Abstract

Mass accretion is a fundamental process for the growth of supermassive black holes and activating the central engine. However, detailed accretion properties have not been observationally identified at the central ~10 parsec of active galaxies due to its compactness. Here we for the first time ever report the direct detection of parsec-scale (i.e., 0.01% scale of the host galaxy) dense molecular inflow in the active nucleus of the Circinus galaxy. Only a tiny portion (< 3%) of this inflow is consumed in the actual black hole growth but a bulk portion is blown-out by multiphase outflows. The dense gas disk is gravitationally unstable and drives accretion down to the central ~1 parsec, but another process will be required for the final subparsec-scale accretion. In addition, I will show preliminary results of our CO(2-1) survey toward 32 representative sample of nearby AGNs. Relations between circumnuclear disk-scale molecular gas properties and AGN properties (accretion rate, Eddington ratio, obscuration, etc) will be discussed in a statistical manner.