Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inferring the morphology of AGN torus using X-ray spectra: A reliability
  study   Numerous X-ray spectral models have been developed to model emission
reprocessed by the torus of an active galactic nucleus (AGN), e.g., UXCLUMPY,
CTORUS, and MYTORUS. They span a range of assumed torus geometries and
morphologies-some posit smooth gas distributions, and others posit
distributions of clouds. It is suspected that given the quality of currently
available data, certain model parameters, such as coronal power law photon
index and parameters determining the morphology of the AGN torus, may be poorly
constrained due to model degeneracies. In this work, we test the reliability of
these models in terms of recovery of parameters and the ability to discern the
morphology of the torus using XMM-Newton and NuSTAR spectral data. We perform
extensive simulations of X-ray spectra of Compton-thick AGNs under six X-ray
spectral models of the torus. We use Bayesian methods to investigate degeneracy
between model parameters, distinguish models and determine the dependence of
the parameter constraints on the instruments used. For typical exposure times
and fluxes for nearby Compton-thick AGN, we find that several parameters across
the models used here cannot be well constrained, e.g., the distribution of
clouds, the number of clouds in the radial direction, even when the applied
model is correct. We also find that Bayesian evidence values can robustly
distinguish between a correct and a wrong model only if there is sufficient
energy coverage and only if the intrinsic flux of the object is above a
particular value determined by the instrument combination and the model
considered.

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The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ph
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The categories of this paper are: math
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The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: nlin
32
The categories of this paper are: atom-ph