Mass accretion process onto central engine of active galactic nuclei

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Active Galactic Nuclei (AGNs) are powered by accretion matter onto Super Massive Black Hole (SMBH) in the galactic centers. To clarify the origin of accretion matter, physical condition, and angular momentum transfer mechanism, we observed molecular gas, dust, and plasma in 10-pc-scale vicinity of nearby AGNs. ALMA observations of CO (J=2-1) toward Cen A revealed (1) molecular gas disk that follows galactic rotation, (2) S-shaped filamentary gas stream toward 20-pc circumnuclear region, and (3) compact gas condensation which show rapid rotation within 20 pc. Since the rotation is similar to SMBH-bound stellar velocity field, we consider that these stars are formed in the condensed molecular gas and its dynamical friction would work for angular momentum transfer.We also found variation of maser emission synchronized with jet eruption in NGC 1052, identified radio component of gamma-ray flare source in 3C 84, etc.