An Intrinsically X - Ray Weak , Heavily Absorbed Balqso ?

We present Chandra observations of the radio-quiet Broad Absorption Line (BAL) QSO PG 1254+047. We find that it is a weak X-ray source, with a total of 44 ± 7 photons measured in 36 ksec across the observed energy range 0.7 − 6.0 keV. Its X-ray weakness is consistent with the known correlation between αox and the strength of the UV absorption lines. The spectral energy distribution suggests that PG 1254+047 is intrinsically X-ray weak, in addition to being heavily X-ray absorbed. The X-ray absorption column density is NH > 10 23 cm for neutral gas, while the intrinsic (unabsorbed) emission spectrum has αox > 2. The data are fit best by including an ionized (rather than neutral) absorber, with column density NH ∼> 2× 10 23 cm. The degree of ionization is consistent with the UV BALs, as is the total column density if the strongest UV lines are saturated. If the X-ray absorber forms in a wind that is radiatively accelerated to the BAL velocities, then the wind must be launched from a radius of about 10 cm with a mass loss rate of ∼ 1 M⊙ yr . Subject headings: galaxies: active—quasars: absorption lines—quasars: individual (PG 1254+047)—X-rays: galaxies