The first hard X-ray spectral catalogue of Blazars observed by NuSTAR
  Blazars are a peculiar class of active galactic nuclei (AGNs) that enlighten
the sky at all wavelengths. The electromagnetic emission of these sources is
jet-dominated resulting in a spectral energy distribution (SED) that has a
typical double-humped shape. X-ray photons provide a wealth of information on
the physics of each source as in the X-ray band we can observe the tail of SED
first peak, the rise of the second one or the transition between the two.
NuSTAR, thanks to its capability of focusing X-rays up to 79 keV provides
broadband data particularly suitable to compute SEDs in a still poorly explored
part of the spectrum. In the context of the Open Universe initiative we
developed a dedicated pipeline, NuSTAR_Spectra, a shell-script that
automatically downloads data from the archive, generates scientific products
and carries out a complete spectral analysis. The script homogeneously extracts
high level scientific products for both NuSTAR's telescopes and the spectral
characterisation is performed testing two phenomenological models. The
corresponding X-ray properties are derived from the data best-fit and the SEDs
are also computed. The systematic processing of all blazar observations of the
NuSTAR public archive allowed us to release the first hard X-ray spectroscopic
catalogue of blazars (NuBlazar). The catalogue, updated to September 30th,
2021, includes 253 observations of 126 distinct blazars, 30 of which have been
multiply observed.
