Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiation-hydrodynamic simulations of thermally-driven disc winds in
  X-ray binaries: A direct comparison to GRO J1655-40   Essentially all low-mass X-ray binaries (LMXBs) in the soft state appear to
drive powerful equatorial disc winds. A simple mechanism for driving such
outflows involves X-ray heating of the top of the disc atmosphere to the
Compton temperature. Beyond the Compton radius, the thermal speed exceeds the
escape velocity, and mass loss is inevitable. Here, we present the first
coupled radiation-hydrodynamic simulation of such thermally-driven disc winds.
The main advance over previous modelling efforts is that the
frequency-dependent attenuation of the irradiating SED is taken into account.
We can therefore relax the approximation that the wind is optically thin
throughout which is unlikely to hold in the crucial acceleration zone of the
flow. The main remaining limitations of our simulations are connected to our
treatment of optically thick regions. Adopting parameters representative of the
wind-driving LMXB GRO~J1655-40, our radiation-hydrodynamic model yields a
mass-loss rate that is $\simeq5\times$ lower than that suggested by pure
hydrodynamic, optically thin models. This outflow rate still represents more
than twice the accretion rate and agrees well with the mass-loss rate inferred
from Chandra/HETG observations of GRO~J1655-40 at a time when the system had a
similar luminosity to that adopted in our simulations. The Fe XXV and Fe XXVI
Lyman $\rm{\alpha}~$ absorption line profiles observed in this state are
slightly stronger than those predicted by our simulations but the qualitative
agreement between observed and simulated outflow properties means that thermal
driving is a viable mechanism for powering the disc winds seen in soft-state
LMXBs.

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The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
1
The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph