2011ApJ...737...46M

We present Suzaku observations of three iron low-ionization broad absorption line quasars (FeLoBALs). We detect J1723+5553 (3σ) in the observed 2-10 keV band, and constrain its intrinsic N_H column density to N_H > 6x10²³/cm2 by modeling its X-ray hardness ratio. We study the broadband spectral index, α_ox, between the X-ray and UV bands by combining the X-ray measurements and the UV flux extrapolated from Two Micron All Sky Survey magnitudes, assuming a range of intrinsic column densities, and then comparing the α_ox values for the three FeLoBALs with those from a large sample of normal quasars. We find that the FeLoBALs are consistent with the spectral energy distribution of normal quasars if the intrinsic N_H column densities are N_H> 7x10²³/cm2 for J0943+5417, N_H>2 x10²⁴/cm2 for J1352+4293, and 6x10²³/cm2 < N_H< 3x10²⁴/cm2 for J1723+5553. At these large intrinsic column densities, the optical depth from Thomson scattering can reach ∼6, which will significantly modulate the UV flux. Our results suggest that the X-ray absorbing material could be located at a different place from the UV absorbing wind, likely between the X-ray and UV emitting regions. We find a significant kinetic feedback efficiency for FeLoBALs, indicating that the outflows are an important feedback mechanism in quasars.