Authors
DC Lis, JC Pearson, DA Neufeld, P Schilke, HSP Müller, H Gupta, TA Bell, C Comito, TG Phillips, EA Bergin, C Ceccarelli, PF Goldsmith, GA Blake, A Bacmann, Alain Baudry, M Benedettini, A Benz, J Black, A Boogert, S Bottinelli, S Cabrit, P Caselli, Alain Castets, E Caux, J Cernicharo, C Codella, A Coutens, N Crimier, NR Crockett, F Daniel, K Demyk, C Dominic, M-L Dubernet, M Emprechtinger, P Encrenaz, E Falgarone, A Fuente, M Gerin, TF Giesen, JR Goicoechea, F Helmich, P Hennebelle, Th Henning, E Herbst, Pierre Hily-Blant, Å Hjalmarson, D Hollenbach, T Jack, C Joblin, D Johnstone, C Kahane, M Kama, M Kaufman, A Klotz, WD Langer, B Larsson, J Le Bourlot, B Lefloch, F Le Petit, D Li, R Liseau, SD Lord, A Lorenzani, S Maret, PG Martin, GJ Melnick, KM Menten, P Morris, JA Murphy, Z Nagy, B Nisini, V Ossenkopf, S Pacheco, L Pagani, B Parise, M Pérault, R Plume, S-L Qin, E Roueff, M Salez, A Sandqvist, P Saraceno, S Schlemmer, K Schuster, R Snell, J Stutzki, AGGM Tielens, N Trappe, FFS van Der Tak, MHD van Der Wiel, E Van Dishoeck, C Vastel, S Viti, Valentine Wakelam, A Walters, S Wang, F Wyrowski, HW Yorke, S Yu, J Zmuidzinas, Y Delorme, J-P Desbat, R Güsten, J-M Krieg, B Delforge
Publication date
2010/10/1
Journal
Astronomy & Astrophysics
Volume
521
Pages
L9
Publisher
EDP Sciences
Description
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 spectroscopic capabilities of HIFI for detecting new interstellar molecules and providing key constraints for astrochemical models.
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DC Lis, JC Pearson, DA Neufeld, P Schilke… - Astronomy & Astrophysics, 2010