Herschel/HIFI discovery of interstellar chloronium (H2Cl+)

@article{Lis2010HerschelHIFIDO,
  title={Herschel/HIFI discovery of interstellar chloronium (H2Cl+)},
  author={Dariusz C. Lis and John C. Pearson and David A. Neufeld and Peter Schilke and Holger S. P. Muller and Harshal Gupta and Tom A. Bell and Claudia Comito and Thomas G. Phillips and Edwin Anthony Bergin and Cecilia Ceccarelli and Paul. F. Goldsmith and Geoffrey A. Blake and Aurore Bacmann and Alain Baudry and Milena Benedettini and A. O. Benz and John H. Black and A. C. Adwin Boogert and Sandrine Bottinelli and Sylvie Cabrit and Paola Caselli and Alain Castets and Emmanuel Caux and Jos{\'e} Cernicharo and Claudio Codella and Audrey Coutens and Nicolas Crimier and Nathan R. Crockett and Fabien Daniel and Karine Demyk and C. Dominic and M. L. Dubernet and Martin Emprechtinger and Pierre J. Encrenaz and Edith Falgarone and Asunci{\'o}n Fuente and Maryvonne Gerin and Thomas F. Giesen and Javier R. Goicoechea and Frank P. Helmich and Patrick Hennebelle and Th. Henning and Eric Herbst and Pierre Hily-Blant and Aa. Hjalmarson and David J. Hollenbach and T. Jack and Christine Joblin and Doug Johnstone and Claudine Kahane and Mihkel Kama and Michael J. Kaufman and Alain Klotz and William D. Langer and Bengt Larsson and Jacques Le Bourlot and Bertrand Lefloch and Franck Le Petit and D. Z. Li and Ren{\'e} Liseau and Steven D. Lord and A. Lorenzani and S{\'e}bastien Maret and P. G. Martin and Gary J. Melnick and Karl M. Menten and Patrick W. Morris and J. Anthony Murphy and Zs{\'o}fia Nagy and Brunella Nisini and V. Ossenkopf and S. Pacheco and Laurent Pagani and B{\'e}reng{\`e}re Parise and M. P'erault and Rene Plume and Sheng-Li Qin and {\`E}velyne Roueff and Morvan C. Salez and Aa. Sandqvist and Paolo Saraceno and Stephan Schlemmer and Karl F. Schuster and Ronald L. Snell and J{\"u}rgen Stutzki and A. Tielens and Neil A. Trappe and Floris van der Tak and Matthijs van der Wiel and Ewine F. van Dishoeck and Charlotte Vastel and Serena Viti and Valentine Wakelam and Adam D. Walters and S P Wang and Friedrich Wyrowski and Harold W. Yorke and S. Yu and Jonas Zmuidzinas and Yan Delorme and J. Desbat and Rolf Gusten and John M. Krieg and Bertrand Delforge},
  journal={Astronomy and Astrophysics},
  year={2010},
  volume={521},
  pages={9}
}
We report the first detection of chloronium, H2Cl+, in the interstellar medium, using the HIFI instrument aboard the Herschel Space Observatory. The 212-101 lines of ortho-H_235Cl+ and ortho-H_237Cl+ are detected in absorption towards NGC 6334I, and the 111-000 transition of para-H_235Cl+ is detected in absorption towards NGC 6334I and Sgr B2(S). The H2Cl+ column densities are compared to those of the chemically-related species HCl. The derived HCl/H2Cl+ column density ratios, ~1-10, are within… 

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  • M. GerinF. Lévrier K. Menten
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  • 2012
An analysis of two sight-lines investigated by the PRISMAS project, towards the star-forming regions W49N and W51, and an analysis of the physical properties of the diffuse interstellar gas, including the electron abundance, the fraction of gas in molecular form, and constraints on the cosmic ray ionization rate and the gas density are presented.
...

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