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Aperture synthesis observations of the circumnuclear ring in the Galactic center
Guesten, R.; Genzel, R.; Wright, M. C. H.; Jaffe, D. T.; Stutzki, J.; Harris, A. I.
AA(California, University, Berkeley), AB(California, University, Berkeley), AC(California, University, Berkeley), AD(California, University, Berkeley), AE(California, University, Berkeley)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 318, July 1, 1987, p. 124-138. Research supported by Rockwell International Corp. (ApJ Homepage)
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NASA/STI Keywords:
Astronomical Spectroscopy, Galactic Nuclei, Milky Way Galaxy, Molecular Gases, Neutral Gases, Synthetic Apertures, Absorption Spectra, Carbon Monoxide, Emission Spectra, Hydrocyanic Acid, Interstellar Gas, Radio Astronomy
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The authors report 88 GHz aperture synthesis observations of HCN J = 1-->0 emission and absorption in the central 5 pc of the Galaxy and single-dish measurements of HCN 1-->0 and CO J = 7-->6 line profiles at galactocentric radius R = 5.5 pc. The HCN synthesis data show a highly inclined, clumpy ring of molecular gas surrounding the ionized central 2 pc of the Galaxy. The ring is the inner edge of a thin disk extending in the HCN aperture synthesis data to about 5 pc and to >=7 pc in lower excitation lines. The molecular gas is dynamically coupled to ionized gas in the central cavity. The dominant large-scale velocity pattern of the majority of the molecular gas in the inner 5 pc is rotation. No overall radial motion greater than about 20 - 30 km s-1 is apparent. The neutral gas ring may represent a circumnuclear accretion disk which feeds interstellar matter into the central parsec.

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