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We present theoretical CIV 1548,1550 absorption line profiles for QSOscalculated assuming the accretion disk wind (ADW) scenario. The results suggestthat the multiple absorption troughs seen in many QSOs may be due to thediscontinuities in the ion balance of the wind (caused by X-rays), rather thandiscontinuities in the density/velocity structure. The profiles are calculatedfrom a 2.5D time-dependent hydrodynamic simulation of a line-driven disk windfor a typical QSO black hole mass, a typical QSO luminosity, and for a standardShakura-Sunyaev disk. We include the effects of ionizing X-rays originatingfrom within the inner disk radius by assuming that the wind is shielded fromthe X-rays from a certain viewing angle up to 90o ("edge on"). In the shieldedregion we assume constant ionization equilibrium, and thus constant line-forceparameters. In the non-shielded region we assume that both the line-force andthe C+3 populations are nonexistent. The model, at viewing angles close to theangle that separates the shielded region and the non-shielded region, producesabsorption lines with multiple troughs. The steady nature of accretion diskwinds, in turn, may account for the steady nature of the absorption structureobserved in multiple-trough broad absorption line QSOs. The model parametersare Mbh = 10^9 Msun and Ldisk = 10^47 erg s-1.

On The Formation Of Multiple Absorption Troughs In Broad Absorption Line QSOs