2001ApJ...562..152Z -
Astrophys. J., 562, 152-159 (2001/November-3)
Ultraviolet broad absorption features and the spectral energy distribution of the quasar PG 1351+64.
ZHENG W., KRISS G.A., WANG J.X., BROTHERTON M., OEGERLE W.R., BLAIR W.P., DAVIDSEN A.F., GREEN R.F., HUTCHINGS J.B. and KAISER M.E.
Abstract (from CDS):
We present a moderate-resolution (∼20 km.s–1) spectrum of the mini-broad absorption line quasar (QSO) PG 1351+64 between 915 and 1180 Å, obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE). Additional low-resolution spectra at longer wavelengths were also obtained with the Hubble Space Telescope (HST) and ground-based telescopes. Broad absorption is present on the blue wings of C III λ977, Lyβ, O VI λλ1032, 1038, Lyα, N V λλ1238, 1242, Si IV λλ1393, 1402, and C IV λλ1548, 1550. The absorption profile can be fitted with five components at velocities of ~-780, -1049, -1629, -1833, and -3054 km.s–1 with respect to the emission-line redshift 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 feature is very weak, and the O VI/Lyα flux ratio is 0.08, one of the lowest among low-redshift active galaxies and QSOs. The UV continuum shows a significant change in slope near 1050 Å in the rest frame. The steeper continuum shortward of the Lyman limit extrapolates well to the observed weak X-ray flux level. The absorbers' properties are similar to those of high-redshift broad absorption line QSOs. The derived total column density of the UV absorbers is on the order of 1021 cm–2, unlikely to produce 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 anticipated in the broad-line region; therefore, the absorbers may be related to broad-line clouds along the line of sight.
Abstract Copyright:
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Journal keyword(s):
Galaxies: Active - Galaxies: Quasars: Absorption Lines - quasars: individual (PG 1351+64) - Ultraviolet: Galaxies
Simbad objects:
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