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Abstract We announce the C23.01 update of cloudy . This corrects a simple coding error, present since ∼1990, in one routine that required a conversion from the line-center to the mean normalization of the Ly α optical depth. This affects the destruction of H i Ly α by background opacities. Its largest effect is upon the Ly α intensity in high-ionization dusty clouds, where the predicted intensity is now up to three times stronger. Other properties that depend on Ly α destruction, such as grain infrared emission, change in response.
Gunasekera et al. (Thu,) studied this question.