The distribution of water in the high-mass star-forming region NGC 6334 I

M. Emprechtinger 1 D. C. Lis 2 T. Bell 3 T. G. Phillips 2 P. Schilke 4, 5 C. Comito 5 R. Rolffs 6, 7 F. Van Der Tak 3 C. Ceccarelli 3 H. Aarts A. Bacmann 8, 9 Alain Baudry 9, 10 M. Benedettini 3 E. A. Bergin 11 G. Blake 12 A. Boogert 3 S. Bottinelli 13 S. Cabrit 14 P. Caselli 15 Alain Castets 3 E. Caux 16, 17 J. Cernicharo 18 C. Codella 3 A. Coutens 3 N. Crimier 3 K. Demyk 3 C. Dominik 19 P. Encrenaz 14 E. Falgarone 20 A. Fuente 3 M. Gerin 14, 20 P. Goldsmith 3 F. Helmich 3 P. Hennebelle 3 T. Henning 21 E. Herbst 22, 23 P. Hily-Blant 3 T. Jacq 9 C. Kahane 3 M. Kama 3 A. Klotz 13, 24 J. Kooi W. Langer 3 B. Lefloch 3 A. Loose S. Lord 3 A. Lorenzani 15 S. Maret 3 G. Melnick 3 D. Neufeld 3 B. Nisini 25 V. Ossenkopf 26, 27 S. Pacheco 3 L. Pagani 14 B. Parise 13, 28 Justin Pearson 3 C. Risacher 10 M. Salez 3 P. Saraceno 29 K. Schuster 3 J. Stutzki 4 X. Tielens 3 M. Van Der Wiel 3 C. Vastel 16, 17 S. Viti 3 Valentine Wakelam 30 A. Walters 3 F. Wyrowski 31 H. Yorke 3
9 FORMATION STELLAIRE 2010
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
30 AMOR 2010
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
Abstract : Aims: We present observations of twelve rotational transitions of H_216O, H_218O, and H_217O toward the massive star-forming region NGC 6334 I, carried out with Herschel/HIFI as part of the guaranteed time key program Chemical HErschel Surveys of Star forming regions (CHESS). We analyze these observations to obtain insights into physical processes in this region. Methods: We identify three main gas components (hot core, cold foreground, and outflow) in NGC 6334 I and derive the physical conditions in these components. Results: The hot core, identified by the emission in highly excited lines, shows a high excitation temperature of ~200 K, whereas water in the foreground component is predominantly in the ortho- and para- ground states. The abundance of water varies between 4 × 10-5 (outflow) and 10-8 (cold foreground gas). This variation is most likely due to the freeze-out of water molecules onto dust grains. The H_218O/H_217O abundance ratio is 3.2, which is consistent with the 18O/17O ratio determined from CO isotopologues. The ortho/para ratio in water appears to be relatively low (1.6±1) in the cold, quiescent gas, but close to the equilibrium value of three in the warmer outflow material (2.5±0.8). Herschel is an ESA space observatory with science instruments provided by European-led principal Investigator consortia and with important participation from NASA.Figures 1, 2 and 3 and Tables 2-4 (pages 5 to 6) are only available in electronic form at http://www.aanda.org
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https://hal.archives-ouvertes.fr/hal-00633423
Contributeur : Laurent Pagani <>
Soumis le : mardi 18 octobre 2011 - 14:49:31
Dernière modification le : mercredi 27 septembre 2017 - 01:21:53

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M. Emprechtinger, D. C. Lis, T. Bell, T. G. Phillips, P. Schilke, et al.. The distribution of water in the high-mass star-forming region NGC 6334 I. Astronomy and Astrophysics - A&A, EDP Sciences, 2010, 521, pp.L28. 〈10.1051/0004-6361/201015086〉. 〈hal-00633423〉

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