Fe II velocity shifts in optical spectra of type 1 AGN
  Here we present a critical view of practical problems in the analysis of
optical Fe II emission lines of Type 1 AGN spectra. Besides the very complex
and unclear physical interpretation of the Fe II template shape, there are
other issues that might affect the results of Fe II contribution as well (like
the S/N, the AGN continuum component modelling, the complex shapes of other
broad and narrow emission lines that are blending in the same part of the
spectrum, the galactic host stellar component that could lead to mimicking of
the Fe II template shape on some parts of spectrum, etc.). In this paper we
concentrate particularly on the claims of possibility that in some objects Fe
II could be strongly shifted to the red. We examine the effects in the fitting
procedure that could artificially lead to such results.
