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24 April 2024

» arxiv » 1005.5653

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Interstellar OH+, H2O+ and H3O+ along the sight-line to G10.6-0.4
Maryvonne Gerin ; M. De Luca ; John Black ; Eric Herbst ; Javier R.Goicoechea ; Edith Falgarone ; Benjamin Godard ; John C. Pearson ; Dariucz C. Lis ; Thomas G. Phillips ; Thomas A. Bell ; Paule Sonnentrucker ; Francois Boulanger ; José Cernicharo ; Audrey Coutens ; Emmanuel Dartois ; Pierre Encrenaz ; Thomas Giesen ; Paul F. Goldsmith ; Harshal Gupta ; Cecile Gry ; Patrick Hennebelle ; Pierre Hily-Blant ; Christine Joblin ; Maja Kazmierczak ; Robert Kolos ; Jacek Krelowski ; Jesus Martin-Pintado ; Raquel Monje ; Bhaswati Mookerjea ; Michel Pérault ; Carina Persson ; René Plume ; Paul B. Rimmer ; Morvan Salez ; Mirisloaw Schmidt ; David Teyssier ; Charlotte Vastel ; Shan Shan Yu ; Alessandra Contursi ; Karl Menten ; Thomas Geballe ; Stephan Schlemmer ; Russ Shipman ; Alexander G.G.M. Tielens ; Sabine Philipp-May ; Alain Cros ; Jonas Zmuidzinas ; L. A Samoska ; K. Klein ; D.A. Neufeld ; A. Lorenzani ; Jürgen Stutzki ;
Date:	31 May 2010
Abstract:	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+) $> 2.5 imes 10^{14}$ cm$^{-2}$, $N$(H2O+) $sim 6 imes 10^{13}$ cm$^{-2}$ and $N$(H3O+) $sim 4.0 imes 10^{13}$ 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.
Source:	arXiv, 1005.5653
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