At H2 columns above about 10^25 cm^-2, trapped infrared radiation heats inner dust and makes HCN vibrational lines bright and optically thick, explaining observations of buried galactic nuclei.
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The Greenhouse Effect in Buried Galactic Nuclei and the Resonant HCN Vibrational Emission
At H2 columns above about 10^25 cm^-2, trapped infrared radiation heats inner dust and makes HCN vibrational lines bright and optically thick, explaining observations of buried galactic nuclei.