# X-ray spectral and eclipsing model of the clumpy obscurer in active galactic nuclei

## TL;DR

This paper introduces a new unification model for the clumpy obscurer in active galactic nuclei, using Monte Carlo simulations to reproduce X-ray spectra and incorporating a Compton-thick reflector to fit NuSTAR data.

## Contribution

The authors developed a generalized Monte Carlo X-ray radiative transfer code and a unification model that accounts for complex scattering and reflection in AGN obscurers, enabling better spectral fits.

## Key findings

- Model spectra resemble the TORUS model due to strong Compton scattering.
- Adding a Compton-thick reflector improves fits to NuSTAR spectra.
- The model includes self-consistent infrared spectra for multi-wavelength analysis.

## Abstract

We present a unification model for a clumpy obscurer in active galactic nuclei (AGN) and investigate the properties of the resulting X-ray spectrum. Our model is constructed to reproduce the column density distribution of the AGN population and cloud eclipse events in terms of their angular sizes and frequency. We developed and release a generalised Monte Carlo X-ray radiative transfer code, XARS, to compute X-ray spectra of obscurer models. The geometry results in strong Compton scattering, causing soft photons to escape also along Compton-thick sight lines. This makes our model spectra very similar to the Brightman & Nandra TORUS model. However, only if we introduce an additional Compton-thick reflector near the corona, we achieve good fits to NuSTAR spectra. This additional component in our model can be interpreted as part of the dust-free broad-line region, an inner wall or rim, or a warped disk. It cannot be attributed to a simple disk because the reflector must simultaneously block the line of sight to the corona and reflect its radiation. We release our model as an Xspec table model and present corresponding CLUMPY infrared spectra, paving the way for self-consistent multi-wavelength analyses.