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   PR # 12083
    According to a body of circumstantial evidence, some AGNs control the
    ionization state of the material through which their spectra are seen
    in absorption.  Known as the ``warm-absorber,''this proposed model,
    if true, can affect our understanding of variability,the near-nuclear
    environment of AGNs, and the measurement of their true intrinsic spec
    tra. The spectral resolution of Astro-D offers at long last the capab
    ility of actually seeing the absorption edges of partially ionized
    atoms, the defining feature of the model which has only been crudely
    inferred from previous,low-resolution observations.The Seyfert galaxy
    NGC 3516 has been specifically chosen as the object most likely to
    reveal the warm absorber, as the model finally faces its ``moment of
   truth.''
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