Spatially extended OH + emission from the Orion Bar and Ridge. ⋆

@article{Tak2013SpatiallyEO,
  title={Spatially extended OH + emission from the Orion Bar and Ridge. ⋆},
  author={Floris van der Tak and Zs{\'o}fia Nagy and V. Ossenkopf and Zolt{\'a}n S{\'a}ndor Makai and John H. Black and Alexandre Faure and Maryvonne Gerin and Ted Bergin},
  journal={Astronomy and Astrophysics},
  year={2013},
  volume={560},
  pages={951}
}
Context. The reactive HnO+ ions (OH+, H2O+ and H3O+) are widespread in the interstellar medium and act as precursors to the H2O molecule. While HnO+ absorption is seen on many Galactic lines of sight, active galactic nuclei often show the lines in emission. Aims: This paper shows the first example of a Galactic source of HnO+ line emission: the Orion Bar, a bright nearby photon-dominated region (PDR). Methods: We present line profiles and maps of OH+ line emission toward the Orion Bar, and… 

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