Title: Molecular gas in the Galactic center region. I. Data from a large scale C^{18}O(J = 1-->0) survey
Authors: Dahmen, G.; Huettemeister, S.; Wilson, T. L.; Mauersberger, R.; Linhart, A.; Bronfman, L.; Tieftrunk, A. R.; Meyer, K.; Wiedenhoever, W.; Dame, T. M.; Palmer, E. S.; May, J.; Aparici, J.; Mac-Auliffe, F.
Affiliation: AA( Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69, 53121 Bonn, Germany; and Physics Department, Queen Mary & Westfield College, University of London, Mile End Road, London E1 4NS, UK), AB(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, U.S.A.; and Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69, 53121 Bonn, Germany; and Radioastronomisches Institut, Universitat Bonn, Auf dem Hugel 71, 53121 Bonn, Germany), AC(Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69, 53121 Bonn, Germany), AD(Steward Observatory, University of Arizona, Tucson, AZ 85721, U.S.A.; and Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69, 53121 Bonn, Germany), AE(Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69, 53121 Bonn, Germany), AF(Departamento de Astronomia Universidad de Chile, Casilla 36-D, Santiago de Chile, Chile), AG(Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69, 53121 Bonn, Germany; and Swedish-ESO Submillimetre Telescope, European Southern Observatory, Casilla 19001, Santiago de Chile 19, Chile), AH(Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69, 53121 Bonn, Germany), AI(Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69, 53121 Bonn, Germany), AJ(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, U.S.A.), AK(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, U.S.A.), AL(Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago de Chile, Chile), AM(Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago de Chile, Chile), AN(Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago de Chile, Chile; and Swedish-ESO Submillimetre Telescope, European Southern Observatory, Casilla 19001, Santiago de Chile 19, Chile)
Journal: A & A Supplement series, Vol. 126, December I 1997, 197-236. (A&AS Homepage)
Publication Date: 12/1997
Origin: A&AS
A&A Keywords: TELESCOPES, SURVEYS, ISM: MOLECULES, STRUCTURE, GALAXY: CENTER, RADIO LINES: ISM
Bibliographic Code: 1997A&AS..126..197D

Abstract

A large scale survey of the Galactic center region in the C^{18}O(J = 1 --> 0) 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 -1.05d <= l <= +3.6d and -0.9d <= b <= +0.75d with a grid spacing of 9', 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(5_{0,5}-4_{0,4}) line are presented, which was also included in the large bandwidth of the spectrometer. ^{12}CO(1-0) measurements performed for comparison purposes are presented and compared with other ^{12}CO results. The maps of the C^{18}O(1-0) survey demonstrate that there are great differences between the distribution of the optically thin C^{18}O(1-0) emission and the usually optically thick ^{12}CO(1-0) emission.