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NGC 1808 is a nearby barred starburst galaxy with an outflow from the nuclearregion. To study the inflow and outflow processes related to star formation anddynamical evolution of the galaxy, we have carried out \(^{12}\)CO (\(J=1-0\))mapping observations of the central \(r\sim4\) kpc of NGC 1808 using theAtacama Large Millimeter/submillimeter Array (ALMA). Four distinct componentsof molecular gas are revealed at high spatial resolution of 2\arcsec(\(\sim100\) pc): (1) a compact (\(r<200\) pc) circumnuclear disk (CND), (2)\(r\sim500\) pc ring, (3) gas-rich galactic bar, and (4) spiral arms. Basicgeometric and kinematic parameters are derived for the central 1-kpc regionusing tilted-ring modeling. The derived rotation curve reveals multiple masscomponents that include (1) a stellar bulge, (2) nuclear bar and molecular CND,and (3) unresolved massive (\(\sim10^7~M_\sun\)) core. Two systemic velocities,998 km s\(^{-1}\) for the CND and 964 km s\(^{-1}\) for the 500-pc ring, arerevealed, indicating a kinematic offset. The pattern speed of the primary bar,derived by using a cloud-orbit model, is \(56\pm11\) km s\(^{-1}\)kpc\(^{-1}\). Non-circular motions are detected associated with a nuclearspiral pattern and outflow in the central 1-kpc region. The ratio of the massoutflow rate to the star formation rate is \(\dot{M}_\mathrm{out}/SFR\sim0.2\)in the case of optically thin CO (1-0) emission in the outflow, suggesting lowefficiency of star formation quenching.

Gas Dynamics and Outflow in the Barred Starburst Galaxy NGC 1808 Revealed with ALMA