  We present an ASCA observation of the NLSy1 Ark 564. The X-ray light curve
shows rapid variability, but no evidence for energy-dependence to these
variations, within the 0.6 -- 10 keV bandpass. A strong (EW ~ 70 eV) spectral
feature is observed close to 1 keV. A similar feature has been observed in TON
S180 (another NLSy1) but has not been observed in broad-line Seyfert galaxies.
The feature energy suggests a large contribution from Fe L-shell lines but its
intensity is difficult to explain in terms of emission and/or absorption from
photoionized gas. Models based on gas in thermal equilibrium with kT ~1 keV
provide an alternative parameterization of the soft spectrum. The latter may be
interpreted as the hot intercloud medium, undergoing rapid cooling and
producing strong Fe L-shell recombination lines. In all cases the physical
conditions are rather different from those observed in broad-line Seyferts. The
hard X-ray spectrum shows a broad and asymmetric Fe Kalpha line of large
equivalent width (~550 eV) which can be explained by a neutral disk viewed at ~
60 degrees to the line-of-sight, contrary to the hypothesis that NLSy1s are
viewed pole-on. The large EW of this line, the strong 1 keV emission and the
strong optical Fe emission lines all suggest an extreme Fe abundance in this
and perhaps other NLSy1s.
