Nitrogen hydrides in interstellar gas: Herschel/HIFI observations towards G10.6-0.4 (W31C)

C. M. Persson J. H. Black J. Cernicharo 1 J. R. Goicoechea 2 G. E. Hassel E. Herbst 3 M. Gerin 2, 4 M. De Luca 2 T. A. Bell A. Coutens 5 E. Falgarone 4 P. F. Goldsmith H. Gupta 6 M. Kazmierczak D. C. Lis 7 B. Mookerjea 8 D. A. Neufeld Justin Pearson 5 T. G. Phillips 7 P. Sonnentrucker J. Stutzki 5 C. Vastel 9 S. Yu F. Boulanger 10 E. Dartois 10 P. Encrenaz 2 T. R. Geballe T. Giesen B. Godard C. Gry 11 P. Hennebelle 5 P. Hily-Blant 5 C. Joblin 9 R. Kolos J. Krelowski J. Martin-Pintado 5 K. Menten R. Monje M. Perault 4 R. Plume M. Salez 5 S. Schlemmer M. Schmidt 12 D. Teyssier 13 I. Peron Ph. Cais 14, 15, 16, 17 A. Cros L. Ravera 9 P. Morris S. Lord 5 P. Planesas S. Gauffre 14, 15, 16, 17
Abstract : The HIFI instrument on board the Herschel Space Observatory has been used to observe interstellar nitrogen hydrides along the sight-line towards G10.6-0.4 in order to improve our understanding of the interstellar chemistry of nitrogen. We report observations of absorption in NH N=1-0, J=2-1 and ortho-NH2 1_1,1-0_0,0. We also observed ortho-NH3 1_0-0_0, and 2_0-1_0, para-NH3 2_1-1_1, and searched unsuccessfully for NH+. All detections show emission and absorption associated directly with the hot-core source itself as well as absorption by foreground material over a wide range of velocities. All spectra show similar, non-saturated, absorption features, which we attribute to diffuse molecular gas. Total column densities over the velocity range 11-54 km/s are estimated. The similar profiles suggest fairly uniform abundances relative to hydrogen, approximately 6*10^-9, 3*10^-9, and 3*10^-9 for NH, NH2, and NH3, respectively. These abundances are discussed with reference to models of gas-phase and surface chemistry.
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Contributeur : Marie-Paule Pomies <>
Soumis le : mardi 28 septembre 2010 - 12:04:05
Dernière modification le : vendredi 16 novembre 2018 - 02:05:37

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C. M. Persson, J. H. Black, J. Cernicharo, J. R. Goicoechea, G. E. Hassel, et al.. Nitrogen hydrides in interstellar gas: Herschel/HIFI observations towards G10.6-0.4 (W31C). Astronomy and Astrophysics - A&A, EDP Sciences, 2010, 521, pp.id.L45. 〈10.1051/0004-6361/201015105〉. 〈hal-00521649〉

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