  Narrow Line Seyfert 1 galaxies (NLS1) are very interesting objects which
display peculiar properties when compared to their broad line analogues (BLS1).
Although well studied in many wavebands, their behaviour at >10 keV is poorly
studied and yet important to discriminate between models invoked to explain the
complexity observed in the X-ray band. Here we present for the first time high
energy observations (17-100 keV) of five NLS1 galaxies (3 bona fide and 2
candidates) detected by INTEGRAL/IBIS and provide for all of them a broad band
spectral analysis using data obtained by Swift/XRT below 10 keV. The combined
INTEGRAL spectrum is found to be steeper (Gamma=2.6 +/- 0.3) than those of
classical Seyfert 1 objects. This is due to a high energy cutoff, which is
required in some individual fits as in the average broad band spectrum. The
location of this high energy cutoff is at lower energies (E < 60 keV) than
typically seen in classical type 1 AGNs; a reflection component may also be
present but its value (R < 0.8) is compatible with those seen in standard
Seyfert 1s. We do not detect a soft excess in individual objects but only in
their cumulative spectrum. Our results suggest a lower plasma temperature for
the accreting plasma which combined to the high accretion rates (close to the
Eddington rate) point to different nuclear conditions in broad and narrow line
Seyfert 1 galaxies, likely related to different evolutionary stages.
