  The detection of X-ray narrow spectral features in the 5-7 keV band is
becoming increasingly more common in AGN observations, thanks to the
capabilities of current X-ray satellites. Such lines, both in emission and in
absorption, are mostly interpreted as arising from Iron atoms. When observed
with some displacement from their rest frame position, these lines carry the
potential to study the motion of circumnuclear gas in AGN, providing a
diagnostic of the effects of the gravitational field of the central black hole.
These narrow features have been often found with marginal statistical
significance. We are carrying on a systematic search for narrow features using
spectra of bright type 1 AGNs available in the XMM-Newton archive. The aim of
this work is to characterise the occurrence of the narrow features phenomenon
on a large sample of objects and to estimate the significance of the features
through Monte Carlo simulations. The project and preliminary results are
presented.
