Herschel/HIFI discovery of interstellar chloronium (H2Cl+)
Lis, D.C. and Pearson, J.C. and Neufeld, D.A. and Schilke, P. and Muller, H.S.P. and Gupta, H. and Bell, T.A. and Comito, C. and Phillips , T.G. and Bergin, E.A. and Ceccarelli, C. and Goldsmith, P.F. and Blake, G.A. and Bacmann, A. and Baudry, A. and Benedettini, M. and Benz, A. and Black, J. and Boogert, A. and Bottinelli, S. and Cabrit, S. and Caselli, P. and Castets, A. and Caux, E. and Cernicharo, J. and Codella, C. and Coutens, A. and Crimier, N. and Crockett, N.R. and Daniel, F. and Demyk, K. and Dominic, C. and Dubernet, M.-L. and Emprechtinger, M. and Encrenaz, P. and Falgarone, E. and Fuente, A. and Gerin, M. and Giesen, T.F. and Goicoechea, J.R. and Helmich, F. and Hennebelle, P. and Henning, Th. and Herbst, E. and Hily-Blant, P. and Hjalmarson, A. and Hollenbach, D. and Jack, T. and Joblin, C. and Johnstone, D. and Kahane, C. and Kama, M. and Kaufman, M. and Klotz, A. and Langer, W.D. and Larsson, B. and Le Bourlot, J. and Lefloch, B. and Le Petit, F. and Li, D. and Liseau, R. and Lord, S.D. and Lorenzani, A. and Maret, S. and Martin, P.G. and Melnick, G.J. and Menten, K.M. and Morris, P. and Murphy, J.A. and Nagy, Z. and Nisini, B. and Ossenkopf, V. and Pacheco, S. and Pagani, L. and Parise, B. and Perault, M. and Plume, R. and Qin, S.-L. and Roueff, E. and Salez, M. and Sandqvist, A. and Saraceno, P. and Schlemmer, S. and Schuster, K. and Snell, R. and Stutzki, J. and Tielens, A. and Trappe, N. and van der Tak, F.F.S. and van der Wiel, M. and van Dishoeck, E.F. and Vastel, C. and Viti, S. and Wakelam, V. and Walters, A. and Wang, S. and Wyrowski, F. and Yorke, H.W. and Yu, S. and Zmuidzinas, J. and Delorme, Y. and Desbat, J.-P. and Gustens, R. and Krieg, J.-M. and Delforge, B. (2010) Herschel/HIFI discovery of interstellar chloronium (H2Cl+). Astronomy & Astrophysics, 521 (L9). pp. 1-5. ISSN 0004-6361
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-H35 2 Cl+ and ortho-H37 2 Cl+ are detected in absorption towards NGC 6334I, and the 111−000 transition of para-H35 2 Cl+ 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 spectroscopic capabilities of HIFI for detecting new interstellar molecules and providing key constraints for astrochemical models.
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