Aperture synthesis observations of the circumnuclear ring in the Galactic center

Details Aperture synthesis observations of the circumnuclear ring in the Galactic center Aperture synthesis observations of the circumnuclear ring in the Galactic center

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318..124g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 318, July 1, 1987, p. 124-138. Research supported by Rockwell International

Astronomy and Astrophysics

Astronomy

176

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

Scientific paper

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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