Interstellar OH+, H2O+ and H3O+ along the sight-line to G10.6-0.4
Maryvonne Gerin
(1, 2, 3)
,
Massimo de Luca
(1, 2, 3)
,
John H. Black
(4)
,
Javier R. Goicoechea
(5)
,
Eric Herbst
(6)
,
David A. Neufeld
(7)
,
Edith Falgarone
(1, 2, 3)
,
Benjamin Godard
(1, 2, 3, 8)
,
John C. Pearson
(9)
,
Darek C. Lis
(10)
,
Thomas G. Phillips
(10)
,
Tom A. Bell
(10)
,
Paule Sonnentrucker
(7)
,
Francois Boulanger
(8)
,
José Cernicharo
(5)
,
A. Coutens
(11, 12)
,
Emmanuel Dartois
(8)
,
Pierre J. Encrenaz
(1, 2, 3)
,
T. Giesen
(13)
,
Paul F. Goldsmith
(9)
,
Harshal Gupta
(9)
,
Cecile Gry
(14)
,
Patrick Hennebelle
(1, 2, 3)
,
Pierre Hily-Blant
(15)
,
Christine Joblin
(11, 12)
,
M. Kazmierczak
(16)
,
R. Kolos
(17)
,
J. Krelowski
(16)
,
Jesus Martin-Pintado
(5)
,
Raquel Monje
(10)
,
Bhaswati Mookerjea
(18)
,
Michel Pérault
(1, 2, 3)
,
C. M. Persson
(4)
,
René Plume
(19)
,
P. B. Rimmer
(6)
,
Morvan Salez
(1, 2, 3)
,
M. Schmidt
(20)
,
J. Stutzki
(13)
,
David Teyssier
(21)
,
Charlotte Vastel
(11, 12)
,
Shanshan Yu
(9)
,
A. Contursi
(22)
,
Karl M. Menten
(23)
,
Thomas R. Geballe
(24)
,
S. Schlemmer
(13)
,
Russell Shipman
(25)
,
A. Tielens
(26)
,
S. Philipp-May
(23)
,
A. Cros
(11, 12)
,
J. Zmuidzinas
(10)
,
L. A. Samoska
(9)
,
Karl-Ludwig Klein
(27)
,
A. Lorenzani
(28)
1
LERMA -
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
2 Instrumentation et télédétection
3 Dynamique des milieux interstellaires et plasmas stellaires
4 Chalmers University of Technology
5 CAB - Centro de Astrobiología, Consejo Superior de Investigaciones Científicas (CSIC)/Instituto Nacional de Técnica Aeroespacial (INTA)
6 OSU - The Ohio State University [Columbus]
7 JHU - Johns Hopkins University
8 IAS - Institut d'astrophysique spatiale
9 JPL - Jet Propulsion Laboratory
10 Cahill Center for Astronomy and Astrophysics
11 UT - Université de Toulouse
12 CESR - Centre d'étude spatiale des rayonnements
13 Physikalisches Institut, Universität zu Köln
14 LAM - Laboratoire d'Astrophysique de Marseille
15 LAOG - Laboratoire d'Astrophysique de Grenoble
16 Nicolaus Copernicus University [Toruń]
17 Institute of Physical Chemistry, Polish Academy of Sciences
18 TIFR - Tata Institute of Fundamental Research
19 University of Calgary
20 ESAC - European Space Astronomy Centre
21 MPE - Max-Planck-Institut für Extraterrestriche Physik
22 MPIfR - Max-Planck-Institut für Radioastronomie
23 Gemini telescope, Hilo
24 CAMK - Centrum Astronomiczne im. M. Kopernika, Warszawa
25 SRON - SRON Netherlands Institute for Space Research
26 Sterrewacht Leiden, Leiden University
27 DLR - Deutsches Zentrum für Luft- und Raumfahrt
28 OAA - INAF - Osservatorio Astrofisico di Arcetri
2 Instrumentation et télédétection
3 Dynamique des milieux interstellaires et plasmas stellaires
4 Chalmers University of Technology
5 CAB - Centro de Astrobiología, Consejo Superior de Investigaciones Científicas (CSIC)/Instituto Nacional de Técnica Aeroespacial (INTA)
6 OSU - The Ohio State University [Columbus]
7 JHU - Johns Hopkins University
8 IAS - Institut d'astrophysique spatiale
9 JPL - Jet Propulsion Laboratory
10 Cahill Center for Astronomy and Astrophysics
11 UT - Université de Toulouse
12 CESR - Centre d'étude spatiale des rayonnements
13 Physikalisches Institut, Universität zu Köln
14 LAM - Laboratoire d'Astrophysique de Marseille
15 LAOG - Laboratoire d'Astrophysique de Grenoble
16 Nicolaus Copernicus University [Toruń]
17 Institute of Physical Chemistry, Polish Academy of Sciences
18 TIFR - Tata Institute of Fundamental Research
19 University of Calgary
20 ESAC - European Space Astronomy Centre
21 MPE - Max-Planck-Institut für Extraterrestriche Physik
22 MPIfR - Max-Planck-Institut für Radioastronomie
23 Gemini telescope, Hilo
24 CAMK - Centrum Astronomiczne im. M. Kopernika, Warszawa
25 SRON - SRON Netherlands Institute for Space Research
26 Sterrewacht Leiden, Leiden University
27 DLR - Deutsches Zentrum für Luft- und Raumfahrt
28 OAA - INAF - Osservatorio Astrofisico di Arcetri
Benjamin Godard
- Fonction : Auteur
- PersonId : 1379031
- ORCID : 0000-0003-0060-8887
- IdRef : 144711060
A. Coutens
- Fonction : Auteur
- PersonId : 739468
- IdHAL : audrey-coutens
- ORCID : 0000-0003-1805-3920
- IdRef : 167181491
Emmanuel Dartois
- Fonction : Auteur
- PersonId : 741313
- IdHAL : emmanuel-dartois
- ORCID : 0000-0003-1197-7143
- IdRef : 136696686
Patrick Hennebelle
- Fonction : Auteur
- PersonId : 950937
- ORCID : 0000-0002-0472-7202
- IdRef : 161792030
Christine Joblin
- Fonction : Auteur
- PersonId : 21867
- IdHAL : christine-joblin
- ORCID : 0000-0003-1561-6118
- IdRef : 052563693
Résumé
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 km s-1 we estimate total column densities of N(OH+) >= 2.5 × 1014 cm-2, N(H2O+) ~6 × 1013 cm-2 and N(H3O+) ~4.0 × 1013 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.