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 gch2o.tex A&A 402, L63 (2003)
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% A&A 402, L63 (2003)
\documentstyle[apjfonts, emulateapj]{article}
\begin{document}
\title{Odin observations of H$_{2}$O  in the Galactic Centre}

\author{Aa.\,Sandqvist\inst{1}
  \and P.\,Bergman\inst{2}
  \and J.H.\,Black\inst{2}
  \and R.\,Booth\inst{2}
  \and V.\,Buat\inst{3}
  \and C.L.\,Curry\inst{4}
  \and P.\,Encrenaz\inst{5}
  \and E.\,Falgarone\inst{6}
  \and P.\,Feldman\inst{7}
  \and M.\,Fich\inst{4}
  \and H.G.\,Floren\inst{1}
  \and U.\,Frisk\inst{8}
  \and M.\,Gerin\inst{6}
  \and E.M.\,Gregersen\inst{9}
  \and J.\,Harju\inst{10}
  \and T.\,Hasegawa\inst{11}
  \and \AA .\,Hjalmarson\inst{2}
  \and L.E.B.\,Johansson\inst{2}
  \and S.\,Kwok\inst{11}
  \and B.\,Larsson\inst{1}
  \and A.\,Lecacheux\inst{12}
  \and T.\,Liljestr\"om\inst{13}
  \and M.\,Lindqvist\inst{2}
  \and R.\,Liseau\inst{1}
  \and K.\,Mattila\inst{10}
  \and G.F.\,Mitchell\inst{14}
  \and L.\,Nordh\inst{15}
  \and M.\,Olberg\inst{2}
  \and A.O.H.\,Olofsson\inst{2}
  \and G.\,Olofsson\inst{1}
  \and L.\,Pagani\inst{5}
  \and R.\,Plume\inst{11}
  \and I.\,Ristorcelli\inst{16}
  \and F.v.\,Sch\'eele\inst{8}
  \and G.\,Serra\inst{16}
  \and N.F.H.\,Tothill\inst{14}
  \and K.\,Volk\inst{11}
  \and C.D.\,Wilson\inst{9}
  \and A.\,Winnberg\inst{2}
}

\institute{Stockholm Observatory, SCFAB-AlbaNova, SE-106 91 Stockholm,
  Sweden\\ \email{aage@astro.su.se}
  \and Onsala Space Observatory, SE-439 92 Onsala, Sweden
  \and Laboratoire d'Astronomie Spatiale, BP 8, FR-13376 Marseille
  CEDEX 12, France
  \and Department of Physics, University of Waterloo, Waterloo, ON N2L
  3G1, Canada
  \and LERMA \&\  FRE 2460 du CNRS, Observatoire de Paris, 61, ave de
  l'Observatoire,, FR-75014 Paris, France
  \and LERMA \&\  FRE 2460 du CNRS, Ecole Normale Sup\'erieure, 24 rue
  Lhomond, FR-75005 Paris, France
  \and Herzberg Institute of Astrophysics, 5071 West Saanich Road,
  Victoria, BC V9E 2E7, Canada
  \and Swedish Space Corporation, P. O. Box 4207, SE-171 04 Solna,
  Sweden
  \and Department of Physics and Astronomy, McMaster University,
  Hamilton, ON L8S 4M1, Canada
  \and Observatory, P. O. Box 14, University of Helsinki, FI-00014
  Helsinki, Finland
  \and Department of Physics and Astronomy, University of Calgary,
  Calgary, AB T2N 1N4, Canada
  \and LESIA, Observatoire de Paris, Section de Meudon, 5, Place Jules
  Janssen, FR-92195 Meudon CEDEX, France
  \and Mets\"ahovi Radio Observatory, Helsinki University of
  Technology, Otakaari 5A, FI-02150 Espoo, Finland
  \and Department of Astronomy and Physics, Saint Mary's University,
  Halifax, NS B3H 3C3, Canada
  \and Swedish National Space Board, Box 4006, SE-171 04 Solna,
  Sweden
  \and CESR, 9 Avenue du Colonel Roche, B.P. 4346, FR-31029 Toulouse,
France}

\begin{abstract}
The Odin satellite has been used to detect emission and
absorption in the 557-GHz H$_{2}^{16}$O  line in the Galactic Centre
towards the Sgr\,$\rm {A}^{*}$ Circumnuclear Disk (CND), and the
Sgr\,A +20 km\,s$^{-1}$ and +50 km\,s$^{-1}$ molecular
clouds. Strong broad H$_{2}$O emission
lines have been detected in all three objects. Narrow
H$_{2}$O 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
H$_{2}$O  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 $\approx$\  +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\,$\rm {A}^{*}$ CND. The
548-GHz H$_{2}^{18}$O  isotope line towards the CND is not detected
at the 0.02 K (rms) level.
\end{abstract}

\end{document}


--------------------------------------------------------------
Aage Sandqvist                       Tel. +46-8-55378511
Stockholm Observatory		     Fax. +46-8-55378510
SCFAB-AlbaNova
SE-106 91 Stockholm                  email: aage@astro.su.se
Sweden
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