.088. All the absorption components cover a large fraction of the continuum source, as well as the broad-line region. The O VI emission f eature is very weak, and the O VI/Ly alpha flux ratio is 0.08, one of the l owest among low-redshift active galaxies and QSOs. The UV continuum shows a significant change in slope near 1050 Angstrom in the AZ rest frame. The s teeper continuum shortward of the Lyman limit extrapolates well to the obse rved weak X-ray flux level. The absorbers' properties are similar to those of high-redshift broad absorption line QSOs. The derived total column densi ty of the UV absorbers is on the order of 10(21) cm(-2), unlikely to produc e significant opacity above 1 keV in the X-ray. Unless there is a separate, high-ionization X-ray absorber, the QSO's weak X-ray flux may be intrinsic . The ionization level of the absorbing components is comparable to that an ticipated in the broad-line region; therefore, the absorbers may be related to broad-line clouds along the line of sight.