  A sample of 22 narrow-line Seyfert 1 (NLS1) and 47 broad-line Seyfert 1
(BLS1) galaxies observed with Suzaku is used to examine the Fe K band
properties of each group. Three different models are used to examine the
presence of: narrow neutral Fe Ka line at 6.4 keV and ionised Fe xxv and Fe
xxvi emission lines (model A); a broad emission feature at around 6 - 7 keV
(model B); and an absorption edge at 7.1 keV (model C). In all three models,
the neutral Fe Ka line is weaker (lower luminosity and equivalent width) in
NLS1s than in BLS1s. Model (B) also finds a more significant broad component
(larger equivalent width) in NLS1s than in BLS1s. The feature does not appear
to be an artefact of steeper spectra in NLS1s, but rather an intrinsic property
of these sources. From model (C), the optical depth of the absorption edge
appears comparable between the two samples. When comparing the absorption with
the emission line properties, NLS1s seem to exhibit a lower ratio of
emission-to-absorption of iron than BLS1s, and than expected based on the
fluorescence yield. The observed differences may arise from different torus
geometries (e.g. larger opening angle in NLS1s), and/or additional sources of
Fe K emission and absorption in NLS1s beyond pure fluorescence (e.g.
originating in the disc and broad line region).
