Volume 402, Number 3, May II 2003
First Science with the ODIN satellite
|Page(s)||L63 - L67|
|Published online||23 April 2003|
Letter to the Editor
Odin observations of H2O in the Galactic Centre*
Stockholm Observatory, SCFAB-AlbaNova, 106 91 Stockholm, Sweden
2 Onsala Space Observatory, 439 92 Onsala, Sweden
3 Laboratoire d'Astronomie Spatiale, BP 8, 13376 Marseille Cedex 12, France
4 Department of Physics, University of Waterloo, Waterloo, ON N2L 3G1, Canada
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, AB T2N 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: Aa. Sandqvist, email@example.com
Accepted: 11 February 2003
The Odin satellite has been used to detect emission and absorption in the 557-GHz HO line in the Galactic Centre towards the SgrA* Circumnuclear Disk (CND), and the SgrA +20 km s-1 and +50 km s-1 molecular clouds. Strong broad H2O emission lines have been detected in all three objects. Narrow H2O absorption lines are present at all three positions and originate along the lines of sight in the 3-kpc Spiral Arm, the -30 km s-1 Spiral Arm and the Local Sgr Spiral Arm. Broad H2O absorption lines near -130 km s-1 are also observed, originating in the Expanding Molecular Ring. A new molecular feature (the “High Positive Velocity Gas” - HPVG) has been identified in the positive velocity range of ≈+120 to +220 km s-1, seen definitely in absorption against the stronger dust continuum emission from the +20 km s-1 and +50 km s-1 clouds and possibly in emission towards the position of SgrA* CND. The 548-GHz HO isotope line towards the CND is not detected at the 0.02 K (rms) level.
Key words: Galaxy: center / ISM: individual objects: SgrA / ISM: molecules / ISM: clouds
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 was the industrial prime contractor and is also responsible for the satellite operation.
© ESO, 2003
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