Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A simple framework for modelling the dependence of bulk Comptonization
  by turbulence on accretion disc parameters   Warm Comptonization models for the soft X-ray excess in AGN do not
self-consistently explain the relationship between the Comptonizing medium and
the underlying accretion disc. Because of this, they cannot directly connect
the fitted Comptonization temperatures and optical depths to accretion disc
parameters. Since bulk velocities exceed thermal velocities in highly radiation
pressure dominated discs, in these systems bulk Comptonization by turbulence
may provide a physical basis in the disc itself for warm Comptonization models.
We model the dependence of bulk Comptonization on fundamental accretion disc
parameters, such as mass, luminosity, radius, spin, inner boundary condition,
and $\alpha$. In addition to constraining warm Comptonization models, our model
can help distinguish contributions from bulk Comptonization to the soft X-ray
excess from those due to other physical mechanisms, such as absorption and
reflection. By linking the time variability of bulk Comptonization to
fluctuations in the disc vertical structure due to magnetorotational
instability (MRI) turbulence, our results show that observations of the soft
X-ray excess can be used to study disc turbulence in the radiation pressure
dominated regime. Because our model connects bulk Comptonization to one
dimensional vertical structure temperature profiles in a physically intuitive
way, it will be useful for understanding this effect in future simulations run
in new regimes.

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The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph