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Herschel/HIFI discovery of interstellar chloronium (H2Cl+)
Stockholm University, Faculty of Science, Department of Astronomy.
2010 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 521, no L9Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2010. Vol. 521, no L9
Keyword [en]
astrochemistry, line: identification, ISM: abundances, ISM: molecules, molecular processes, submillimetre: ISM
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-43224DOI: 10.1051/0004-6361/201014959ISI: 000284150900009OAI: diva2:354781
Totalt 104 författare.Available from: 2010-10-04 Created: 2010-10-04 Last updated: 2011-12-07Bibliographically approved

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