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We present results from simultaneous observations of the high-mass X-raybinary system Cygnus X-1 / HDE 226868 with Suzaku, Chandra-HETGS, XMM-Newton,RXTE, INTEGRAL, and Swift in 2008 April. Performed shortly after orbital phase0, when our line of sight to the black hole passes through the densest part ofthe O-star's wind, these obervations show common transient absorption dips inthe soft X-ray band. For the first time, however, we detect a simultaneousscattering trough in the hard X-ray light curves. The more neutral clump isthus only the core of a larger ionized blob, which contains a significantfraction of the total wind mass. The diluted wind outside of these clumps isalmost completely photoionized.

A Thorough Look at the Photoionized Wind and Absorption Dips in the Cygnus X-1 / HDE 226868 X-ray Binary System