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A&A Supplement Series, Vol. 126, December I 1997, 197-236

Received July 1, 1996; accepted February 24, 1997

Molecular gas in the Galactic center region

I. Data from a large scale tex2html_wrap_inline5219(J = 1 tex2html_wrap_inline5223 0) survey

G. Dahmentex2html_wrap5257, S. Hüttemeistertex2html_wrap5259, T.L. Wilsontex2html_wrap5261, R. Mauersbergertex2html_wrap5263, A. Linharttex2html_wrap5261, L. Bronfmantex2html_wrap5267, A.R. Tieftrunktex2html_wrap5269, K. Meyertex2html_wrap5261, W. Wiedenhövertex2html_wrap5261, T.M. Dametex2html_wrap5275, E.S. Palmertex2html_wrap5275, J. Maytex2html_wrap5267, J. Aparicitex2html_wrap5267, - F. Mac-Auliffetex2html_wrap5283

Send offprint request: S. Hüttemeister, Radioastrono-misches Institut, Universität Bonn, Germany.
tex2html_wrap604  Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
tex2html_wrap604  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, U.S.A.
tex2html_wrap606  Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago de Chile, Chile
tex2html_wrap608  Physics Department, Queen Mary & Westfield College, University of London, Mile End Road, London E1 4NS, UK
tex2html_wrap610  Radioastronomisches Institut, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
tex2html_wrap612  Steward Observatory, University of Arizona, Tucson, AZ 85721, U.S.A.
tex2html_wrap614  Swedish-ESO Submillimetre Telescope, European Southern Observatory, Casilla 19001, Santiago de Chile 19, Chile


A large scale survey of the Galactic center region in the tex2html_wrap_inline5225(tex2html_wrap_inline5227) transition is presented. This survey was obtained with the 1.2m Southern Millimeter-Wave Telescope (SMWT) at the Cerro Tololo Interamerican Observatory (CTIO) near La Serena, Chile. It covers the region tex2html_wrap_inline5229 and tex2html_wrap_inline5231 with a grid spacing of 9tex2html_wrap5305, i.e. the sampling is at full FWHP beamwidth. 357 positions were in total observed. After reviewing the instrumentation of the 1.2m SMWT, the observing techniques, and the methods used in the data reduction, the data of the survey are presented and morphologically described. In addition, data of the HNCO(50,5-40,4) line are presented, which was also included in the large bandwidth of the spectrometer. tex2html_wrap_inline5237 measurements performed for comparison purposes are presented and compared with other 12CO results. The maps of the tex2html_wrap_inline5241 survey demonstrate that there are great differences between the distribution of the optically thin tex2html_wrap_inline5241 emission and the usually optically thick tex2html_wrap_inline5237 emission.

keywords: telescopes -- surveys -- ISM: molecules, structure -- Galaxy: center -- radio lines: ISM

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