[C ii] luminosities of the individual ISM components are plotted as a function of radius in a galactic nucleus with a central X-ray source with L(X-ray) = 1042 (top panel) and 1044 erg s-1 (bottom panel) with a filling factor η(PDR) = 2 × 10-3. The assumed ISM parameters and dimensions of the nucleus are given in the text. The dense WIM dominates the [C ii] emission at L(X-ray) =1040 erg s-1 but is increasingly suppressed with increasing L(X-ray) until the PDRs dominate the emission.
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