Physical parameters of the torus for the type 2 Seyfert IC 5063 from
  mid-IR and X-ray simultaneous spectral fitting
  In order to understand the diversity of classes observed in active galactic
nuclei (AGN), a geometrically and optically thick torus of gas and dust is
required to obscure the central engine depending on the line of sight to the
observer. We perform a simultaneous fitting of X-ray and mid-infrared (mid-IR)
spectra to investigate if the same structure could produce both emissions and,
if this the case, to obtain better constraints for the physical parameters of
the torus. In this case, we take advantage of the fact that both emissions show
important signatures of obscuration. We used the nearby type-2 active nucleus
IC 5063 as a test object. This object is ideal because of the wealth of
archival data including some high resolution data. It also has a relatively
high AGN luminosity that dominates at both X-ray and mid-IR frequencies. We use
high spectral resolution NuSTAR and IRS/Spitzer spectra. The AGN dusty models
used several physically motivated models. We found that the combination of the
smooth torus models at mid-IR by Fritz et al. (2006) and at X-rays by
Balokovi\'c et al. (2018), with the viewing and half-opening angles linked to
the same value, is the best choice to fit the spectra at both wavelengths. This
allows us to determine all the parameters of its torus. This result suggests
that the structure producing the continuum emission at mid-IR and the
reflection component at X-ray is the same. Therefore, we prove that this
technique can be used to infer the physical properties of the torus, at least
when AGN dust dominates the mid-IR emission and the reflection component is
significant at X-rays.
