Tell-Tale Spectral Signatures of MHD-Driven X-ray UFOs in Athena Era

We aim to explore spectral signatures of the predicted multi-ion AGN UFOs in the
broadband X-ray spectra by exploiting an accretion disk wind model in the context of a
simple magnetohydrodynamic (MHD) framework. We are focused primarily on
examining the spectral dependences on a number of key physical properties of active
galactic nuclei (AGNs); i.e. (1) inclination, (2) X-ray photon index, (3) optical/UV-to-
X-ray strength, (4) wind density gradient along a line of sight, (5) wind density
normalization and (6) Eddington ratio. Considering primarily radio-quiet Seyferts and
quasars, multi-ion UFO spectra are systematically calculated as a function of these
parameters to show that MHD-driven UFOs are likely to imprint a unique asymmetric
absorption line profile with a pronounced blue tail structure on average. Such a "tell-
tale" line signature, being almost generic to MHD disk winds due to the intrinsic wind
kinematics, might be utilized as a diagnostic proxy to potentially differentiate leading
driving processes among thermally-driven, UV line-driven and MHD-driven scenarios.
We also demonstrate a high fidelity of microcalorimeter observations in anticipation of
the upcoming XRISM/Resolve and Athena/X-IFU data by performing spectral
simulations.