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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559324.0, MPI für Astronomie / Publikationen_mpia
Herschel/HIFI discovery of interstellar chloronium (H2Cl+)
Authors:Lis, D. C.; Pearson, J. C.; Neufeld, D. A.; Schilke, P.; Müller, 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, Å.; 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, B.; Pérrault, 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.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:A&A
Start Page:id.L9
Review Status:Peer-review
Audience:Experts Only
Abstract / 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-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 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. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.Table 1 and acknowledgments (page 5) are only available in electronic form at <A href="http://www.aanda.org">http://www.aanda.org</A>
Free Keywords:astrochemistry; line: identification; ISM: abundances; ISM: molecules; molecular processes; submillimetre: ISM
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2010A%26A...521L...... [ID No:1]
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