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We present ALMA ~0.02"-resolution observations of the nucleus of the nearby(~14 Mpc) type-2 AGN NGC 1068 at HCN/HCO+/HNC J=3-2 lines, as well as at their13C isotopologue and vibrationally excited lines, to scrutinize themorphological/dynamical/chemical/physical properties of dense molecular gas inthe putative dusty molecular torus around a mass-accreting supermassive blackhole. We confirm almost east-west-oriented dense molecular gas emission bothmorphologically and dynamically, which we regard as coming from the torus.Bright emission is compact (<3 pc), and low-surface-brightness emission extendsout to 5-7 pc. These dense molecular gas properties are not symmetric betweenthe eastern and western torus. The HCN J=3-2 emission is stronger than the HCO+J=3-2 emission within the ~7 pc torus region, with an estimated dense molecularmass of (0.4-1.0)x10^6Msun. We interpret that HCN abundance is enhanced in thetorus. We detect signatures of outflowing dense molecular gas and avibrationally excited HCN J=3-2 line. Finally, we find that in the innermost(<1 pc) part of the torus, the dense molecular line rotation velocity, relativeto the systemic velocity, is the opposite of that in the outer (>2 pc) part, inboth the eastern and western torus. We prefer a scenario of counter-rotatingdense molecular gas with innermost almost-Keplerian-rotation and outer slowlyrotating (far below Keplerian) components. Our high-spatial-resolution densemolecular line data reveal that torus properties of NGC 1068 are much morecomplicated than the simple axi-symmetrically rotating torus picture in theclassical AGN unification paradigm.

ALMA 0.02"-resolution observations reveal HCN-abundance-enhanced counter-rotating and outflowing dense molecular gas at the NGC 1068 nucleus