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L.J. Tacconi, R. Genzel, L.E. Tacconi-Garman, and J.F.
Max-Planck-Institut für extraterrestrische Physik, Postfach
1603, D-85740 Garching, Germany
Abstract: We have made a CO J=10 map of the Seyfert 1 galaxy,
NGC 7469 at 2.5 spatial resolution with the IRAM millimeter
interferometer. The high signal-to-noise ratio of these data and the
spectral resolution of 10 km s have allowed us to glean
kinematic details on spatial scales smaller than this (see
Figure). From model fits we find that the molecular gas comes from a
combination of a 1.5 radius circumnuclear ring and a central gas
concentration associated with the narrow line region (NLR). This
structure is very similar to the molecular structure seen in the Seyfert 2
galaxy NGC 1068, and is consistent with current unified schemes for
Seyfert galaxies. The velocity distribution has a slowly rising (not
solid-body) rotation curve. The gas lies in a plane with a low inclination
angle of 25. These kinematic parameters imply a dynamical
mass of 2.010 M in the central 5
(1.6 kpc), with the molecular mass dominating the dynamical mass.
The dynamical measurements thus allow a calibration of the H--to--CO
conversion factor in a Seyfert galaxy. We find that the
NGC 7469 conversion factor is 1.5 times the Galactic value.