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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 anyfurther component up to ~40 keV. These spectral properties, together withsignificant variability on time-scales as short as weeks (as shown in a 2014Swift monitoring campaign), strongly support an unobscured line-of-sight forthis source. An alternative scenario in terms of a Compton-thick source isstrongly disfavoured, requiring an exceptional geometrical configuration,whereas a large fraction of the solid angle to the source is filled by a highlyionised gas, whose reprocessed emission would dominate the observed luminosity.Moreover, in this scenario the implied intrinsic X-ray luminosity of the sourcewould be much larger than the value predicted by other luminosity proxies, likethe [OIII]{\lambda}5007 emission line extinction-corrected luminosity.Therefore, we confirm with high confidence that NGC3147 is a true Type 2Seyfert galaxy, intrinsically characterised by the absence of a BLR.

The NuSTAR view of the true Type 2 Seyfert NGC3147