Fig. 15.

CLOUDY H2O(321 − 312)-normalized SLED models in the PDR (left panels) and XDR regime (right panels), for which we varied the intensity of the incident radiation field over the entire parameter space and for two reference values of total hydrogen density (nH = 102.3, 104.6 cm−3), and column density NH = 1024 cm−2. PDR cases are shown in blue and XDRs are red. They are color-coded according to the values of the radiation field flux. The energy of the upper levels of the 220 − 211 and 312 − 303 transitions were shifted for clarity to −20 and +20 K, respectively. In order to exclude unphysical models, we report H2O SLEDs in which the H2O 312 − 221 intensity is > 10−2× that of the corresponding CO(10−9) line.
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