**Table 2:** Main characteristics of the extragalactic sources.
Source name	Distance	1'' equiv.	Size of IR emitting region	IR luminosity
	Mpc	pc	arcsec	Lsol (log 10)
NGC 1068	15	73	<2.0	11.30 ^a
NGC 7172	35	168	<2.5	10.45 ^b
IRAS 19254-7245	240	1160		12.06 ^b
NGC 5506	24	117		10.36 ^a

^a

1999

^b

1997

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