The High Energy Resolution View of Ionized Absorbers in Agn

A number of emission and absorption features are expected to be visible in high energy resolution X-ray spectra of type 1 AGN with ionized gas along the line of sight (so called " warm absorbers "). Emission strongly depends on the geometrical configuration of the gas, while absorption along the line of sight does not. Absorption features include photoelectric absorption K and L edges along with many strong Kα, Kβ and L resonance absorption lines from the most abundant elements. We present detailed simulations of our " photoelectric + resonant absorption " model with the high energy resolution gratings and calorimeters of AXAF, XMM and Constellation-X, and discuss the relevant physics which can be addressed with the new generation of X-ray spectrometers.