**Table 2:** Distance and BH mass estimates.
Object	Distance^a	$M_{\rm BH}$	Ref.^b
	(Mpc)	( $M_\odot$ )
NGC 4235	38.0	$4.8\times10^7$	(1)
NGC 4639	18.4	$7.1\times10^6$	(2)
NGC 5033	15.2	$2.8\times10^7$	(3)
NGC 5273	17.5	$1.6\times10^6$	(4)

^a Luminosity distances from NED; ^b references for the black hole masses: (1) Dong & de Robertis (2006); (2) Panessa et al. (2006); (3) Chiaberge et al. (2005); (4) Wu & Han (2001).

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