Table 2: We compare the characteristic time-scales of gravity torques ( $T_{\rm grav}$ ), dynamical friction ( $T_{\rm df}$ ) and viscosity ( $T_{\rm visc}$ ) in the nuclear disks of NGC 4321 , NGC 4826, NGC 4579 and NGC 6951. Time-scales are given in units of rotation periods ( $T_{\rm rot}$ ).
Galaxy $T_{\rm grav}$ $T_{\rm df}$ $T_{\rm visc}$

( $T_{\rm rot}$ ) ( $T_{\rm rot}$ ) ( $T_{\rm rot}$ )

NGC 4321(r=200 pc) 8 30 20

NGC 4826(r=50 pc) 70 5 5

NGC 4579(r=200 pc) 8 30 22

NGC 6951(r=200 pc) 50-100 30 20

**Table 2:** We compare the characteristic time-scales of gravity torques ( $T_{\rm grav}$ ), dynamical friction ( $T_{\rm df}$ ) and viscosity ( $T_{\rm visc}$ ) in the nuclear disks of NGC 4321 , NGC 4826, NGC 4579 and NGC 6951. Time-scales are given in units of rotation periods ( $T_{\rm rot}$ ).
Galaxy	$T_{\rm grav}$	$T_{\rm df}$	$T_{\rm visc}$
	( $T_{\rm rot}$ )	( $T_{\rm rot}$ )	( $T_{\rm rot}$ )
NGC 4321(r=200 pc)	8	30	20
NGC 4826(r=50 pc)	70	5	5
NGC 4579(r=200 pc)	8	30	22
NGC 6951(r=200 pc)	50-100	30	20

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations
	3 Observational evidence of ongoing feeding
	4 Gravitational torques and AGN fueling
	5 Discussion and conclusions
	References