Benchmarking PDR models against the Horsehead edge
  To prepare for the unprecedented spatial and spectral resolution provided by ALMA and Herschel/HIFI, chemical models are being benchmarked against each other. It is obvious that chemical models also need well-constrained observations that can serve as references. Photo-dissociation regions (PDRs) are particularly well suited to serve as references because they make the link between diffuse and molecular clouds, thus enabling astronomers to probe a large variety of physical and chemical processes. At a distance of 400 pc (1" corresponding to 0.002 pc), the Horsehead PDR is very close to the prototypical kind of source (i.e. 1D, edge-on) needed to serve as a reference to models. 
J\'er\^ome Pety (LAM/IRAM, LERMA), Javier R. Goicoechea (LERMA),   Maryvonne Gerin (LERMA), Pierre Hily-Blant (LAM/IRAM), Da...