SIMBAD references

We present Chandra observations of the radio-quiet broad absorption line (BAL) quasar PG 1254+047. We find that it is a weak X-ray source, with a total of 44±7 photons measured in 36 ks across the observed energy range 0.7-6.0 keV. Its X-ray weakness is consistent with the known correlation between α_ox 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 N_H>10²³ cm^–2 for neutral gas, while the intrinsic (unabsorbed) emission spectrum has α_ox>2. The data are best fit by including an ionized (rather than neutral) absorber with column density N_H≳2x10²³ cm^–2. 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 10¹⁶ cm with a mass-loss rate of ∼1Q M_☉ yr^–1.