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arxiv 1907.13137 v1 pith:O46R5BIM submitted 2019-07-30 astro-ph.HE

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

classification astro-ph.HE
keywords modelspectrax-rayclumpyobscureractiveadditionalcompton-thick
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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Cited by 2 Pith papers

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  1. An intrinsic decline of accretion activity in GRS 1915+105

    astro-ph.HE 2026-07 conditional novelty 6.0

    Deep X-ray, radio, and infrared non-detections of GRS 1915+105 imply an intrinsic decline in accretion activity rather than enhanced obscuration, likely driven by 2023-2024 outflows clearing the inner disc.

  2. X-ray luminosity function of Compton-thick AGN in the early Universe (z > 3). Robustness and biases of the CTK population

    astro-ph.GA 2026-06 unverdicted novelty 5.0

    After applying IR-informed priors to X-ray NH posteriors in a sample of 811 high-z AGN, CTK sources comprise 17% of the population at 3<z<6 with no significant evolution.