Odin observations of H2O in the Galactic Centre
Aa. Sandqvist(1) & P. Bergman(2) & J.H. Black(2) & R. Booth(2) & V. Buat(3) & C.L. Curry(4) & P. Encrenaz(5) & E. Falgarone(6) & P. Feldman(7) & M. Fich(4) & H.G. Floren(1) & U. Frisk(8) & M. Gerin(6) & E.M. Gregersen(9) & J. Harju(10) & T. Hasegawa(11) & Å . Hjalmarson(2) & L.E.B. Johansson(2) & S. Kwok(11) & B. Larsson(1) & A. Lecacheux(12) & T. Liljeström(13) & M. Lindqvist(2) & R. Liseau(1) & K. Mattila(10) & G.F. Mitchell(14) & L. Nordh(15) & M. Olberg(2) & A.O.H. Olofsson(2) & G. Olofsson(1) & L. Pagani(5) & R. Plume(11) & I. Ristorcelli(16) & F.v. Schéele(8) & G. Serra(16) & N.F.H. Tothill(14) & K. Volk(11) & C.D. Wilson(9) & A. Winnberg(2)
(1) Stockholm Observatory, SCFAB-AlbaNova, SE-106 91 Stockholm, Sweden, \emailaage@astro.su.se & Onsala Space Observatory, SE-439 92 Onsala, Sweden & Laboratoire d'Astronomie Spatiale, BP 8, FR-13376 Marseille CEDEX 12, France & Department of Physics, University of Waterloo, Waterloo, ON N2L 3G1, Canada & LERMA & FRE 2460 du CNRS, Observatoire de Paris, 61, ave de l'Observatoire,, FR-75014 Paris, France & LERMA & FRE 2460 du CNRS, Ecole Normale Supérieure, 24 rue Lhomond, FR-75005 Paris, France & Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada & Swedish Space Corporation, P. O. Box 4207, SE-171 04 Solna, Sweden & Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada & Observatory, P. O. Box 14, University of Helsinki, FI-00014 Helsinki, Finland & Department of Physics and Astronomy, University of Calgary, Calgary, AB T2N 1N4, Canada & LESIA, Observatoire de Paris, Section de Meudon, 5, Place Jules Janssen, FR-92195 Meudon CEDEX, France & Metsähovi Radio Observatory, Helsinki University of Technology, Otakaari 5A, FI-02150 Espoo, Finland & Department of Astronomy and Physics, Saint Mary's University, Halifax, NS B3H 3C3, Canada & Swedish National Space Board, Box 4006, SE-171 04 Solna, Sweden & CESR, 9 Avenue du Colonel Roche, B.P. 4346, FR-31029 Toulouse, France
Paper: A&A 402, L63 (2003)
Abstract:
The Odin satellite has been used to detect emission and
absorption in the 557-GHz H216O line in the Galactic Centre
towards the Sgr A* Circumnuclear Disk (CND), and the
Sgr A +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 Sgr A* CND. The
548-GHz H218O isotope line towards the CND is not detected
at the 0.02 K (rms) level.
Preprints available from the authors at aage@astro.su.se
,
or the raw TeX (no figures) if you click here.
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