  ASCA X-ray spectral analysis of the Seyfert 2 galaxy IRAS 04575-7537 is
presented. The main result is the presence of a significant iron edge at a rest
energy of 7.13^+0.21_-0.16 keV. The spectrum is flat (Gamma = 1.5) with a
substantial absorption Nh = 10^22 cm^-2 and does not require any reflection
component. There is also evidence of a narrow Fe Kalpha emission line, whose
rest energy (E = 6.35^+0.08_ -0.03 keV) and equivalent width (EW = 130+-50 eV)
suggest that the line originates from thick and cold matter. The intensity of
the line and, in particular, the depth of the iron edge are too strong to be
explained by simple transmission through the measured absorption column
density. This strongly suggests that a model more complex than a single
absorbed power law is needed. We propose an absorption model that we call
"leaky-total absorber" which can explain the spectrum flatness, the iron
emission line and the edge absorption feature and has also the advantage of
having a straightforward physical interpretation in the framework of Unified
models. In this model a thick absorber (Nh = 10^23 cm^-2), possibly associated
with broad line region (BLR) clouds, partially (36 %) covers the source
continuum with Gamma fixed to 1.9 as observed in Sey 1 galaxies. The escaping
radiation is then absorbed by a column density Nh = 10^22 cm^-2, which can be
attributed to the torus, seen through its rim.
