The NuSTAR view of the true Type 2 Seyfert NGC3147
  We present the first NuSTAR observation of a 'true' Type 2 Seyfert galaxy.
The 3-40 keV X-ray spectrum of NGC3147 is characterised by a simple power-law,
with a standard {\Gamma}~1.7 and an iron emission line, with no need for any
further component up to ~40 keV. These spectral properties, together with
significant variability on time-scales as short as weeks (as shown in a 2014
Swift monitoring campaign), strongly support an unobscured line-of-sight for
this source. An alternative scenario in terms of a Compton-thick source is
strongly disfavoured, requiring an exceptional geometrical configuration,
whereas a large fraction of the solid angle to the source is filled by a highly
ionised gas, whose reprocessed emission would dominate the observed luminosity.
Moreover, in this scenario the implied intrinsic X-ray luminosity of the source
would be much larger than the value predicted by other luminosity proxies, like
the [OIII]{\lambda}5007 emission line extinction-corrected luminosity.
Therefore, we confirm with high confidence that NGC3147 is a true Type 2
Seyfert galaxy, intrinsically characterised by the absence of a BLR.
