Persson, C. M. and Bell, T. A. and Lis, D. C. and Phillips, T. G. and Monje, R. and Morris, P. and Lord, S. (2010) Nitrogen hydrides in interstellar gas: Herschel/HIFI observations towards G10.6-0.4 (W31C). Astronomy and Astrophysics, 521 . Art. No. L45. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20110106-113627757
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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-NH_2 1_(1,1) ← 0_(0,0). We also observed ortho-NH_3 1_0 ← 0_0, and 2_0 ← 1_0, para-NH_3 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^(−1) 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, NH_2, and NH_3, respectively. These abundances are discussed with reference to models of gas-phase and surface chemistry.
|Additional Information:||© 2010 ESO. Received 31 May 2010, Accepted 6 July 2010, Published online 01 October 2010. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. Figures A.1 and A.2 (page 6) are only available in electronic form at http://www.aanda.org. HIFI has been designed and built by a consortium of institutes and university departments from across Europe, Canada and the United States under the leadership of SRON Netherlands Institute for Space Research, Groningen, The Netherlands and with major contributions from Germany, France and the US. Consortium members are: Canada: CSA, U. Waterloo; France: CESR, LAB, LERMA, IRAM; Germany: KOSMA, MPIfR, MPS; Ireland, NUI Maynooth; Italy: ASI, IFSI-INAF, Osservatorio Astrofisico di Arcetri- INAF; Netherlands: SRON, TUD; Poland: CAMK, CBK; Spain: Observatorio Astronmico Nacional (IGN), Centro de Astrobiologa (CSIC-INTA). Sweden: Chalmers University of Technology – MC2, RSS & GARD; Onsala Space Observatory; Swedish National Space Board, Stockholm University - Stockholm Observatory; Switzerland: ETH Zurich, FHNW; USA: Caltech, JPL, NHSC. C.P. and J.H.B. acknowledge generous support from the Swedish National Space Board. J.C. and J.R.G. thanks spanish MICINN for funding support under projects AYA2009-07304 and CSD2009-00038 M.S. acknowledges support from grant N 203 393334 from Polish MNiSW.|
|Subject Keywords:||astrochemistry – ISM: abundances – ISM: molecules – molecular processes – submillimetre: ISM – line: formation|
|Official Citation:||Nitrogen hydrides in interstellar gas - Herschel/HIFI observations towards G10.6-0.4 (W31C) C. M. Persson, J. H. Black, J. Cernicharo, J. R. Goicoechea, G. E. Hassel, E. Herbst, M. Gerin, M. De Luca, T. A. Bell, A. Coutens, E. Falgarone, P. F. Goldsmith, H. Gupta, M. Kaźmierczak, D. C. Lis, B. Mookerjea, D. A. Neufeld, J. Pearson, T. G. Phillips, P. Sonnentrucker, J. Stutzki, C. Vastel, S. Yu, F. Boulanger, E. Dartois, P. Encrenaz, T. R. Geballe, T. Giesen, B. Godard, C. Gry, P. Hennebelle, P. Hily-Blant, C. Joblin, R. Kołos, J. Krełowski, J. Martín-Pintado, K. Menten, R. Monje, M. Perault, R. Plume, M. Salez, S. Schlemmer, M. Schmidt, D. Teyssier, I. Péron, P. Cais, P. Gaufre, A. Cros, L. Ravera, P. Morris, S. Lord and P. Planesas A&A 521 L45 (2010) DOI: 10.1051/0004-6361/201015105|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Benjamin Perez|
|Deposited On:||06 Jan 2011 22:09|
|Last Modified:||26 Dec 2012 12:49|
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