X-Ray Spectral Model from Clumpy Torus and Its Application to Circinus
  Galaxy
  We construct an X-ray spectral model from the clumpy torus in an active
galactic nucleus (AGN), designated as "XCLUMPY", utilizing the Monte Carlo
simulation for Astrophysics and Cosmology framework (MONACO: Odaka et al. 2011,
2016). The adopted geometry of the torus is the same as that in Nenkova et al.
(2008), who assume a power law distribution of clumps in the radial direction
and a normal distribution in the elevation direction. We investigate the
dependence of the X-ray continuum and Fe K$\alpha$ fluorescence line profile on
the torus parameters. Our model is compared with other torus models: MYTorus
model (Murphy & Yaqoob 2009), Ikeda model (Ikeda et al. 2009), and CTorus model
(Liu & Li 2014). As an example, we also present the results applied to the
broadband X-ray spectra of the Circinus galaxy observed with XMM-Newton,
Suzaku, and NuSTAR. Our model can well reproduce the data, yielding a hydrogen
column density along the equatorial plane $N_{\mathrm{H}}^{\mathrm{Equ}} =
9.08_{-0.08}^{+0.14} \times 10^{24}$ cm$^{-2}$, a torus angular width $\sigma =
14.7_{-0.39}^{+0.44}$ degree, and a 2--10 keV luminosity $\log
L_{2-10}/\mathrm{erg \ s^{-1}} = 42.8$. These results are discussed in
comparison with the observations in other wavelengths.
