A NuSTAR census of coronal parameters in Seyfert galaxies
  We discuss the results on the hot corona parameters of Active Galactic Nuclei
that have been recently measured with NuSTAR. The values taken from the
literature of a sample of nineteen bright Seyfert galaxies are analysed. Aims.
The aim of this work is to look for correlations between coronal parameters,
such as the photon index and cutoff energy (when a phenomenological model is
adopted) or the optical depth and temperature (when a Comptonization model is
used), with other parameters of the systems like the black hole mass or the
Eddington ratio. We analysed the coronal parameters of the nineteen unobscured,
bright Seyfert galaxies that are present in the Swift-BAT 70 months catalogue
and that have been observed by NuSTAR, alone or simultaneously with others
X-rays observatories such as Swift, Suzaku or XMM-Newton. We found an
anti-correlation with a significance level > 98% between the coronal optical
depth and the coronal temperature of our sample. On the other hand, no
correlation between the above parameters and the black hole mass, the accretion
rate and the intrinsic spectral slope of the sources is found.
