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Several X-ray spectral models for tori in active galactic nuclei (AGNs) areavailable to constrain the properties of tori; however, the accuracy of thesemodels has not been verified. We recently construct a code for the torus usingGeant4, which can easily handle different geometries (Liu & Li 2014). Thus, weadopt the same assumptions as Murphy & Yaqoob (2009, hereafter MY09) andBrightman & Nandra (2011, hereafter BN11) and try to reproduce their spectra.As a result, we can reproduce well the reflection spectra and the strength ofthe Fe K$\alpha$ line of MY09, for both $\NH=10^{24}$ and $10^{25}$ cm$^{-2}$.However, we cannot produce the strong reflection component of BN11 in thelow-energy band. The origin of this component is the reflection from thevisible inner wall of the torus, and it should be very weak in the edge-ondirections under the geometry of BN11. Therefore, the behaviour of thereflection spectra in BN11 is not consistent with their geometry. The strengthof the Fe K$\alpha$ line of BN11 is also different from our results and theanalytical result in the optically thin case. The limitation of the spectralmodel will bias the parameters from X-ray spectral fitting.

A direct comparison of X-ray spectral models for tori in active galactic nuclei