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The physics behind the ionization structure of outflows from black holes isyet to be fully understood. Using archival observations with the Chandra\HETGgratings over the past two decades, we measured an absorption measuredistribution for a sample of outflows in nine active galaxies (AGNs), namelythe dependence of outflow column density, $N_H$, on the ionization parameter,$\xi$. The slope of $\log(N_H)$ vs. $\log\xi$ is found to be between 0.00 and0.72. We find an anti-correlation between the log of total column density ofthe outflow and the log of AGN luminosity, and none with the black hole massand accretion efficiency. A major improvement in the diagnostics of AGNoutflows will potentially occur with the launch of the XRISM/Resolvespectrometer. We study the ability of Resolve to reveal the outflow ionizationstructure by constructing the absorption measure distribution from simulatedResolve spectra, utilizing its superior resolution and effective area. Resolveconstrains the column density as well as HETG, but with much shorterobservations.

Ionization Distributions in Outflows of Active Galaxies: Universal Trends and Prospect of Future XRISM Observations