We present a positive correlation between the mass of dense molecular gas ( M _ { dense } ) of \sim 100 pc scale circumnuclear disks ( CNDs ) and the black hole mass accretion rate ( \dot { M } _ { BH } ) in total 10 Seyfert galaxies , based on data compiled from the literature and an archive ( median aperture \theta _ { med } = 220 pc ) .
A typical M _ { dense } of CNDs is 10 ^ { 7 - 8 } M _ { \odot } , estimated from the luminosity of the dense gas tracer , the HCN ( 1 - 0 ) emission line .
Because dense molecular gas is the site of star formation , this correlation is virtually equivalent to the one between nuclear star formation rate and \dot { M } _ { BH } revealed previously .
Moreover , the M _ { dense } - \dot { M } _ { BH } correlation was tighter for CND-scale gas than for the gas on kpc or larger scales .
This indicates that CNDs likely play an important role in fueling black holes , whereas > kpc scale gas does not .
To demonstrate a possible approach for studying the CND-scale accretion process with the Atacama Large Millimeter/submillimeter Array ( ALMA ) , we used a mass accretion model where angular momentum loss due to supernova explosions is vital .
Based on the model prediction , we suggest that only the partial fraction of the mass accreted from the CND ( \dot { M } _ { acc } ) is consumed as \dot { M } _ { BH } .
However , \dot { M } _ { acc } agrees well with the total nuclear mass flow rate ( i.e. , \dot { M } _ { BH } + outflow rate ) .
Although these results are still tentative with large uncertainties , they support the view that star formation in CNDs can drive mass accretion onto supermassive black holes in Seyfert galaxies .