Hat creek aperture synthesis observations of the circum-nuclear ring in the Galactic Center Galactic Center

Details Hat creek aperture synthesis observations of the circum-nuclear ring in the Galactic Center Galactic Center Hat creek aperture synthesis observations of the circum-nuclear ring in the Galactic Center Galactic Center

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aipc..155..103g&link_type=abstract

AIP Conference Proceedings, Volume 155, pp. 103-105 (1987).

Physics

7

Scientific paper

We have made aperture synthesis observations of HCN J=1-0 emission and absorption in the central 5 pc of the Galaxy with 2` spatial and 4 km/s spectral resolution. The resulting maps show a clumpy ring of molecular gas which surrounds the ionized central 2 pc of the Galaxy. The molecular gas is dynamically coupled to the ionized gas in the central cavity; the western arc of the radio continuum appears to be the inner surface of the molecular ring ionized there by UV radiation from the center, the northern arm may be ionized gas falling from the ring into the Galactic center. The molecular ring is warped with an inclination which changes from 50 to 75 degrees. The velocity field of the molecular gas in the inner 5 pc is that of strongly perturbed rotation. No overall radial motion of the ring greater than 20 km s-1 is apparent. There is a large local velocity dispersion (FWHM=40-50 km s-1 in a 4` beam) which indicates that the present features have a short dynamic lifetime (<105 y). The disk's turbulence may be maintained by dissipation of rotational energy and by energy input from the center. The neutral gas ring may be an accretion disk from which interstellar material falls into the central pc of the Galaxy.

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