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university of Provence - Aix-Marseille I |  |
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university of Provence - Aix-Marseille I | |
| HAL: hal-00485859, version 1 |
| arXiv: 1005.5653 |
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| Interstellar OH+ , H2O+ and H3O+ along the sight-line to G10.6-0.4 |
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| Maryvonne Gerin 1M. De Luca 1 |
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| For the PRISMAS collaboration(s) |
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| (2010-05-21) |
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| We report the detection of absorption lines by the reactive ions OH+, H2O+ and H3O+ along the line of sight to the submillimeter continuum source G10.6$-$0.4 (W31C). We used the Herschel HIFI instrument in dual beam switch mode to observe the ground state rotational transitions of OH+ at 971~GHz, H2O+ at 1115 and 607~GHz, and H3O+ at 984 GHz. The resultant spectra show deep absorption over a broad velocity range that originates in the interstellar matter along the line of sight to G10.6$-$0.4 as well as in the molecular gas directly associated with that source. The OH+ spectrum reaches saturation over most velocities corresponding to the foreground gas, while the opacity of the H2O+ lines remains lower than 1 in the same velocity range, and the H3O+ line shows only weak absorption. For LSR velocities between 7 and 50 kms$^{-1}$ we estimate total column densities of $N$(OH+) $> 2.5 \times 10^{14}$ cm$^{-2}$, $N$(H2O+) $\sim 6 \times 10^{13}$ cm$^{-2}$ and $N$(H3O+) $\sim 4.0 \times 10^{13}$ cm$^{-2}$. These detections confirm the role of O$^+$ and OH$^+$ in initiating the oxygen chemistry in diffuse molecular gas and strengthen our understanding of the gas phase production of water. The high ratio of the OH+ by the H2O+ column density implies that these species predominantly trace low-density gas with a small fraction of hydrogen in molecular form. |
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| 1: | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA) |
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CNRS : UMR8112 – INSU – Observatoire de Paris – Université Pierre et Marie Curie [UPMC] - Paris VI – Université de Cergy Pontoise – Ecole normale supérieure de Paris - ENS Paris |
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| 2: | Onsala space observatory (oso) |
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Chalmers University of Technology |
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| 3: | Department of Physics (OHIO STATE UNIVERSITY) |
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Ohio State University |
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| 4: | Departments of Astronomy and Chemistry |
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The Ohio State University |
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| 5: | centro de astrobiologia (CAB-INTA) |
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Instituto Nacional de Técnica Aeroespacial |
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| 6: | Centro de Investigaciones Biológicas (CSIC) |
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Consejo Superior de Investigaciones Cientificas |
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| 7: | Jet Propulsion Laboratory [NASA] (JPL) |
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NASA – California Institute of Technology |
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| 8: | CalTech-CSO (CSO) |
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California Institute of Technology |
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| 9: | Department of physics and astronomy |
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The John Hopkins University |
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| 10: | Institut d'astrophysique spatiale (IAS) |
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CNRS : UMR8617 – INSU – Université Paris XI - Paris Sud |
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| 11: | Centre d'étude spatiale des rayonnements (CESR) |
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CNRS : UMR5187 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
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| 12: | I physikalisches institut |
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University of Cologne |
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| 13: | Laboratoire d'Astrophysique de Marseille (LAM) |
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CNRS : UMR6110 – INSU – Université de Provence - Aix-Marseille I |
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| 14: | Laboratoire d'Astrophysique de Grenoble (LAOG) |
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CNRS : UMR5571 – OSUG – INSU – Université Joseph Fourier - Grenoble I |
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| 15: | Center for astronomy |
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Nicolaus Copernicus University |
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| 16: | Institute of physical chemistry |
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Polish Academy of Sciences |
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| 17: | Instituto de Estructura de la Materia (IEM) |
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Consejo Superior de Investigaciones Cientificas |
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| 18: | Tata Institute for fundamental research |
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tata institute for fundamental research |
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| 19: | Department of physics and astronomy |
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Univetsity of calgary – University of Calgary |
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| 20: | Nicolaus Copernicus Astronomical Center |
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Polish Academy of Sciences |
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| 21: | MPI fur Extraterrestrische Physik (MPE) |
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Max-Planck-Institut |
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| 22: | MPI f"ur Radioastronomie (MpIfR) |
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Max-Planck-Institut |
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| 23: | Gemini Telescope |
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Gemini Telescope |
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| 24: | Institute for Space Research Netherlands (SRON) |
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SRON Netherlands Institute for Space Research |
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| 25: | Sterrewacht Leiden |
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Leiden University |
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| 26: | Deutsches Zentrum fur Luft- und Raumfahrt |
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Deutsches Zentrum fur Luft and Raumfahrt |
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| 27: | Laboratoire Lasers, Plasmas et Procédés photoniques (LP3) |
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CNRS : UMR6182 – Université de la Méditerranée - Aix-Marseille II |
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| 28: | Osservatorio Astrofisico di Arcetri |
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INAF |
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| Subject | : | Sciences of the Universe/Astrophysics/Galactic Astrophysics Physics/Astrophysics/Galactic Astrophysics |
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| Attached file list to this document: | ||||||||||
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| hal-00485859, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00485859 | |
| oai:hal.archives-ouvertes.fr:hal-00485859 | |
| From: Maryvonne Gerin | |
| Submitted on: Wednesday, 26 May 2010 11:35:49 | |
| Updated on: Monday, 31 May 2010 12:26:37 | |
