Nitrogen hydrides in interstellar gas: Herschel/HIFI observations towards G10.6-0.4 (W31C)
- PERSSON, C. M.
- BLACK, J. H.
- CERNICHARO, J.
- GOICOECHEA, J. R.
- HASSEL, G. E.
- HERBST, E.
- GERIN, M.
- DE LUCA, M.
- BELL, T. A.
- COUTENS, A.
- FALGARONE, E.
- GOLDSMITH, P. F.
- GUPTA, H.
- KAZMIERCZAK, M.
- LIS, D. C.
- MOOKERJEA, B.
- NEUFELD, D. A.
- PEARSON, Justin
- PHILLIPS, T. G.
- SONNENTRUCKER, P.
- STUTZKI, J.
- VASTEL, C.
- YU, S.
- BOULANGER, F.
- DARTOIS, E.
- ENCRENAZ, P.
- GEBALLE, T. R.
- GIESEN, T.
- GODARD, B.
- GRY, C.
- HENNEBELLE, P.
- HILY-BLANT, Pierre
- JOBLIN, C.
- KOLOS, R.
- KRELOWSKI, J.
- MARTIN-PINTADO, J.
- MENTEN, K.
- MONJE, R.
- PERAULT, M.
- PLUME, R.
- SALEZ, M.
- SCHLEMMER, S.
- SCHMIDT, M.
- TEYSSIER, D.
- PERON, I.
- CAIS, Ph.
- CROS, A.
- RAVERA, L.
- MORRIS, P.
- LORD, S.
- PLANESAS, P.
- GAUFFRE, S.
DOIAbstract
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...
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