Volume 402, Number 3, May II 2003
First Science with the ODIN satellite
|Page(s)||L69 - L72|
|Published online||23 April 2003|
Letter to the Editor
First NH3 detection of the Orion Bar *
Stockholm Observatory, SCFAB, Roslagstullsbacken 21, 106 91 Stockholm, Sweden
2 Onsala Space Observatory, 439 92 Onsala, Sweden
3 Department of Physics, University of Waterloo, Waterloo, ON N2L 3G1, Canada
4 Laboratoire d'Astronomie Spatiale, BP 8, 13376 Marseille Cedex 12, France
5 LERMA & FRE 2460 du CNRS, Observatoire de Paris, 61 Av. de l'Observatoire, 75014 Paris, France
6 LERMA & FRE 2460 du CNRS, École Normale Supérieure, 24 rue Lhomond, 75005 Paris, France
7 Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada
8 Swedish Space Corporation, PO Box 4207, 171 04 Solna, Sweden
9 Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada
10 Observatory, PO Box 14, University of Helsinki, 00014 Helsinki, Finland
11 Department of Physics and Astronomy, University of Calgary, Calgary, ABT 2N 1N4, Canada
12 LESIA, Observatoire de Paris, Section de Meudon, 5 place Jules Janssen, 92195 Meudon Cedex, France
13 Metsähovi Radio Observatory, Helsinki University of Technology, Otakaari 5A, 02150 Espoo, Finland
14 Department of Astronomy and Physics, Saint Mary's University, Halifax, NS B3H 3C3, Canada
15 Swedish National Space Board, Box 4006, 171 04 Solna, Sweden
16 CESR, 9 avenue du Colonel Roche, BP 4346, 31029 Toulouse, France
Corresponding author: B. Larsson, email@example.com
Accepted: 1 February 2003
Odin has successfully observed three regions in the Orion A cloud, i.e. Ori KL, Ori S and the Orion Bar, in the 572.5 GHz rotational ground state line of ammonia, ortho-NH3 , and the result for the Orion Bar represents the first detection in an ammonia line. Several velocity components are present in the data. Specifically, the observed line profile from the Orion Bar can be decomposed into two components, which are in agreement with observations in high-J CO lines by Wilson et al. (2001). Using the source model for the Orion Bar by these authors, our Odin observation implies a total ammonia abundance of .
Key words: ISM: individual objects: Orion A / clouds / molecules / abundances / stars: formation
Based on observations with Odin, a Swedish-led satellite project funded jointly by the Swedish National Space Board (SNSB), the Canadian Space Agency (CSA), the National Technology Agency of Finland (Tekes) and Centre National d'Études Spatiales (CNES). The Swedish Space Corporation has been the industrial prime contractor.
© ESO, 2003
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