  Unified models of Seyfert galaxies, based on viewing angles, successfully
explain the observed differences between type 1 and 2 Seyferts. The existence
of a range in accretion rates relative to the Eddington rate (from broad-line
Seyfert 1s to narrow-line Seyfert 1s or NLS1s) and the unification of Seyfert
galaxies imply that there must be type 2 counterparts of NLS1 galaxies i.e.,
Seyfert 2s with high accretion rate or small black hole mass. One such Seyfert
2, NGC5506, has already been unmasked based on near infra-red spectroscopy.
Here we confirm the above result, and present evidence for two additional type
2 counterparts of NLS1s based on XMM-Newton observations. The three AGNs
NGC7314, NGC7582 and NGC5506, with a type 1.9/2 optical spectrum, show
extremely rapid variability by factors >2.4, 1.3, and 1.7 in 200s, 350s and
300s, respectively, and steep 2-12 keV spectrum in their intrinsic X-ray
emission, characteristic of NLS1 galaxies. These observations establish the
obscured NLS1 galaxies as a subclass of Seyfert 2 galaxies.
