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We present high angular resolution (0.5-2.0") observations of the mmcontinuum and the 12CO(J=3-2), 13CO(J=3-2), 13CO(J=2-1), C18O(J=2-1),HCN(J=3-2), HCO+(J=4-3) and HCO+(J=3-2) line emission in the circumnuclear disk(r=100pc) of the proto-typical Seyfert type-2 galaxy NGC1068, carried out withthe Submillimeter Array. We further include in our analysis new 13CO(J=1-0) andimproved 12CO(J=2-1) observations of NGC1068 at high angular resolution(1.0-2.0") and sensitivity, conducted with the IRAM Plateau de BureInterferometer. Based on the complex dynamics of the molecular gas emissionindicating non-circular motions in the central ~100pc, we propose a scenario inwhich part of the molecular gas in the circumnuclear disk of NGC1068 isradially blown outwards as a result of shocks. This shock scenario is furthersupported by quite warm (Tkin>=200K) and dense (nH2=10^4cm^-3) gas constrainedfrom the observed molecular line ratios. The HCN abundance in the circumnucleardisk is found to be [HCN]/[12CO]=10^-3.5. This is slightly higher than theabundances derived for galactic and extragalactic starforming/starburstingregions. This results lends further support to X-ray enhanced HCN formation inthe circumnuclear disk of NGC1068, as suggested by earlier studies. The HCO+abundance ([HCO+]/[12CO]=10^-5) appears to be somewhat lower than that ofgalactic and extragalactic starforming/starbursting regions. When trying to fitthe cm to mm continuum emission by different thermal and non-thermal processes,it appears that electron-scattered synchrotron emission yields the best resultswhile thermal free-free emission seems to over-predict the mm continuumemission.

SMA/PdBI multiple line observations of the nearby Seyfert2 galaxy NGC 1068: Shock related gas kinematics and heating in the central 100pc?