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We report high resolution 12CO(J = 2-1), 13CO(J = 2-1), and 12CO(J = 3-2)imaging of the Seyfert 1/starburst ring galaxy NGC 1097 with the SubmillimeterArray to study the physical and kinematic properties of the 1-kpc circumnuclearstarburst ring. Individual star clusters as detected in the HST map of Pa_alphaline emission have been used to determine the star formation rate, and arecompared with the properties of the molecular gas. The molecular ring has beenresolved into individual clumps at GMA-scale of 200--300 pc in all three COlines. The intersection between the dust lanes and the starburst ring, which isassociated with orbit-crowding region, is resolved into twophysically/kinematically distinct features in the 1.5x1.0 (105x70 pc) 12CO(J =2-1) map. The clumps associated with the dust lanes have broader line width,higher surface gas density, and lower star formation rate, while the narrowline clumps associated with the starburst ring have opposite characteristics.Toomre-Q value under unity at the radius of the ring suggests that themolecular ring is gravitationally unstable to fragment at the scale of the GMA.The line widths and surface density of gas mass of the clumps show an azimuthalvariation related to the large scale dynamics. The star formation rate, on theother hand, is not significantly affected by the dynamics, but has acorrelation with the intensity ratio of 12CO (J = 3-2) and 12CO(J = 2-1), whichtraces the denser gas associated with star formation. Our resolved CO map,especially in the orbit-crowding region, for the first time demonstratesobservationally that the physical/kinematic properties of the GMAs are affectedby the large scale bar-potential dynamics in NGC 1097.

Physical properties of the circumnuclear starburst ring in the barred Galaxy NGC 1097