Keigo Fukumura

Blueshifted ionized absorption features at near-relativistic velocities (v~0.1c or higher). known as ultra-fast outflows (UFOs), seem to be ubiquitously present in x-ray spectra of many AGN populations of different luminosity. Canonical AGN UFOs, typically detected in Fe K band, exhibit massive column (NH > 1e23 cm^-2), highly ionized ions (log \xi ~ 4 – 6) besides its high velocity. Despite an extensive effort (both theoretical and observational) to reveal the physical identity and its origin, our understanding of these outflows remains very elusive to date. I will discuss a scenario where ionized UFOs are magnetically launched from an accretion disk by the action of a global black hole magnetosphere. Utilizing semi-analytic magnetohydrodynamic (MHD) framework of disk-winds, we perform post-process photoionization calculations with xstar to model Fe XXVI UFO spectrum and its potential behavior such as correlations for different X-ray luminosity.