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We present ALMA Band 6 $^{12}$CO(2--1) line and rest-frame 232GHz continuumobservations of the nearby Compton-thick Seyfert galaxy NGC5643 with angularresolutions 0.11-0.26arcsec (9-21pc). The CO(2--1) integrated line map revealsemission from the nuclear and circumnuclear region with a two-arm nuclearspiral extending 10arcsec on each side. The circumnuclear CO(2--1) kinematicscan be fitted with a rotating disk, although there are regions with largeresidual velocities and/or velocity dispersions. The CO(2--1) line profiles ofthese regions show two different velocity components. One is ascribed to thecircular component and the other to the interaction of the AGN outflow, astraced by the [O III]5007AA emission, with molecular gas in the disk a fewhundred parsecs from the AGN. On nuclear scales, we detected an inclinedCO(2--1) disk (diameter 26 pc, FWHM) oriented almost in a north-southdirection. The CO(2--1) nuclear kinematics can be fitted with a rotating diskwhich appears to be tilted with respect to the large scale disk. There arestrong non-circular motions in the central 0.2-0.3 arcsec with velocities of upto 110km/s. In the absence of a nuclear bar, these motions could be explainedas radial outflows in the nuclear disk. We estimate a total molecular gas massfor the nuclear disk of $M({\rm H}_2)=1.1\times 10^7\,M_\odot$ and an H$_2$column density toward the location of the AGN of $N({\rm H}_2)\sim 5 \times10^{23}\,{\rm cm}^{-2}$, for a standard CO-to-H$_2$ conversion factor. Weinterpret this nuclear molecular gas disk as the obscuring torus of NGC5643 aswell as the collimating structure of the ionization cone.

Resolving the nuclear obscuring disk in the Compton-thick Seyfert galaxy NGC5643 with ALMA