A simple Mathematica PDR model code Written by M. Röllig (2018). Contact: roellig@ph1.uni-koeln.de,https://markusroellig.github.io/ .
Fig.: Star forming region S106, Copyright: NASA & ESA
PDRs are Photon Dominated Regions in the interstellar medium. A PDR model computes the chemical and thermodynamical balance in these regions and their emission signature (see e.g. https://www.astro.uni-koeln.de/node/346).
Fig.: Simplified structure of a PDR. UV radiation (coming from the left) is progressively attenuated while penetrating a gas cloud. This leads to a chemical stratification and a strong temperature gradient.
WL-PDR is a port of the simple toy PDR model PyPDR written by Simon Bruderer (2019). This is not meant to be a model for real world applications but to test certain numerical or physical aspects of PDR modelling in a very simple model setup.
The model is published in Röllig & Ossenkopf-Okada 2022 (https://ui.adsabs.harvard.edu/abs/2022arXiv220504233R/abstract ).