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The basic unified model of active galactic nuclei (AGN) invokes ananisotropic obscuring structure, usually referred to as a torus, to explain AGNobscuration as an angle-dependent effect. We present a new grid of X-rayspectral templates based on radiative transfer calculations in neutral gas inan approximately toroidal geometry, appropriate for CCD-resolution X-rayspectra (FWHM > 130 eV). Fitting the templates to broadband X-ray spectra ofAGN provides constraints on two important geometrical parameters of the gasdistribution around the supermassive black hole: the average column density andthe covering factor. Compared to the currently available spectral templates,our model is more flexible, and capable of providing constraints on the maintorus parameters in a wider range of AGN. We demonstrate the application ofthis model using hard X-ray spectra from NuSTAR (3-79 keV) for four AGNcovering a variety of classifications: 3C 390.3, NGC 2110, IC 5063, and NGC7582. This small set of examples was chosen to illustrate the range of possibletorus configurations, from disk-like to sphere-like geometries with columndensities below, as well as above, the Compton-thick threshold. This diversityof torus properties challenges the simple assumption of a standardgeometrically and optically thick toroidal structure commonly invoked in thebasic form of the unified model of AGN. Finding broad consistency between theour constraints and those from infrared modeling, we discuss how the approachfrom the X-ray band complements similar measurements of AGN structures at otherwavelengths.

New Spectral Model for Constraining Torus Covering Factors from Broadband X-ray Spectra of Active Galactic Nuclei