Herschel/HIFI discovery of interstellar chloronium (H2Cl+) [Letter]
- Lis, D. C.
- Pearson, J. C.
- Neufeld, D. A.
- Schilke, P.
- Mueller, H. S. P.
- Gupta, H.
- Bell, T. A.
- Comito, C.
- Phillips, T. G.
- Bergin, E. A.
- Ceccarelli, C.
- Goldsmith, P. F.
- Blake, G. A.
- Bacmann, A.
- Baudry, A.
- Benedettini, M.
- Benz, A.
- Black, J.
- Boogert, A.
- Bottinelli, S.
- Cabrit, S.
- Caselli, P.
- Castets, A.
- Caux, E.
- Cernicharo, J.
- Codella, C.
- Coutens, A.
- Crimier, N.
- Crockett, N. R.
- Daniel, F.
- Demyk, K.
- Dominic, C.
- Dubernet, M. -L.
- Emprechtinger, M.
- Encrenaz, P.
- Falgarone, E.
- Fuente, A.
- Gerin, M.
- Giesen, T. F.
- Goicoechea, J. R.
- Helmich, F.
- Hennebelle, P.
- Henning, Th.
- Herbst, E.
- Hily-Blant, P.
- Hjalmarson, A.
- Hollenbach, D.
- Jack, T.
- Joblin, C.
- Johnstone, D.
- Kahane, C.
- Kama, M.
- Kaufman, M.
- Klotz, A.
- Langer, W. D.
- Larsson, B.
- Le Bourlot, J.
- Lefloch, B.
- Le Petit, F.
- Li, D.
- Liseau, R.
- Lord, S. D.
- Lorenzani, A.
- Maret, S.
- Martin, P. G.
- Melnick, G. J.
- Menten, K. M.
- Morris, P.
- Murphy, J. A.
- Nagy, Z.
- Nisini, B.
- Ossenkopf, V.
- Pacheco, S.
- Pagani, L.
- Parise, Berengere
- Perault, M.
- Plume, R.
- Qin, S. -L.
- Roueff, E.
- Salez, M.
- Sandqvist, A.
- Saraceno, P.
- Schlemmer, S.
- Schuster, K.
- Snell, R.
- Stutzki, J.
- Tielens, A.
- Trappe, N.
- van der Tak, F. F. S.
- van der Wiel, M. H. D.
- van Dishoeck, E.
- Vastel, C.
- Viti, S.
- Wakelam, V.
- Walters, A.
- Wang, S.
- Wyrowski, F.
- Yorke, H. W.
- Yu, S.
- Zmuidzinas, J.
- Delorme, Y.
- Desbat, J. -P.
- Guesten, R.
- Krieg, J. -M.
- Delforge, B.
DOIAbstract
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-HCl+ and ortho-HCl+ are detected in absorption towards NGC 6334I, and the 111–000 transition of para-HCl+ 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 the range predicted by models of diffuse and dense photon dominated regions (PDRs). However, the observed H2Cl+ column densities, in excess of 1013 cm-2, are significantly higher than the model predictions. Our observations demonstrate the outstanding spectrosco...
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