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    Herschel/HIFI discovery of interstellar chloronium (H2Cl+)


    Lis, D.C., Pearson, J.C., Neufeld, D.A., Schilke, P., Muller, 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.O., 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.Anthony, Nagy, Z., Nisini, B., Ossenkopf, V., Pacheco, S., Pagani, L., Parise, B., 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, Neil, van der Tak, F.F.S., van der Wiel, M., van Dishoeck, E.F., Vastel, C., Viti, S., Wakelam, V., Walters, A., Wang, S., Wyrowski, F., Yorke, H.W., Yu, S., Zmuidzinas, J., Delorme, Y., Desbat, J.-P., Gustens, R., Krieg, J.-M. and Delforge, B. (2010) Herschel/HIFI discovery of interstellar chloronium (H2Cl+). Astronomy & Astrophysics, 521 (L9). pp. 1-5. ISSN 0004-6361

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    Abstract

    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.
    Item Type: Article
    Additional Information: © ESO 2011 The original publication is available at DOI: 10.1051/0004-6361/201014959
    Keywords: astrochemistry; line; identification; ISM; abundances; molecules; molecular processes; submillimetre; Herschel/HIFI;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 4020
    Depositing User: Dr. Anthony Murphy
    Date Deposited: 04 Dec 2012 16:18
    Journal or Publication Title: Astronomy & Astrophysics
    Publisher: EDP Sciences
    Refereed: Yes
    Related URLs:
    URI: https://mural.maynoothuniversity.ie/id/eprint/4020
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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